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214 lines
4.9 KiB
214 lines
4.9 KiB
package sqlserver
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import (
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"database/sql"
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"fmt"
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"regexp"
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"strconv"
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"strings"
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_ "github.com/denisenkom/go-mssqldb"
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"gorm.io/gorm"
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"gorm.io/gorm/callbacks"
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"gorm.io/gorm/clause"
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"gorm.io/gorm/logger"
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"gorm.io/gorm/migrator"
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"gorm.io/gorm/schema"
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)
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type Config struct {
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DriverName string
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DSN string
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DefaultStringSize int
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Conn gorm.ConnPool
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}
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type Dialector struct {
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*Config
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}
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func (dialector Dialector) Name() string {
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return "sqlserver"
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}
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func Open(dsn string) gorm.Dialector {
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return &Dialector{Config: &Config{DSN: dsn}}
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}
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func New(config Config) gorm.Dialector {
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return &Dialector{Config: &config}
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}
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func (dialector Dialector) Initialize(db *gorm.DB) (err error) {
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// register callbacks
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callbacks.RegisterDefaultCallbacks(db, &callbacks.Config{})
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db.Callback().Create().Replace("gorm:create", Create)
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db.Callback().Update().Replace("gorm:update", Update)
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if dialector.DriverName == "" {
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dialector.DriverName = "sqlserver"
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}
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if dialector.Conn != nil {
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db.ConnPool = dialector.Conn
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} else {
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db.ConnPool, err = sql.Open(dialector.DriverName, dialector.DSN)
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if err != nil {
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return err
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}
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}
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for k, v := range dialector.ClauseBuilders() {
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db.ClauseBuilders[k] = v
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}
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return
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}
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func (dialector Dialector) ClauseBuilders() map[string]clause.ClauseBuilder {
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return map[string]clause.ClauseBuilder{
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"LIMIT": func(c clause.Clause, builder clause.Builder) {
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if limit, ok := c.Expression.(clause.Limit); ok {
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if stmt, ok := builder.(*gorm.Statement); ok {
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if _, ok := stmt.Clauses["ORDER BY"]; !ok {
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if stmt.Schema != nil && stmt.Schema.PrioritizedPrimaryField != nil {
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builder.WriteString("ORDER BY ")
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builder.WriteQuoted(stmt.Schema.PrioritizedPrimaryField.DBName)
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builder.WriteByte(' ')
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} else {
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builder.WriteString("ORDER BY (SELECT NULL) ")
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}
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}
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}
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if limit.Offset > 0 {
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builder.WriteString("OFFSET ")
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builder.WriteString(strconv.Itoa(limit.Offset))
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builder.WriteString(" ROWS")
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}
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if limit.Limit > 0 {
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if limit.Offset == 0 {
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builder.WriteString("OFFSET 0 ROW")
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}
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builder.WriteString(" FETCH NEXT ")
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builder.WriteString(strconv.Itoa(limit.Limit))
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builder.WriteString(" ROWS ONLY")
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}
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}
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},
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}
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}
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func (dialector Dialector) DefaultValueOf(field *schema.Field) clause.Expression {
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return clause.Expr{SQL: "NULL"}
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}
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func (dialector Dialector) Migrator(db *gorm.DB) gorm.Migrator {
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return Migrator{migrator.Migrator{Config: migrator.Config{
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DB: db,
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Dialector: dialector,
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CreateIndexAfterCreateTable: true,
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}}}
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}
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func (dialector Dialector) BindVarTo(writer clause.Writer, stmt *gorm.Statement, v interface{}) {
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writer.WriteString("@p")
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writer.WriteString(strconv.Itoa(len(stmt.Vars)))
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}
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func (dialector Dialector) QuoteTo(writer clause.Writer, str string) {
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writer.WriteByte('"')
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if strings.Contains(str, ".") {
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for idx, str := range strings.Split(str, ".") {
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if idx > 0 {
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writer.WriteString(`."`)
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}
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writer.WriteString(str)
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writer.WriteByte('"')
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}
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} else {
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writer.WriteString(str)
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writer.WriteByte('"')
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}
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}
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var numericPlaceholder = regexp.MustCompile("@p(\\d+)")
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func (dialector Dialector) Explain(sql string, vars ...interface{}) string {
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for idx, v := range vars {
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if b, ok := v.(bool); ok {
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if b {
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vars[idx] = 1
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} else {
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vars[idx] = 0
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}
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}
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}
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return logger.ExplainSQL(sql, numericPlaceholder, `'`, vars...)
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}
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func (dialector Dialector) DataTypeOf(field *schema.Field) string {
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switch field.DataType {
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case schema.Bool:
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return "bit"
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case schema.Int, schema.Uint:
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var sqlType string
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switch {
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case field.Size < 16:
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sqlType = "smallint"
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case field.Size < 31:
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sqlType = "int"
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default:
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sqlType = "bigint"
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}
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if field.AutoIncrement {
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return sqlType + " IDENTITY(1,1)"
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}
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return sqlType
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case schema.Float:
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if field.Precision > 0 {
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if field.Scale > 0 {
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return fmt.Sprintf("decimal(%d, %d)", field.Precision, field.Scale)
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}
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return fmt.Sprintf("decimal(%d)", field.Precision)
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}
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return "float"
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case schema.String:
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size := field.Size
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hasIndex := field.TagSettings["INDEX"] != "" || field.TagSettings["UNIQUE"] != ""
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if (field.PrimaryKey || hasIndex) && size == 0 {
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if dialector.DefaultStringSize > 0 {
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size = dialector.DefaultStringSize
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} else {
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size = 256
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}
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}
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if size > 0 && size <= 4000 {
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return fmt.Sprintf("nvarchar(%d)", size)
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}
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return "nvarchar(MAX)"
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case schema.Time:
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if field.Precision > 0 {
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return fmt.Sprintf("datetimeoffset(%d)", field.Precision)
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}
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return "datetimeoffset"
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case schema.Bytes:
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return "varbinary(MAX)"
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}
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return string(field.DataType)
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}
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func (dialectopr Dialector) SavePoint(tx *gorm.DB, name string) error {
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tx.Exec("SAVE TRANSACTION " + name)
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return nil
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}
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func (dialectopr Dialector) RollbackTo(tx *gorm.DB, name string) error {
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tx.Exec("ROLLBACK TRANSACTION " + name)
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return nil
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}
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