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migrator.go
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migrator.go
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package mysql
import (
"database/sql"
"fmt"
"strings"
"gorm.io/gorm"
"gorm.io/gorm/clause"
"gorm.io/gorm/migrator"
"gorm.io/gorm/schema"
)
type Migrator struct {
migrator.Migrator
Dialector
}
func (m Migrator) FullDataTypeOf(field *schema.Field) clause.Expr {
expr := m.Migrator.FullDataTypeOf(field)
if value, ok := field.TagSettings["COMMENT"]; ok {
expr.SQL += " COMMENT " + m.Dialector.Explain("?", value)
}
return expr
}
func (m Migrator) AlterColumn(value interface{}, field string) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
if field := stmt.Schema.LookUpField(field); field != nil {
return m.DB.Exec(
"ALTER TABLE ? MODIFY COLUMN ? ?",
clause.Table{Name: stmt.Table}, clause.Column{Name: field.DBName}, m.FullDataTypeOf(field),
).Error
}
return fmt.Errorf("failed to look up field with name: %s", field)
})
}
func (m Migrator) RenameColumn(value interface{}, oldName, newName string) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
if !m.Dialector.DontSupportRenameColumn {
return m.Migrator.RenameColumn(value, oldName, newName)
}
var field *schema.Field
if f := stmt.Schema.LookUpField(oldName); f != nil {
oldName = f.DBName
field = f
}
if f := stmt.Schema.LookUpField(newName); f != nil {
newName = f.DBName
field = f
}
if field != nil {
return m.DB.Exec(
"ALTER TABLE ? CHANGE ? ? ?",
clause.Table{Name: stmt.Table}, clause.Column{Name: oldName},
clause.Column{Name: newName}, m.FullDataTypeOf(field),
).Error
}
return fmt.Errorf("failed to look up field with name: %s", newName)
})
}
func (m Migrator) RenameIndex(value interface{}, oldName, newName string) error {
if !m.Dialector.DontSupportRenameIndex {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
return m.DB.Exec(
"ALTER TABLE ? RENAME INDEX ? TO ?",
clause.Table{Name: stmt.Table}, clause.Column{Name: oldName}, clause.Column{Name: newName},
).Error
})
}
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
err := m.DropIndex(value, oldName)
if err != nil {
return err
}
if idx := stmt.Schema.LookIndex(newName); idx == nil {
if idx = stmt.Schema.LookIndex(oldName); idx != nil {
opts := m.BuildIndexOptions(idx.Fields, stmt)
values := []interface{}{clause.Column{Name: newName}, clause.Table{Name: stmt.Table}, opts}
createIndexSQL := "CREATE "
if idx.Class != "" {
createIndexSQL += idx.Class + " "
}
createIndexSQL += "INDEX ? ON ??"
if idx.Type != "" {
createIndexSQL += " USING " + idx.Type
}
return m.DB.Exec(createIndexSQL, values...).Error
}
}
return m.CreateIndex(value, newName)
})
}
func (m Migrator) DropTable(values ...interface{}) error {
values = m.ReorderModels(values, false)
return m.DB.Connection(func(tx *gorm.DB) error {
tx.Exec("SET FOREIGN_KEY_CHECKS = 0;")
for i := len(values) - 1; i >= 0; i-- {
if err := m.RunWithValue(values[i], func(stmt *gorm.Statement) error {
return tx.Exec("DROP TABLE IF EXISTS ? CASCADE", clause.Table{Name: stmt.Table}).Error
}); err != nil {
return err
}
}
return tx.Exec("SET FOREIGN_KEY_CHECKS = 1;").Error
})
}
func (m Migrator) DropConstraint(value interface{}, name string) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
constraint, chk, table := m.GuessConstraintAndTable(stmt, name)
if chk != nil {
return m.DB.Exec("ALTER TABLE ? DROP CHECK ?", clause.Table{Name: stmt.Table}, clause.Column{Name: chk.Name}).Error
}
if constraint != nil {
name = constraint.Name
}
return m.DB.Exec(
"ALTER TABLE ? DROP FOREIGN KEY ?", clause.Table{Name: table}, clause.Column{Name: name},
).Error
})
}
// ColumnTypes column types return columnTypes,error
func (m Migrator) ColumnTypes(value interface{}) ([]gorm.ColumnType, error) {
columnTypes := make([]gorm.ColumnType, 0)
err := m.RunWithValue(value, func(stmt *gorm.Statement) error {
var (
currentDatabase = m.DB.Migrator().CurrentDatabase()
columnTypeSQL = "SELECT column_name, column_default, is_nullable = 'YES', data_type, character_maximum_length, column_type, column_key, extra, column_comment, numeric_precision, numeric_scale "
rows, err = m.DB.Session(&gorm.Session{}).Table(stmt.Table).Limit(1).Rows()
)
if err != nil {
return err
}
defer func() {
err = rows.Close()
}()
rawColumnTypes, err := rows.ColumnTypes()
if !m.DisableDatetimePrecision {
columnTypeSQL += ", datetime_precision "
}
columnTypeSQL += "FROM information_schema.columns WHERE table_schema = ? AND table_name = ? ORDER BY ORDINAL_POSITION"
columns, rowErr := m.DB.Raw(columnTypeSQL, currentDatabase, stmt.Table).Rows()
if rowErr != nil {
return rowErr
}
defer columns.Close()
for columns.Next() {
var (
column migrator.ColumnType
datetimePrecision sql.NullInt64
extraValue sql.NullString
columnKey sql.NullString
values = []interface{}{
&column.NameValue, &column.DefaultValueValue, &column.NullableValue, &column.DataTypeValue, &column.LengthValue, &column.ColumnTypeValue, &columnKey, &extraValue, &column.CommentValue, &column.DecimalSizeValue, &column.ScaleValue,
}
)
if !m.DisableDatetimePrecision {
values = append(values, &datetimePrecision)
}
if scanErr := columns.Scan(values...); scanErr != nil {
return scanErr
}
column.PrimaryKeyValue = sql.NullBool{Bool: false, Valid: true}
column.UniqueValue = sql.NullBool{Bool: false, Valid: true}
switch columnKey.String {
case "PRI":
column.PrimaryKeyValue = sql.NullBool{Bool: true, Valid: true}
case "UNI":
column.UniqueValue = sql.NullBool{Bool: true, Valid: true}
}
if strings.Contains(extraValue.String, "auto_increment") {
column.AutoIncrementValue = sql.NullBool{Bool: true, Valid: true}
}
if datetimePrecision.Valid {
column.DecimalSizeValue = datetimePrecision
}
for _, c := range rawColumnTypes {
if c.Name() == column.NameValue.String {
column.SQLColumnType = c
break
}
}
columnTypes = append(columnTypes, column)
}
return nil
})
return columnTypes, err
}
func (m Migrator) CurrentDatabase() (name string) {
baseName := m.Migrator.CurrentDatabase()
m.DB.Raw(
"SELECT SCHEMA_NAME from Information_schema.SCHEMATA where SCHEMA_NAME LIKE ? ORDER BY SCHEMA_NAME=? DESC limit 1",
baseName+"%", baseName).Scan(&name)
return
}
func (m Migrator) GetTables() (tableList []string, err error) {
err = m.DB.Raw("SELECT TABLE_NAME FROM information_schema.tables where TABLE_SCHEMA=?", m.CurrentDatabase()).
Scan(&tableList).Error
return
}