e5ca672742
For now, support is restricted to MySQL and PostgreSQL, while all other DBMS default to the old behavior. Signed-off-by: Stephan Peijnik <speijnik@anexia-it.com>
78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
package gorm
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import (
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"fmt"
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"reflect"
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"time"
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)
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type mysql struct {
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commonDialect
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}
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func (mysql) SqlTag(value reflect.Value, size int, autoIncrease bool) string {
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switch value.Kind() {
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case reflect.Bool:
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return "boolean"
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32:
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if autoIncrease {
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return "int AUTO_INCREMENT"
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}
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return "int"
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
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if autoIncrease {
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return "int unsigned AUTO_INCREMENT"
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}
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return "int unsigned"
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case reflect.Int64:
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if autoIncrease {
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return "bigint AUTO_INCREMENT"
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}
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return "bigint"
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case reflect.Uint64:
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if autoIncrease {
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return "bigint unsigned AUTO_INCREMENT"
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}
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return "bigint unsigned"
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case reflect.Float32, reflect.Float64:
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return "double"
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case reflect.String:
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if size > 0 && size < 65532 {
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return fmt.Sprintf("varchar(%d)", size)
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}
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return "longtext"
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case reflect.Struct:
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if _, ok := value.Interface().(time.Time); ok {
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return "timestamp NULL"
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}
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default:
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if _, ok := value.Interface().([]byte); ok {
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if size > 0 && size < 65532 {
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return fmt.Sprintf("varbinary(%d)", size)
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}
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return "longblob"
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}
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}
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panic(fmt.Sprintf("invalid sql type %s (%s) for mysql", value.Type().Name(), value.Kind().String()))
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}
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func (s mysql) HasForeignKey(scope *Scope, tableName string, fkName string) bool {
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var count int
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s.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE CONSTRAINT_SCHEMA=? AND TABLE_NAME=? AND CONSTRAINT_NAME=? AND CONSTRAINT_TYPE='FOREIGN KEY'",
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s.CurrentDatabase(scope), tableName, fkName)
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return count > 0
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}
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func (mysql) Quote(key string) string {
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return fmt.Sprintf("`%s`", key)
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}
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func (mysql) SelectFromDummyTable() string {
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return "FROM DUAL"
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}
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func (s mysql) CurrentDatabase(scope *Scope) (name string) {
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s.RawScanString(scope, &name, "SELECT DATABASE()")
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return
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}
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