55 lines
1.5 KiB
Go
55 lines
1.5 KiB
Go
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package mysql
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// GetDefaultFieldLength is used for Interger Types, Flen is the display length.
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// Call this when no Flen assigned in ddl.
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// or column value is calculated from an expression.
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// For example: "select count(*) from t;", the column type is int64 and Flen in ResultField will be 21.
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// See: https://dev.mysql.com/doc/refman/5.7/en/storage-requirements.html
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func GetDefaultFieldLength(tp byte) int {
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switch tp {
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case TypeTiny:
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return 4
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case TypeShort:
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return 6
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case TypeInt24:
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return 9
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case TypeLong:
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return 11
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case TypeLonglong:
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return 21
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case TypeDecimal:
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// See: https://dev.mysql.com/doc/refman/5.7/en/fixed-point-types.html
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return 10
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case TypeBit, TypeBlob:
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return -1
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default:
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//TODO: add more types
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return -1
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}
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}
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// GetDefaultDecimal returns the default decimal length for column.
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func GetDefaultDecimal(tp byte) int {
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switch tp {
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case TypeDecimal:
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// See: https://dev.mysql.com/doc/refman/5.7/en/fixed-point-types.html
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return 0
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default:
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//TODO: add more types
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return -1
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}
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}
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