mirror of https://github.com/go-gorm/gorm.git
148 lines
3.8 KiB
Go
148 lines
3.8 KiB
Go
package mssql
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import (
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"fmt"
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"reflect"
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"strconv"
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"strings"
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"time"
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_ "github.com/denisenkom/go-mssqldb"
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"github.com/jinzhu/gorm"
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)
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func init() {
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gorm.RegisterDialect("mssql", &mssql{})
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}
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type mssql struct {
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db gorm.SQLCommon
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gorm.DefaultForeignKeyNamer
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}
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func (mssql) GetName() string {
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return "mssql"
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}
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func (s *mssql) SetDB(db gorm.SQLCommon) {
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s.db = db
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}
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func (mssql) BindVar(i int) string {
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return "$$" // ?
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}
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func (mssql) Quote(key string) string {
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return fmt.Sprintf(`"%s"`, key)
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}
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func (s *mssql) DataTypeOf(field *gorm.StructField) string {
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var dataValue, sqlType, size, additionalType = gorm.ParseFieldStructForDialect(field, s)
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if sqlType == "" {
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switch dataValue.Kind() {
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case reflect.Bool:
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sqlType = "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 _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
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sqlType = "int IDENTITY(1,1)"
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} else {
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sqlType = "int"
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}
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case reflect.Int64, reflect.Uint64:
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if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
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sqlType = "bigint IDENTITY(1,1)"
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} else {
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sqlType = "bigint"
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}
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case reflect.Float32, reflect.Float64:
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sqlType = "float"
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case reflect.String:
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if size > 0 && size < 8000 {
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sqlType = fmt.Sprintf("nvarchar(%d)", size)
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} else {
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sqlType = "nvarchar(max)"
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}
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case reflect.Struct:
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if _, ok := dataValue.Interface().(time.Time); ok {
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sqlType = "datetime2"
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}
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default:
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if gorm.IsByteArrayOrSlice(dataValue) {
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if size > 0 && size < 8000 {
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sqlType = fmt.Sprintf("varbinary(%d)", size)
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} else {
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sqlType = "varbinary(max)"
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}
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}
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}
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}
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if sqlType == "" {
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panic(fmt.Sprintf("invalid sql type %s (%s) for mssql", dataValue.Type().Name(), dataValue.Kind().String()))
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}
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if strings.TrimSpace(additionalType) == "" {
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return sqlType
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}
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return fmt.Sprintf("%v %v", sqlType, additionalType)
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}
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func (s mssql) HasIndex(tableName string, indexName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM sys.indexes WHERE name=? AND object_id=OBJECT_ID(?)", indexName, tableName).Scan(&count)
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return count > 0
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}
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func (s mssql) RemoveIndex(tableName string, indexName string) error {
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_, err := s.db.Exec(fmt.Sprintf("DROP INDEX %v ON %v", indexName, s.Quote(tableName)))
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return err
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}
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func (s mssql) HasForeignKey(tableName string, foreignKeyName string) bool {
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return false
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}
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func (s mssql) HasTable(tableName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_name = ? AND table_catalog = ?", tableName, s.CurrentDatabase()).Scan(&count)
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return count > 0
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}
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func (s mssql) HasColumn(tableName string, columnName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM information_schema.columns WHERE table_catalog = ? AND table_name = ? AND column_name = ?", s.CurrentDatabase(), tableName, columnName).Scan(&count)
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return count > 0
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}
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func (s mssql) CurrentDatabase() (name string) {
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s.db.QueryRow("SELECT DB_NAME() AS [Current Database]").Scan(&name)
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return
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}
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func (mssql) LimitAndOffsetSQL(limit, offset interface{}) (sql string) {
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if offset != nil {
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if parsedOffset, err := strconv.ParseInt(fmt.Sprint(offset), 0, 0); err == nil && parsedOffset > 0 {
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sql += fmt.Sprintf(" OFFSET %d ROWS", parsedOffset)
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}
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}
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if limit != nil {
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if parsedLimit, err := strconv.ParseInt(fmt.Sprint(limit), 0, 0); err == nil && parsedLimit > 0 {
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if sql == "" {
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// add default zero offset
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sql += " OFFSET 0 ROWS"
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}
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sql += fmt.Sprintf(" FETCH NEXT %d ROWS ONLY", parsedLimit)
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}
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}
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return
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}
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func (mssql) SelectFromDummyTable() string {
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return ""
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}
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func (mssql) LastInsertIDReturningSuffix(tableName, columnName string) string {
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return ""
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}
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