mirror of https://github.com/go-gorm/gorm.git
128 lines
2.9 KiB
Go
128 lines
2.9 KiB
Go
package mssql
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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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_ "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 Dialector struct {
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DSN string
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}
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func (dialector Dialector) Name() string {
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return "mssql"
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}
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func Open(dsn string) gorm.Dialector {
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return &Dialector{DSN: dsn}
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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.ConnPool, err = sql.Open("sqlserver", dialector.DSN)
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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 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 ROWS")
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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) 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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writer.WriteString(str)
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writer.WriteByte('"')
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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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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 || field == field.Schema.PrioritizedPrimaryField {
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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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return "float"
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case schema.String:
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size := field.Size
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if field.PrimaryKey && size == 0 {
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size = 256
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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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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 ""
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}
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