mirror of https://github.com/go-gorm/gorm.git
113 lines
3.0 KiB
Go
113 lines
3.0 KiB
Go
package gorm
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import (
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"fmt"
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"strings"
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"reflect"
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)
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type mysql struct{}
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func (s *mysql) BinVar(i int) string {
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return "$$" // ?
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}
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func (s *mysql) SupportLastInsertId() bool {
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return true
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}
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func (s *mysql) HasTop() bool {
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return false
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}
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func (d *mysql) SqlTag(value reflect.Value, size int) 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, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
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return "int"
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case reflect.Int64, reflect.Uint64:
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return "bigint"
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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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} else {
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return "longtext"
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}
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case reflect.Struct:
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if value.Type() == timeType {
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return "datetime"
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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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} else {
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return "longblob"
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}
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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) PrimaryKeyTag(value reflect.Value, size int) string {
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suffix_str := " NOT NULL AUTO_INCREMENT PRIMARY KEY"
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switch value.Kind() {
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
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return "int" + suffix_str
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case reflect.Int64, reflect.Uint64:
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return "bigint" + suffix_str
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default:
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panic("Invalid primary key type")
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}
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}
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func (s *mysql) ReturningStr(key string) string {
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return ""
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}
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func (s *mysql) SelectFromDummyTable() string {
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return "FROM DUAL"
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}
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func (s *mysql) Quote(key string) string {
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return fmt.Sprintf("`%s`", key)
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}
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func (s *mysql) databaseName(scope *Scope) string {
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from := strings.Index(scope.db.parent.source, "/") + 1
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to := strings.Index(scope.db.parent.source, "?")
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if to == -1 {
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to = len(scope.db.parent.source)
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}
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return scope.db.parent.source[from:to]
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}
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func (s *mysql) HasTable(scope *Scope, tableName string) bool {
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var count int
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newScope := scope.New(nil)
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newScope.Raw(fmt.Sprintf("SELECT count(*) FROM INFORMATION_SCHEMA.tables where table_name = %v AND table_schema = %v",
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newScope.AddToVars(tableName),
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newScope.AddToVars(s.databaseName(scope))))
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newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
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return count > 0
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}
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func (s *mysql) HasColumn(scope *Scope, tableName string, columnName string) bool {
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var count int
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newScope := scope.New(nil)
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newScope.Raw(fmt.Sprintf("SELECT count(*) FROM information_schema.columns WHERE table_schema = %v AND table_name = %v AND column_name = %v",
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newScope.AddToVars(s.databaseName(scope)),
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newScope.AddToVars(tableName),
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newScope.AddToVars(columnName),
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))
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newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
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return count > 0
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}
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func (s *mysql) RemoveIndex(scope *Scope, indexName string) {
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scope.Raw(fmt.Sprintf("DROP INDEX %v ON %v", indexName, scope.QuotedTableName())).Exec()
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}
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