228 lines
6.2 KiB
Go
228 lines
6.2 KiB
Go
package sqlite3
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import (
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"encoding/json"
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"errors"
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"math"
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"time"
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"github.com/ncruces/go-sqlite3/internal/util"
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)
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// Context is the context in which an SQL function executes.
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// An SQLite [Context] is in no way related to a Go [context.Context].
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//
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// https://sqlite.org/c3ref/context.html
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type Context struct {
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c *Conn
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handle uint32
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}
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// Conn returns the database connection of the
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// [Conn.CreateFunction] or [Conn.CreateWindowFunction]
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// routines that originally registered the application defined function.
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//
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// https://sqlite.org/c3ref/context_db_handle.html
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func (ctx Context) Conn() *Conn {
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return ctx.c
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}
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// SetAuxData saves metadata for argument n of the function.
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//
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// https://sqlite.org/c3ref/get_auxdata.html
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func (ctx Context) SetAuxData(n int, data any) {
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ptr := util.AddHandle(ctx.c.ctx, data)
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ctx.c.call("sqlite3_set_auxdata_go", uint64(ctx.handle), uint64(n), uint64(ptr))
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}
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// GetAuxData returns metadata for argument n of the function.
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//
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// https://sqlite.org/c3ref/get_auxdata.html
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func (ctx Context) GetAuxData(n int) any {
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ptr := uint32(ctx.c.call("sqlite3_get_auxdata", uint64(ctx.handle), uint64(n)))
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return util.GetHandle(ctx.c.ctx, ptr)
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}
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// ResultBool sets the result of the function to a bool.
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// SQLite does not have a separate boolean storage class.
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// Instead, boolean values are stored as integers 0 (false) and 1 (true).
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultBool(value bool) {
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var i int64
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if value {
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i = 1
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}
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ctx.ResultInt64(i)
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}
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// ResultInt sets the result of the function to an int.
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultInt(value int) {
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ctx.ResultInt64(int64(value))
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}
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// ResultInt64 sets the result of the function to an int64.
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultInt64(value int64) {
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ctx.c.call("sqlite3_result_int64",
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uint64(ctx.handle), uint64(value))
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}
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// ResultFloat sets the result of the function to a float64.
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultFloat(value float64) {
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ctx.c.call("sqlite3_result_double",
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uint64(ctx.handle), math.Float64bits(value))
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}
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// ResultText sets the result of the function to a string.
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultText(value string) {
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ptr := ctx.c.newString(value)
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ctx.c.call("sqlite3_result_text_go",
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uint64(ctx.handle), uint64(ptr), uint64(len(value)))
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}
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// ResultRawText sets the text result of the function to a []byte.
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultRawText(value []byte) {
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ptr := ctx.c.newBytes(value)
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ctx.c.call("sqlite3_result_text_go",
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uint64(ctx.handle), uint64(ptr), uint64(len(value)))
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}
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// ResultBlob sets the result of the function to a []byte.
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// Returning a nil slice is the same as calling [Context.ResultNull].
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultBlob(value []byte) {
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ptr := ctx.c.newBytes(value)
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ctx.c.call("sqlite3_result_blob_go",
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uint64(ctx.handle), uint64(ptr), uint64(len(value)))
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}
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// ResultZeroBlob sets the result of the function to a zero-filled, length n BLOB.
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultZeroBlob(n int64) {
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ctx.c.call("sqlite3_result_zeroblob64",
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uint64(ctx.handle), uint64(n))
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}
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// ResultNull sets the result of the function to NULL.
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultNull() {
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ctx.c.call("sqlite3_result_null",
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uint64(ctx.handle))
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}
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// ResultTime sets the result of the function to a [time.Time].
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultTime(value time.Time, format TimeFormat) {
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switch format {
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case TimeFormatDefault, TimeFormatAuto, time.RFC3339Nano:
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ctx.resultRFC3339Nano(value)
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return
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}
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switch v := format.Encode(value).(type) {
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case string:
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ctx.ResultText(v)
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case int64:
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ctx.ResultInt64(v)
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case float64:
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ctx.ResultFloat(v)
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default:
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panic(util.AssertErr())
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}
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}
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func (ctx Context) resultRFC3339Nano(value time.Time) {
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const maxlen = uint64(len(time.RFC3339Nano)) + 5
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ptr := ctx.c.new(maxlen)
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buf := util.View(ctx.c.mod, ptr, maxlen)
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buf = value.AppendFormat(buf[:0], time.RFC3339Nano)
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ctx.c.call("sqlite3_result_text_go",
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uint64(ctx.handle), uint64(ptr), uint64(len(buf)))
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}
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// ResultPointer sets the result of the function to NULL, just like [Context.ResultNull],
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// except that it also associates ptr with that NULL value such that it can be retrieved
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// within an application-defined SQL function using [Value.Pointer].
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultPointer(ptr any) {
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valPtr := util.AddHandle(ctx.c.ctx, ptr)
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ctx.c.call("sqlite3_result_pointer_go",
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uint64(ctx.handle), uint64(valPtr))
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}
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// ResultJSON sets the result of the function to the JSON encoding of value.
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultJSON(value any) {
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data, err := json.Marshal(value)
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if err != nil {
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ctx.ResultError(err)
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return // notest
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}
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ctx.ResultRawText(data)
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}
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// ResultValue sets the result of the function to a copy of [Value].
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultValue(value Value) {
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if value.c != ctx.c {
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ctx.ResultError(MISUSE)
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return
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}
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ctx.c.call("sqlite3_result_value",
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uint64(ctx.handle), uint64(value.handle))
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}
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// ResultError sets the result of the function an error.
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//
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// https://sqlite.org/c3ref/result_blob.html
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func (ctx Context) ResultError(err error) {
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if errors.Is(err, NOMEM) {
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ctx.c.call("sqlite3_result_error_nomem", uint64(ctx.handle))
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return
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}
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if errors.Is(err, TOOBIG) {
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ctx.c.call("sqlite3_result_error_toobig", uint64(ctx.handle))
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return
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}
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msg, code := errorCode(err, _OK)
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if msg != "" {
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defer ctx.c.arena.mark()()
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ptr := ctx.c.arena.string(msg)
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ctx.c.call("sqlite3_result_error",
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uint64(ctx.handle), uint64(ptr), uint64(len(msg)))
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}
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if code != _OK {
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ctx.c.call("sqlite3_result_error_code",
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uint64(ctx.handle), uint64(code))
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}
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}
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// VTabNoChange may return true if a column is being fetched as part
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// of an update during which the column value will not change.
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//
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// https://sqlite.org/c3ref/vtab_nochange.html
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func (ctx Context) VTabNoChange() bool {
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r := ctx.c.call("sqlite3_vtab_nochange", uint64(ctx.handle))
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return r != 0
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}
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