mirror of https://github.com/go-gorm/gorm.git
103 lines
2.2 KiB
Go
103 lines
2.2 KiB
Go
package postgres
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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/jinzhu/gorm"
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"github.com/jinzhu/gorm/callbacks"
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"github.com/jinzhu/gorm/clause"
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"github.com/jinzhu/gorm/logger"
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"github.com/jinzhu/gorm/migrator"
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"github.com/jinzhu/gorm/schema"
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_ "github.com/lib/pq"
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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 Open(dsn string) gorm.Dialector {
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return &Dialector{DSN: dsn}
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}
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func (dialector Dialector) Name() string {
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return "postgres"
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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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WithReturning: true,
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})
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db.ConnPool, err = sql.Open("postgres", dialector.DSN)
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return
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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.WriteByte('$')
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writer.WriteString(strconv.Itoa(len(stmt.Vars)))
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}
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func (dialector Dialector) QuoteTo(writer clause.Writer, str string) {
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writer.WriteByte('"')
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writer.WriteString(str)
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writer.WriteByte('"')
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}
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var numericPlaceholder = regexp.MustCompile("\\$(\\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 "boolean"
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case schema.Int, schema.Uint:
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if field.AutoIncrement || field == field.Schema.PrioritizedPrimaryField {
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switch {
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case field.Size < 16:
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return "smallserial"
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case field.Size < 31:
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return "serial"
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default:
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return "bigserial"
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}
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} else {
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switch {
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case field.Size < 16:
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return "smallint"
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case field.Size < 31:
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return "integer"
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default:
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return "bigint"
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}
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}
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case schema.Float:
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return "decimal"
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case schema.String:
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if field.Size > 0 {
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return fmt.Sprintf("varchar(%d)", field.Size)
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}
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return "text"
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case schema.Time:
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return "timestamptz"
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case schema.Bytes:
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return "bytea"
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}
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return ""
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}
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