mirror of https://github.com/go-gorm/gorm.git
131 lines
3.9 KiB
Go
131 lines
3.9 KiB
Go
package gorm
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import (
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"fmt"
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"reflect"
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"strconv"
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"time"
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)
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type commonDialect struct{}
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func (commonDialect) BindVar(i int) 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) DataTypeOf(field *StructField) string {
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var (
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size int
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dataValue = reflect.Indirect(reflect.New(field.Struct.Type))
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tagSettings = field.TagSettings
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)
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if num, ok := tagSettings["SIZE"]; ok {
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size, _ = strconv.Atoi(num)
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}
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switch dataValue.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 _, ok := tagSettings["AUTO_INCREMENT"]; ok {
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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 _, ok := tagSettings["AUTO_INCREMENT"]; ok {
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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 := dataValue.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 := dataValue.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", dataValue.Type().Name(), dataValue.Kind().String()))
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}
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func (c commonDialect) HasIndex(scope *Scope, tableName string, indexName string) bool {
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var (
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count int
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databaseName = c.currentDatabase(scope)
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)
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c.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.STATISTICS WHERE table_schema = ? AND table_name = ? AND index_name = ?", databaseName, tableName, indexName)
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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.Err(scope.NewDB().Exec(fmt.Sprintf("DROP INDEX %v ON %v", indexName, scope.QuotedTableName())).Error)
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}
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func (c commonDialect) HasTable(scope *Scope, tableName string) bool {
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var (
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count int
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databaseName = c.currentDatabase(scope)
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)
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c.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = ? AND table_name = ?", databaseName, tableName)
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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 (
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count int
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databaseName = c.currentDatabase(scope)
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)
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c.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = ? AND table_name = ? AND column_name = ?", databaseName, tableName, columnName)
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return count > 0
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}
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// RawScanInt scans the first column of the first row into the `scan' int pointer.
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// This function captures raw query errors and propagates them to the original scope.
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func (commonDialect) RawScanInt(scope *Scope, scanPtr *int, query string, args ...interface{}) {
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scope.Err(scope.NewDB().Raw(query, args...).Row().Scan(scanPtr))
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}
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// RawScanString scans the first column of the first row into the `scan' string pointer.
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// This function captures raw query errors and propagates them to the original scope.
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func (commonDialect) RawScanString(scope *Scope, scanPtr *string, query string, args ...interface{}) {
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scope.Err(scope.NewDB().Raw(query, args...).Row().Scan(scanPtr))
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}
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func (commonDialect) currentDatabase(scope *Scope) (name string) {
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scope.Err(scope.NewDB().Raw("SELECT DATABASE()").Row().Scan(&name))
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return
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}
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func (commonDialect) LimitAndOffsetSQL(limit, offset int) (sql string) {
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if limit >= 0 {
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sql += fmt.Sprintf(" LIMIT %d", limit)
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}
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if offset >= 0 {
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sql += fmt.Sprintf(" OFFSET %d", offset)
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}
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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) LastInsertIdReturningSuffix(tableName, columnName string) string {
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return ""
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}
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