mirror of https://github.com/go-gorm/gorm.git
142 lines
3.4 KiB
Go
142 lines
3.4 KiB
Go
package gorm
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import (
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"database/sql"
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"database/sql/driver"
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"fmt"
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"reflect"
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"github.com/lib/pq/hstore"
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)
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type postgres struct {
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}
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func (s *postgres) BinVar(i int) string {
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return fmt.Sprintf("$%v", i)
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}
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func (s *postgres) SupportLastInsertId() bool {
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return false
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}
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func (s *postgres) HasTop() bool {
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return false
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}
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func (d *postgres) SqlTag(value reflect.Value, size int) string {
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switch value.Kind() {
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case reflect.Bool:
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return "boolean"
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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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return "integer"
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case reflect.Int64, reflect.Uint64:
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return "bigint"
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case reflect.Float32, reflect.Float64:
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return "numeric"
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case reflect.String:
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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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case reflect.Struct:
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if value.Type() == timeType {
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return "timestamp with time zone"
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}
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case reflect.Map:
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if value.Type() == hstoreType {
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return "hstore"
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}
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default:
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if _, ok := value.Interface().([]byte); ok {
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return "bytea"
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}
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}
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panic(fmt.Sprintf("invalid sql type %s (%s) for postgres", value.Type().Name(), value.Kind().String()))
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}
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func (s *postgres) PrimaryKeyTag(value reflect.Value, size int) string {
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switch value.Kind() {
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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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return "serial PRIMARY KEY"
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case reflect.Int64, reflect.Uint64:
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return "bigserial PRIMARY KEY"
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default:
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panic("Invalid primary key type")
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}
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}
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func (s *postgres) ReturningStr(key string) string {
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return fmt.Sprintf("RETURNING \"%v\"", key)
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}
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func (s *postgres) SelectFromDummyTable() string {
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return ""
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}
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func (s *postgres) Quote(key string) string {
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return fmt.Sprintf("\"%s\"", key)
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}
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func (s *postgres) HasTable(scope *Scope, tableName string) bool {
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var count int
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newScope := scope.New(nil)
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newScope.Raw(fmt.Sprintf("SELECT count(*) FROM INFORMATION_SCHEMA.tables where table_name = %v and table_type = 'BASE TABLE'", newScope.AddToVars(tableName)))
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newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
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return count > 0
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}
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func (s *postgres) HasColumn(scope *Scope, tableName string, columnName string) bool {
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var count int
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newScope := scope.New(nil)
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newScope.Raw(fmt.Sprintf("SELECT count(*) FROM information_schema.columns WHERE table_name = %v AND column_name = %v",
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newScope.AddToVars(tableName),
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newScope.AddToVars(columnName),
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))
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newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
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return count > 0
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}
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func (s *postgres) RemoveIndex(scope *Scope, indexName string) {
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scope.Raw(fmt.Sprintf("DROP INDEX %v", indexName)).Exec()
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}
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var hstoreType = reflect.TypeOf(Hstore{})
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type Hstore map[string]*string
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func (h Hstore) Value() (driver.Value, error) {
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hstore := hstore.Hstore{Map: map[string]sql.NullString{}}
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if len(h) == 0 {
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return nil, nil
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}
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for key, value := range h {
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hstore.Map[key] = sql.NullString{String: *value, Valid: true}
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}
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return hstore.Value()
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}
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func (h *Hstore) Scan(value interface{}) error {
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hstore := hstore.Hstore{}
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if err := hstore.Scan(value); err != nil {
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return err
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}
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if len(hstore.Map) == 0 {
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return nil
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}
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*h = Hstore{}
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for k := range hstore.Map {
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if hstore.Map[k].Valid {
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s := hstore.Map[k].String
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(*h)[k] = &s
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} else {
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(*h)[k] = nil
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}
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}
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return nil
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}
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