mirror of https://github.com/go-gorm/gorm.git
102 lines
2.8 KiB
Go
102 lines
2.8 KiB
Go
package gorm
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import (
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"fmt"
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"reflect"
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"strings"
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"time"
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)
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type commonDialect struct{}
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func (commonDialect) BinVar(i int) string {
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return "$$" // ?
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}
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func (commonDialect) SupportLastInsertId() bool {
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return true
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}
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func (commonDialect) HasTop() bool {
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return false
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}
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func (commonDialect) 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, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
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if autoIncrease {
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return "INTEGER AUTO_INCREMENT"
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}
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return "INTEGER"
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case reflect.Int64, reflect.Uint64:
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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.Float32, reflect.Float64:
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return "FLOAT"
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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 "VARCHAR(65532)"
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case reflect.Struct:
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if _, ok := value.Interface().(time.Time); ok {
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return "TIMESTAMP"
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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("BINARY(%d)", size)
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}
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return "BINARY(65532)"
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}
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}
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panic(fmt.Sprintf("invalid sql type %s (%s) for commonDialect", value.Type().Name(), value.Kind().String()))
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}
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func (commonDialect) ReturningStr(tableName, key string) string {
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return ""
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}
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func (commonDialect) SelectFromDummyTable() string {
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return ""
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}
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func (commonDialect) Quote(key string) string {
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return fmt.Sprintf(`"%s"`, key)
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}
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func (commonDialect) databaseName(scope *Scope) string {
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from := strings.LastIndex(scope.db.parent.source, "/") + 1
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to := strings.LastIndex(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 (c commonDialect) HasTable(scope *Scope, tableName string) bool {
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var count int
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scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE table_name = ? AND table_schema = ?", tableName, c.databaseName(scope)).Row().Scan(&count)
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return count > 0
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}
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func (c commonDialect) HasColumn(scope *Scope, tableName string, columnName string) bool {
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var count int
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scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = ? AND table_name = ? AND column_name = ?", c.databaseName(scope), tableName, columnName).Row().Scan(&count)
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return count > 0
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}
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func (commonDialect) HasIndex(scope *Scope, tableName string, indexName string) bool {
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var count int
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scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.STATISTICS where table_name = ? AND index_name = ?", tableName, indexName).Row().Scan(&count)
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return count > 0
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}
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func (commonDialect) RemoveIndex(scope *Scope, indexName string) {
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scope.NewDB().Exec(fmt.Sprintf("DROP INDEX %v ON %v", indexName, scope.QuotedTableName()))
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}
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