mirror of https://github.com/go-gorm/gorm.git
81 lines
2.2 KiB
Go
81 lines
2.2 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 mssql struct {
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commonDialect
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}
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func (mssql) HasTop() bool {
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return true
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}
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func (mssql) 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 "bit"
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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 "int IDENTITY(1,1)"
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}
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return "int"
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case reflect.Int64, reflect.Uint64:
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if autoIncrease {
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return "bigint IDENTITY(1,1)"
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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("nvarchar(%d)", size)
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}
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return "text"
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case reflect.Struct:
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if _, ok := value.Interface().(time.Time); ok {
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return "datetime2"
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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("varchar(%d)", size)
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}
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return "text"
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}
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}
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panic(fmt.Sprintf("invalid sql type %s (%s) for mssql", value.Type().Name(), value.Kind().String()))
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}
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func (s mssql) HasTable(scope *Scope, tableName string) bool {
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var (
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count int
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databaseName = s.CurrentDatabase(scope)
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)
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scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_name = ? AND table_catalog = ?", tableName, databaseName).Row().Scan(&count)
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return count > 0
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}
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func (s mssql) HasColumn(scope *Scope, tableName string, columnName string) bool {
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var (
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count int
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databaseName = s.CurrentDatabase(scope)
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)
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scope.NewDB().Raw("SELECT count(*) FROM information_schema.columns WHERE table_catalog = ? AND table_name = ? AND column_name = ?", databaseName, tableName, columnName).Row().Scan(&count)
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return count > 0
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}
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func (mssql) 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 sys.indexes WHERE name=? AND object_id=OBJECT_ID(?)", indexName, tableName).Row().Scan(&count)
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return count > 0
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}
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func (mssql) CurrentDatabase(scope *Scope) (name string) {
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scope.Err(scope.NewDB().Raw("SELECT DB_NAME() AS [Current Database]").Row().Scan(&name))
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return
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}
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