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column.go
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column.go
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// Copyright 2020-2021 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sql
import (
"fmt"
"reflect"
"strings"
)
// Column is the definition of a table column.
// As SQL:2016 puts it:
// A column is a named component of a table. It has a data type, a default,
// and a nullability characteristic.
type Column struct {
// Name is the name of the column.
Name string
// Type is the data type of the column.
Type Type
// Default contains the default value of the column or nil if it was not explicitly defined. A nil instance is valid, thus calls do not error.
Default *ColumnDefaultValue
// AutoIncrement is true if the column auto-increments.
AutoIncrement bool
// Nullable is true if the column can contain NULL values, or false
// otherwise.
Nullable bool
// Source is the name of the table this column came from.
Source string
// PrimaryKey is true if the column is part of the primary key for its table.
PrimaryKey bool
// Comment contains the string comment for this column.
Comment string
// Extra contains any additional information to put in the `extra` column under `information_schema.columns`.
Extra string
}
// Check ensures the value is correct for this column.
func (c *Column) Check(v interface{}) bool {
if v == nil {
return c.Nullable
}
_, err := c.Type.Convert(v)
return err == nil
}
// Equals checks whether two columns are equal.
func (c *Column) Equals(c2 *Column) bool {
return c.Name == c2.Name &&
c.Source == c2.Source &&
c.Nullable == c2.Nullable &&
reflect.DeepEqual(c.Default, c2.Default) &&
reflect.DeepEqual(c.Type, c2.Type)
}
func (c *Column) DebugString() string {
sb := strings.Builder{}
sb.WriteString("Name: ")
sb.WriteString(c.Name)
sb.WriteString(", ")
sb.WriteString("Source: ")
sb.WriteString(c.Source)
sb.WriteString(", ")
sb.WriteString("Type: ")
sb.WriteString(c.Type.String())
sb.WriteString(", ")
sb.WriteString("PrimaryKey: ")
sb.WriteString(fmt.Sprintf("%v", c.PrimaryKey))
sb.WriteString(", ")
sb.WriteString("Nullable: ")
sb.WriteString(fmt.Sprintf("%v", c.Nullable))
sb.WriteString(", ")
sb.WriteString("Comment: ")
sb.WriteString(c.Comment)
sb.WriteString(", ")
sb.WriteString("Default: ")
sb.WriteString(c.Default.String())
sb.WriteString(", ")
sb.WriteString("AutoIncrement: ")
sb.WriteString(fmt.Sprintf("%v", c.AutoIncrement))
sb.WriteString(", ")
sb.WriteString("Extra: ")
sb.WriteString(c.Extra)
return sb.String()
}