1215 lines
25 KiB
Go
1215 lines
25 KiB
Go
package bun
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import (
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"bytes"
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"context"
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"database/sql"
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"errors"
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"fmt"
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"strconv"
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"strings"
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"sync"
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"github.com/uptrace/bun/dialect"
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"github.com/uptrace/bun/dialect/feature"
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"github.com/uptrace/bun/internal"
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"github.com/uptrace/bun/schema"
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)
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type union struct {
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expr string
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query *SelectQuery
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}
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type SelectQuery struct {
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whereBaseQuery
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idxHintsQuery
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distinctOn []schema.QueryWithArgs
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joins []joinQuery
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group []schema.QueryWithArgs
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having []schema.QueryWithArgs
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order []schema.QueryWithArgs
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limit int32
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offset int32
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selFor schema.QueryWithArgs
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union []union
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}
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var _ Query = (*SelectQuery)(nil)
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func NewSelectQuery(db *DB) *SelectQuery {
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return &SelectQuery{
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whereBaseQuery: whereBaseQuery{
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baseQuery: baseQuery{
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db: db,
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conn: db.DB,
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},
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},
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}
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}
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func (q *SelectQuery) Conn(db IConn) *SelectQuery {
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q.setConn(db)
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return q
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}
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func (q *SelectQuery) Model(model interface{}) *SelectQuery {
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q.setModel(model)
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return q
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}
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func (q *SelectQuery) Err(err error) *SelectQuery {
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q.setErr(err)
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return q
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}
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// Apply calls the fn passing the SelectQuery as an argument.
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func (q *SelectQuery) Apply(fn func(*SelectQuery) *SelectQuery) *SelectQuery {
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if fn != nil {
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return fn(q)
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}
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return q
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}
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func (q *SelectQuery) With(name string, query schema.QueryAppender) *SelectQuery {
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q.addWith(name, query, false)
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return q
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}
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func (q *SelectQuery) WithRecursive(name string, query schema.QueryAppender) *SelectQuery {
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q.addWith(name, query, true)
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return q
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}
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func (q *SelectQuery) Distinct() *SelectQuery {
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q.distinctOn = make([]schema.QueryWithArgs, 0)
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return q
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}
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func (q *SelectQuery) DistinctOn(query string, args ...interface{}) *SelectQuery {
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q.distinctOn = append(q.distinctOn, schema.SafeQuery(query, args))
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return q
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}
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//------------------------------------------------------------------------------
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func (q *SelectQuery) Table(tables ...string) *SelectQuery {
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for _, table := range tables {
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q.addTable(schema.UnsafeIdent(table))
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}
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return q
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}
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func (q *SelectQuery) TableExpr(query string, args ...interface{}) *SelectQuery {
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q.addTable(schema.SafeQuery(query, args))
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return q
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}
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func (q *SelectQuery) ModelTableExpr(query string, args ...interface{}) *SelectQuery {
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q.modelTableName = schema.SafeQuery(query, args)
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return q
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}
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//------------------------------------------------------------------------------
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func (q *SelectQuery) Column(columns ...string) *SelectQuery {
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for _, column := range columns {
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q.addColumn(schema.UnsafeIdent(column))
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}
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return q
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}
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func (q *SelectQuery) ColumnExpr(query string, args ...interface{}) *SelectQuery {
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q.addColumn(schema.SafeQuery(query, args))
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return q
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}
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func (q *SelectQuery) ExcludeColumn(columns ...string) *SelectQuery {
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q.excludeColumn(columns)
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return q
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}
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//------------------------------------------------------------------------------
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func (q *SelectQuery) WherePK(cols ...string) *SelectQuery {
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q.addWhereCols(cols)
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return q
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}
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func (q *SelectQuery) Where(query string, args ...interface{}) *SelectQuery {
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q.addWhere(schema.SafeQueryWithSep(query, args, " AND "))
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return q
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}
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func (q *SelectQuery) WhereOr(query string, args ...interface{}) *SelectQuery {
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q.addWhere(schema.SafeQueryWithSep(query, args, " OR "))
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return q
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}
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func (q *SelectQuery) WhereGroup(sep string, fn func(*SelectQuery) *SelectQuery) *SelectQuery {
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saved := q.where
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q.where = nil
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q = fn(q)
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where := q.where
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q.where = saved
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q.addWhereGroup(sep, where)
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return q
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}
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func (q *SelectQuery) WhereDeleted() *SelectQuery {
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q.whereDeleted()
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return q
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}
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func (q *SelectQuery) WhereAllWithDeleted() *SelectQuery {
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q.whereAllWithDeleted()
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return q
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}
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//------------------------------------------------------------------------------
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func (q *SelectQuery) UseIndex(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addUseIndex(indexes...)
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}
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return q
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}
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func (q *SelectQuery) UseIndexForJoin(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addUseIndexForJoin(indexes...)
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}
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return q
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}
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func (q *SelectQuery) UseIndexForOrderBy(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addUseIndexForOrderBy(indexes...)
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}
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return q
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}
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func (q *SelectQuery) UseIndexForGroupBy(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addUseIndexForGroupBy(indexes...)
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}
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return q
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}
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func (q *SelectQuery) IgnoreIndex(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addIgnoreIndex(indexes...)
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}
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return q
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}
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func (q *SelectQuery) IgnoreIndexForJoin(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addIgnoreIndexForJoin(indexes...)
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}
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return q
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}
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func (q *SelectQuery) IgnoreIndexForOrderBy(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addIgnoreIndexForOrderBy(indexes...)
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}
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return q
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}
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func (q *SelectQuery) IgnoreIndexForGroupBy(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addIgnoreIndexForGroupBy(indexes...)
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}
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return q
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}
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func (q *SelectQuery) ForceIndex(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addForceIndex(indexes...)
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}
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return q
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}
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func (q *SelectQuery) ForceIndexForJoin(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addForceIndexForJoin(indexes...)
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}
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return q
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}
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func (q *SelectQuery) ForceIndexForOrderBy(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addForceIndexForOrderBy(indexes...)
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}
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return q
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}
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func (q *SelectQuery) ForceIndexForGroupBy(indexes ...string) *SelectQuery {
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if q.db.dialect.Name() == dialect.MySQL {
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q.addForceIndexForGroupBy(indexes...)
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}
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return q
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}
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//------------------------------------------------------------------------------
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func (q *SelectQuery) Group(columns ...string) *SelectQuery {
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for _, column := range columns {
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q.group = append(q.group, schema.UnsafeIdent(column))
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}
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return q
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}
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func (q *SelectQuery) GroupExpr(group string, args ...interface{}) *SelectQuery {
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q.group = append(q.group, schema.SafeQuery(group, args))
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return q
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}
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func (q *SelectQuery) Having(having string, args ...interface{}) *SelectQuery {
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q.having = append(q.having, schema.SafeQuery(having, args))
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return q
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}
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func (q *SelectQuery) Order(orders ...string) *SelectQuery {
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for _, order := range orders {
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if order == "" {
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continue
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}
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index := strings.IndexByte(order, ' ')
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if index == -1 {
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q.order = append(q.order, schema.UnsafeIdent(order))
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continue
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}
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field := order[:index]
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sort := order[index+1:]
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switch strings.ToUpper(sort) {
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case "ASC", "DESC", "ASC NULLS FIRST", "DESC NULLS FIRST",
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"ASC NULLS LAST", "DESC NULLS LAST":
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q.order = append(q.order, schema.SafeQuery("? ?", []interface{}{
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Ident(field),
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Safe(sort),
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}))
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default:
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q.order = append(q.order, schema.UnsafeIdent(order))
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}
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}
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return q
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}
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func (q *SelectQuery) OrderExpr(query string, args ...interface{}) *SelectQuery {
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q.order = append(q.order, schema.SafeQuery(query, args))
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return q
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}
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func (q *SelectQuery) Limit(n int) *SelectQuery {
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q.limit = int32(n)
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return q
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}
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func (q *SelectQuery) Offset(n int) *SelectQuery {
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q.offset = int32(n)
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return q
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}
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func (q *SelectQuery) For(s string, args ...interface{}) *SelectQuery {
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q.selFor = schema.SafeQuery(s, args)
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return q
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}
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//------------------------------------------------------------------------------
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func (q *SelectQuery) Union(other *SelectQuery) *SelectQuery {
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return q.addUnion(" UNION ", other)
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}
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func (q *SelectQuery) UnionAll(other *SelectQuery) *SelectQuery {
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return q.addUnion(" UNION ALL ", other)
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}
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func (q *SelectQuery) Intersect(other *SelectQuery) *SelectQuery {
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return q.addUnion(" INTERSECT ", other)
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}
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func (q *SelectQuery) IntersectAll(other *SelectQuery) *SelectQuery {
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return q.addUnion(" INTERSECT ALL ", other)
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}
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func (q *SelectQuery) Except(other *SelectQuery) *SelectQuery {
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return q.addUnion(" EXCEPT ", other)
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}
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func (q *SelectQuery) ExceptAll(other *SelectQuery) *SelectQuery {
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return q.addUnion(" EXCEPT ALL ", other)
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}
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func (q *SelectQuery) addUnion(expr string, other *SelectQuery) *SelectQuery {
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q.union = append(q.union, union{
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expr: expr,
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query: other,
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})
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return q
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}
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//------------------------------------------------------------------------------
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func (q *SelectQuery) Join(join string, args ...interface{}) *SelectQuery {
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q.joins = append(q.joins, joinQuery{
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join: schema.SafeQuery(join, args),
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})
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return q
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}
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func (q *SelectQuery) JoinOn(cond string, args ...interface{}) *SelectQuery {
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return q.joinOn(cond, args, " AND ")
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}
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func (q *SelectQuery) JoinOnOr(cond string, args ...interface{}) *SelectQuery {
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return q.joinOn(cond, args, " OR ")
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}
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func (q *SelectQuery) joinOn(cond string, args []interface{}, sep string) *SelectQuery {
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if len(q.joins) == 0 {
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q.err = errors.New("bun: query has no joins")
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return q
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}
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j := &q.joins[len(q.joins)-1]
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j.on = append(j.on, schema.SafeQueryWithSep(cond, args, sep))
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return q
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}
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//------------------------------------------------------------------------------
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// Relation adds a relation to the query.
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func (q *SelectQuery) Relation(name string, apply ...func(*SelectQuery) *SelectQuery) *SelectQuery {
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if len(apply) > 1 {
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panic("only one apply function is supported")
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}
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if q.tableModel == nil {
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q.setErr(errNilModel)
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return q
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}
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join := q.tableModel.join(name)
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if join == nil {
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q.setErr(fmt.Errorf("%s does not have relation=%q", q.table, name))
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return q
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}
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var apply1, apply2 func(*SelectQuery) *SelectQuery
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if len(join.Relation.Condition) > 0 {
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apply1 = func(q *SelectQuery) *SelectQuery {
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for _, opt := range join.Relation.Condition {
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q.addWhere(schema.SafeQueryWithSep(opt, nil, " AND "))
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}
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return q
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}
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}
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if len(apply) == 1 {
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apply2 = apply[0]
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}
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join.apply = func(q *SelectQuery) *SelectQuery {
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if apply1 != nil {
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q = apply1(q)
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}
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if apply2 != nil {
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q = apply2(q)
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}
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return q
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}
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return q
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}
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func (q *SelectQuery) forEachInlineRelJoin(fn func(*relationJoin) error) error {
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if q.tableModel == nil {
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return nil
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}
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return q._forEachInlineRelJoin(fn, q.tableModel.getJoins())
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}
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func (q *SelectQuery) _forEachInlineRelJoin(fn func(*relationJoin) error, joins []relationJoin) error {
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for i := range joins {
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j := &joins[i]
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switch j.Relation.Type {
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case schema.HasOneRelation, schema.BelongsToRelation:
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if err := fn(j); err != nil {
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return err
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}
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if err := q._forEachInlineRelJoin(fn, j.JoinModel.getJoins()); err != nil {
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return err
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}
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}
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}
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return nil
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}
|
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|
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func (q *SelectQuery) selectJoins(ctx context.Context, joins []relationJoin) error {
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for i := range joins {
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j := &joins[i]
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var err error
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switch j.Relation.Type {
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case schema.HasOneRelation, schema.BelongsToRelation:
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err = q.selectJoins(ctx, j.JoinModel.getJoins())
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case schema.HasManyRelation:
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err = j.selectMany(ctx, q.db.NewSelect().Conn(q.conn))
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case schema.ManyToManyRelation:
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err = j.selectM2M(ctx, q.db.NewSelect().Conn(q.conn))
|
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default:
|
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panic("not reached")
|
|
}
|
|
|
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if err != nil {
|
|
return err
|
|
}
|
|
}
|
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return nil
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
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func (q *SelectQuery) Operation() string {
|
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return "SELECT"
|
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}
|
|
|
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func (q *SelectQuery) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
|
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return q.appendQuery(fmter, b, false)
|
|
}
|
|
|
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func (q *SelectQuery) appendQuery(
|
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fmter schema.Formatter, b []byte, count bool,
|
|
) (_ []byte, err error) {
|
|
if q.err != nil {
|
|
return nil, q.err
|
|
}
|
|
|
|
fmter = formatterWithModel(fmter, q)
|
|
|
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cteCount := count && (len(q.group) > 0 || q.distinctOn != nil)
|
|
if cteCount {
|
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b = append(b, "WITH _count_wrapper AS ("...)
|
|
}
|
|
|
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if len(q.union) > 0 {
|
|
b = append(b, '(')
|
|
}
|
|
|
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b, err = q.appendWith(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
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b = append(b, "SELECT "...)
|
|
|
|
if len(q.distinctOn) > 0 {
|
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b = append(b, "DISTINCT ON ("...)
|
|
for i, app := range q.distinctOn {
|
|
if i > 0 {
|
|
b = append(b, ", "...)
|
|
}
|
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b, err = app.AppendQuery(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
b = append(b, ") "...)
|
|
} else if q.distinctOn != nil {
|
|
b = append(b, "DISTINCT "...)
|
|
}
|
|
|
|
if count && !cteCount {
|
|
b = append(b, "count(*)"...)
|
|
} else {
|
|
b, err = q.appendColumns(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
if q.hasTables() {
|
|
b, err = q.appendTables(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
b, err = q.appendIndexHints(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if err := q.forEachInlineRelJoin(func(j *relationJoin) error {
|
|
b = append(b, ' ')
|
|
b, err = j.appendHasOneJoin(fmter, b, q)
|
|
return err
|
|
}); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
for _, j := range q.joins {
|
|
b, err = j.AppendQuery(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
b, err = q.appendWhere(fmter, b, true)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(q.group) > 0 {
|
|
b = append(b, " GROUP BY "...)
|
|
for i, f := range q.group {
|
|
if i > 0 {
|
|
b = append(b, ", "...)
|
|
}
|
|
b, err = f.AppendQuery(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
|
|
if len(q.having) > 0 {
|
|
b = append(b, " HAVING "...)
|
|
for i, f := range q.having {
|
|
if i > 0 {
|
|
b = append(b, " AND "...)
|
|
}
|
|
b = append(b, '(')
|
|
b, err = f.AppendQuery(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
b = append(b, ')')
|
|
}
|
|
}
|
|
|
|
if !count {
|
|
b, err = q.appendOrder(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if fmter.Dialect().Features().Has(feature.OffsetFetch) {
|
|
if q.limit > 0 && q.offset > 0 {
|
|
b = append(b, " OFFSET "...)
|
|
b = strconv.AppendInt(b, int64(q.offset), 10)
|
|
b = append(b, " ROWS"...)
|
|
|
|
b = append(b, " FETCH NEXT "...)
|
|
b = strconv.AppendInt(b, int64(q.limit), 10)
|
|
b = append(b, " ROWS ONLY"...)
|
|
} else if q.limit > 0 {
|
|
b = append(b, " OFFSET 0 ROWS"...)
|
|
|
|
b = append(b, " FETCH NEXT "...)
|
|
b = strconv.AppendInt(b, int64(q.limit), 10)
|
|
b = append(b, " ROWS ONLY"...)
|
|
} else if q.offset > 0 {
|
|
b = append(b, " OFFSET "...)
|
|
b = strconv.AppendInt(b, int64(q.offset), 10)
|
|
b = append(b, " ROWS"...)
|
|
}
|
|
} else {
|
|
if q.limit > 0 {
|
|
b = append(b, " LIMIT "...)
|
|
b = strconv.AppendInt(b, int64(q.limit), 10)
|
|
}
|
|
if q.offset > 0 {
|
|
b = append(b, " OFFSET "...)
|
|
b = strconv.AppendInt(b, int64(q.offset), 10)
|
|
}
|
|
}
|
|
|
|
if !q.selFor.IsZero() {
|
|
b = append(b, " FOR "...)
|
|
b, err = q.selFor.AppendQuery(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
|
|
if len(q.union) > 0 {
|
|
b = append(b, ')')
|
|
|
|
for _, u := range q.union {
|
|
b = append(b, u.expr...)
|
|
b = append(b, '(')
|
|
b, err = u.query.AppendQuery(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
b = append(b, ')')
|
|
}
|
|
}
|
|
|
|
if cteCount {
|
|
b = append(b, ") SELECT count(*) FROM _count_wrapper"...)
|
|
}
|
|
|
|
return b, nil
|
|
}
|
|
|
|
func (q *SelectQuery) appendColumns(fmter schema.Formatter, b []byte) (_ []byte, err error) {
|
|
start := len(b)
|
|
|
|
switch {
|
|
case q.columns != nil:
|
|
for i, col := range q.columns {
|
|
if i > 0 {
|
|
b = append(b, ", "...)
|
|
}
|
|
|
|
if col.Args == nil && q.table != nil {
|
|
if field, ok := q.table.FieldMap[col.Query]; ok {
|
|
b = append(b, q.table.SQLAlias...)
|
|
b = append(b, '.')
|
|
b = append(b, field.SQLName...)
|
|
continue
|
|
}
|
|
}
|
|
|
|
b, err = col.AppendQuery(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
case q.table != nil:
|
|
if len(q.table.Fields) > 10 && fmter.IsNop() {
|
|
b = append(b, q.table.SQLAlias...)
|
|
b = append(b, '.')
|
|
b = fmter.Dialect().AppendString(b, fmt.Sprintf("%d columns", len(q.table.Fields)))
|
|
} else {
|
|
b = appendColumns(b, q.table.SQLAlias, q.table.Fields)
|
|
}
|
|
default:
|
|
b = append(b, '*')
|
|
}
|
|
|
|
if err := q.forEachInlineRelJoin(func(join *relationJoin) error {
|
|
if len(b) != start {
|
|
b = append(b, ", "...)
|
|
start = len(b)
|
|
}
|
|
|
|
b, err = q.appendInlineRelColumns(fmter, b, join)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
b = bytes.TrimSuffix(b, []byte(", "))
|
|
|
|
return b, nil
|
|
}
|
|
|
|
func (q *SelectQuery) appendInlineRelColumns(
|
|
fmter schema.Formatter, b []byte, join *relationJoin,
|
|
) (_ []byte, err error) {
|
|
join.applyTo(q)
|
|
|
|
if join.columns != nil {
|
|
table := join.JoinModel.Table()
|
|
for i, col := range join.columns {
|
|
if i > 0 {
|
|
b = append(b, ", "...)
|
|
}
|
|
|
|
if col.Args == nil {
|
|
if field, ok := table.FieldMap[col.Query]; ok {
|
|
b = join.appendAlias(fmter, b)
|
|
b = append(b, '.')
|
|
b = append(b, field.SQLName...)
|
|
b = append(b, " AS "...)
|
|
b = join.appendAliasColumn(fmter, b, field.Name)
|
|
continue
|
|
}
|
|
}
|
|
|
|
b, err = col.AppendQuery(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return b, nil
|
|
}
|
|
|
|
for i, field := range join.JoinModel.Table().Fields {
|
|
if i > 0 {
|
|
b = append(b, ", "...)
|
|
}
|
|
b = join.appendAlias(fmter, b)
|
|
b = append(b, '.')
|
|
b = append(b, field.SQLName...)
|
|
b = append(b, " AS "...)
|
|
b = join.appendAliasColumn(fmter, b, field.Name)
|
|
}
|
|
return b, nil
|
|
}
|
|
|
|
func (q *SelectQuery) appendTables(fmter schema.Formatter, b []byte) (_ []byte, err error) {
|
|
b = append(b, " FROM "...)
|
|
return q.appendTablesWithAlias(fmter, b)
|
|
}
|
|
|
|
func (q *SelectQuery) appendOrder(fmter schema.Formatter, b []byte) (_ []byte, err error) {
|
|
if len(q.order) > 0 {
|
|
b = append(b, " ORDER BY "...)
|
|
|
|
for i, f := range q.order {
|
|
if i > 0 {
|
|
b = append(b, ", "...)
|
|
}
|
|
b, err = f.AppendQuery(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return b, nil
|
|
}
|
|
return b, nil
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
func (q *SelectQuery) Rows(ctx context.Context) (*sql.Rows, error) {
|
|
if q.err != nil {
|
|
return nil, q.err
|
|
}
|
|
|
|
if err := q.beforeAppendModel(ctx, q); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
queryBytes, err := q.AppendQuery(q.db.fmter, q.db.makeQueryBytes())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
query := internal.String(queryBytes)
|
|
|
|
ctx, event := q.db.beforeQuery(ctx, q, query, nil, query, q.model)
|
|
rows, err := q.conn.QueryContext(ctx, query)
|
|
q.db.afterQuery(ctx, event, nil, err)
|
|
return rows, err
|
|
}
|
|
|
|
func (q *SelectQuery) Exec(ctx context.Context, dest ...interface{}) (res sql.Result, err error) {
|
|
if q.err != nil {
|
|
return nil, q.err
|
|
}
|
|
if err := q.beforeAppendModel(ctx, q); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
queryBytes, err := q.AppendQuery(q.db.fmter, q.db.makeQueryBytes())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
query := internal.String(queryBytes)
|
|
|
|
if len(dest) > 0 {
|
|
model, err := q.getModel(dest)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
res, err = q.scan(ctx, q, query, model, true)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
} else {
|
|
res, err = q.exec(ctx, q, query)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return res, nil
|
|
}
|
|
|
|
func (q *SelectQuery) Scan(ctx context.Context, dest ...interface{}) error {
|
|
if q.err != nil {
|
|
return q.err
|
|
}
|
|
|
|
model, err := q.getModel(dest)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if q.table != nil {
|
|
if err := q.beforeSelectHook(ctx); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if err := q.beforeAppendModel(ctx, q); err != nil {
|
|
return err
|
|
}
|
|
|
|
queryBytes, err := q.AppendQuery(q.db.fmter, q.db.makeQueryBytes())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
query := internal.String(queryBytes)
|
|
|
|
res, err := q.scan(ctx, q, query, model, true)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if n, _ := res.RowsAffected(); n > 0 {
|
|
if tableModel, ok := model.(TableModel); ok {
|
|
if err := q.selectJoins(ctx, tableModel.getJoins()); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
if q.table != nil {
|
|
if err := q.afterSelectHook(ctx); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (q *SelectQuery) beforeSelectHook(ctx context.Context) error {
|
|
if hook, ok := q.table.ZeroIface.(BeforeSelectHook); ok {
|
|
if err := hook.BeforeSelect(ctx, q); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (q *SelectQuery) afterSelectHook(ctx context.Context) error {
|
|
if hook, ok := q.table.ZeroIface.(AfterSelectHook); ok {
|
|
if err := hook.AfterSelect(ctx, q); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (q *SelectQuery) Count(ctx context.Context) (int, error) {
|
|
if q.err != nil {
|
|
return 0, q.err
|
|
}
|
|
|
|
qq := countQuery{q}
|
|
|
|
queryBytes, err := qq.AppendQuery(q.db.fmter, nil)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
query := internal.String(queryBytes)
|
|
ctx, event := q.db.beforeQuery(ctx, qq, query, nil, query, q.model)
|
|
|
|
var num int
|
|
err = q.conn.QueryRowContext(ctx, query).Scan(&num)
|
|
|
|
q.db.afterQuery(ctx, event, nil, err)
|
|
|
|
return num, err
|
|
}
|
|
|
|
func (q *SelectQuery) ScanAndCount(ctx context.Context, dest ...interface{}) (int, error) {
|
|
if _, ok := q.conn.(*DB); ok {
|
|
return q.scanAndCountConc(ctx, dest...)
|
|
}
|
|
return q.scanAndCountSeq(ctx, dest...)
|
|
}
|
|
|
|
func (q *SelectQuery) scanAndCountConc(ctx context.Context, dest ...interface{}) (int, error) {
|
|
var count int
|
|
var wg sync.WaitGroup
|
|
var mu sync.Mutex
|
|
var firstErr error
|
|
|
|
if q.limit >= 0 {
|
|
wg.Add(1)
|
|
go func() {
|
|
defer wg.Done()
|
|
|
|
if err := q.Scan(ctx, dest...); err != nil {
|
|
mu.Lock()
|
|
if firstErr == nil {
|
|
firstErr = err
|
|
}
|
|
mu.Unlock()
|
|
}
|
|
}()
|
|
}
|
|
|
|
wg.Add(1)
|
|
go func() {
|
|
defer wg.Done()
|
|
|
|
var err error
|
|
count, err = q.Count(ctx)
|
|
if err != nil {
|
|
mu.Lock()
|
|
if firstErr == nil {
|
|
firstErr = err
|
|
}
|
|
mu.Unlock()
|
|
}
|
|
}()
|
|
|
|
wg.Wait()
|
|
return count, firstErr
|
|
}
|
|
|
|
func (q *SelectQuery) scanAndCountSeq(ctx context.Context, dest ...interface{}) (int, error) {
|
|
var firstErr error
|
|
|
|
if q.limit >= 0 {
|
|
firstErr = q.Scan(ctx, dest...)
|
|
}
|
|
|
|
count, err := q.Count(ctx)
|
|
if err != nil && firstErr == nil {
|
|
firstErr = err
|
|
}
|
|
|
|
return count, firstErr
|
|
}
|
|
|
|
func (q *SelectQuery) Exists(ctx context.Context) (bool, error) {
|
|
if q.err != nil {
|
|
return false, q.err
|
|
}
|
|
|
|
if q.hasFeature(feature.SelectExists) {
|
|
return q.selectExists(ctx)
|
|
}
|
|
return q.whereExists(ctx)
|
|
}
|
|
|
|
func (q *SelectQuery) selectExists(ctx context.Context) (bool, error) {
|
|
qq := selectExistsQuery{q}
|
|
|
|
queryBytes, err := qq.AppendQuery(q.db.fmter, nil)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
query := internal.String(queryBytes)
|
|
ctx, event := q.db.beforeQuery(ctx, qq, query, nil, query, q.model)
|
|
|
|
var exists bool
|
|
err = q.conn.QueryRowContext(ctx, query).Scan(&exists)
|
|
|
|
q.db.afterQuery(ctx, event, nil, err)
|
|
|
|
return exists, err
|
|
}
|
|
|
|
func (q *SelectQuery) whereExists(ctx context.Context) (bool, error) {
|
|
qq := whereExistsQuery{q}
|
|
|
|
queryBytes, err := qq.AppendQuery(q.db.fmter, nil)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
query := internal.String(queryBytes)
|
|
res, err := q.exec(ctx, qq, query)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
n, err := res.RowsAffected()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
return n == 1, nil
|
|
}
|
|
|
|
func (q *SelectQuery) String() string {
|
|
buf, err := q.AppendQuery(q.db.Formatter(), nil)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
return string(buf)
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
func (q *SelectQuery) QueryBuilder() QueryBuilder {
|
|
return &selectQueryBuilder{q}
|
|
}
|
|
|
|
func (q *SelectQuery) ApplyQueryBuilder(fn func(QueryBuilder) QueryBuilder) *SelectQuery {
|
|
return fn(q.QueryBuilder()).Unwrap().(*SelectQuery)
|
|
}
|
|
|
|
type selectQueryBuilder struct {
|
|
*SelectQuery
|
|
}
|
|
|
|
func (q *selectQueryBuilder) WhereGroup(
|
|
sep string, fn func(QueryBuilder) QueryBuilder,
|
|
) QueryBuilder {
|
|
q.SelectQuery = q.SelectQuery.WhereGroup(sep, func(qs *SelectQuery) *SelectQuery {
|
|
return fn(q).(*selectQueryBuilder).SelectQuery
|
|
})
|
|
return q
|
|
}
|
|
|
|
func (q *selectQueryBuilder) Where(query string, args ...interface{}) QueryBuilder {
|
|
q.SelectQuery.Where(query, args...)
|
|
return q
|
|
}
|
|
|
|
func (q *selectQueryBuilder) WhereOr(query string, args ...interface{}) QueryBuilder {
|
|
q.SelectQuery.WhereOr(query, args...)
|
|
return q
|
|
}
|
|
|
|
func (q *selectQueryBuilder) WhereDeleted() QueryBuilder {
|
|
q.SelectQuery.WhereDeleted()
|
|
return q
|
|
}
|
|
|
|
func (q *selectQueryBuilder) WhereAllWithDeleted() QueryBuilder {
|
|
q.SelectQuery.WhereAllWithDeleted()
|
|
return q
|
|
}
|
|
|
|
func (q *selectQueryBuilder) WherePK(cols ...string) QueryBuilder {
|
|
q.SelectQuery.WherePK(cols...)
|
|
return q
|
|
}
|
|
|
|
func (q *selectQueryBuilder) Unwrap() interface{} {
|
|
return q.SelectQuery
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
type joinQuery struct {
|
|
join schema.QueryWithArgs
|
|
on []schema.QueryWithSep
|
|
}
|
|
|
|
func (j *joinQuery) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
|
|
b = append(b, ' ')
|
|
|
|
b, err = j.join.AppendQuery(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(j.on) > 0 {
|
|
b = append(b, " ON "...)
|
|
for i, on := range j.on {
|
|
if i > 0 {
|
|
b = append(b, on.Sep...)
|
|
}
|
|
|
|
b = append(b, '(')
|
|
b, err = on.AppendQuery(fmter, b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
b = append(b, ')')
|
|
}
|
|
}
|
|
|
|
return b, nil
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
type countQuery struct {
|
|
*SelectQuery
|
|
}
|
|
|
|
func (q countQuery) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
|
|
if q.err != nil {
|
|
return nil, q.err
|
|
}
|
|
return q.appendQuery(fmter, b, true)
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
type selectExistsQuery struct {
|
|
*SelectQuery
|
|
}
|
|
|
|
func (q selectExistsQuery) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
|
|
if q.err != nil {
|
|
return nil, q.err
|
|
}
|
|
|
|
b = append(b, "SELECT EXISTS ("...)
|
|
|
|
b, err = q.appendQuery(fmter, b, false)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
b = append(b, ")"...)
|
|
|
|
return b, nil
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
type whereExistsQuery struct {
|
|
*SelectQuery
|
|
}
|
|
|
|
func (q whereExistsQuery) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
|
|
if q.err != nil {
|
|
return nil, q.err
|
|
}
|
|
|
|
b = append(b, "SELECT 1 WHERE EXISTS ("...)
|
|
|
|
b, err = q.appendQuery(fmter, b, false)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
b = append(b, ")"...)
|
|
|
|
return b, nil
|
|
}
|