148 lines
3.9 KiB
Go
148 lines
3.9 KiB
Go
package gorm
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import (
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"encoding/json"
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"fmt"
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"reflect"
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"strings"
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"time"
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)
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type postgres struct {
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commonDialect
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}
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func init() {
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RegisterDialect("postgres", &postgres{})
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RegisterDialect("cloudsqlpostgres", &postgres{})
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}
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func (postgres) GetName() string {
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return "postgres"
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}
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func (postgres) BindVar(i int) string {
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return fmt.Sprintf("$%v", i)
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}
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func (s *postgres) DataTypeOf(field *StructField) string {
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var dataValue, sqlType, size, additionalType = 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 = "boolean"
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uintptr:
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if s.fieldCanAutoIncrement(field) {
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field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
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sqlType = "serial"
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} else {
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sqlType = "integer"
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}
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case reflect.Int64, reflect.Uint32, reflect.Uint64:
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if s.fieldCanAutoIncrement(field) {
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field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
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sqlType = "bigserial"
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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 = "numeric"
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case reflect.String:
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if _, ok := field.TagSettingsGet("SIZE"); !ok {
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size = 0 // if SIZE haven't been set, use `text` as the default type, as there are no performance different
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}
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if size > 0 && size < 65532 {
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sqlType = fmt.Sprintf("varchar(%d)", size)
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} else {
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sqlType = "text"
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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 = "timestamp with time zone"
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}
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case reflect.Map:
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if dataValue.Type().Name() == "Hstore" {
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sqlType = "hstore"
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}
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default:
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if IsByteArrayOrSlice(dataValue) {
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sqlType = "bytea"
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if isUUID(dataValue) {
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sqlType = "uuid"
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}
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if isJSON(dataValue) {
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sqlType = "jsonb"
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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 postgres", 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 postgres) HasIndex(tableName string, indexName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM pg_indexes WHERE tablename = $1 AND indexname = $2 AND schemaname = CURRENT_SCHEMA()", tableName, indexName).Scan(&count)
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return count > 0
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}
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func (s postgres) HasForeignKey(tableName string, foreignKeyName string) bool {
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var count int
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s.db.QueryRow("SELECT count(con.conname) FROM pg_constraint con WHERE $1::regclass::oid = con.conrelid AND con.conname = $2 AND con.contype='f'", tableName, foreignKeyName).Scan(&count)
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return count > 0
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}
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func (s postgres) 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 = $1 AND table_type = 'BASE TABLE' AND table_schema = CURRENT_SCHEMA()", tableName).Scan(&count)
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return count > 0
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}
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func (s postgres) 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_name = $1 AND column_name = $2 AND table_schema = CURRENT_SCHEMA()", tableName, columnName).Scan(&count)
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return count > 0
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}
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func (s postgres) CurrentDatabase() (name string) {
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s.db.QueryRow("SELECT CURRENT_DATABASE()").Scan(&name)
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return
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}
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func (s postgres) LastInsertIDOutputInterstitial(tableName, key string, columns []string) string {
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return ""
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}
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func (s postgres) LastInsertIDReturningSuffix(tableName, key string) string {
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return fmt.Sprintf("RETURNING %v.%v", tableName, key)
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}
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func (postgres) SupportLastInsertID() bool {
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return false
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}
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func isUUID(value reflect.Value) bool {
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if value.Kind() != reflect.Array || value.Type().Len() != 16 {
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return false
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}
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typename := value.Type().Name()
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lower := strings.ToLower(typename)
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return "uuid" == lower || "guid" == lower
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}
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func isJSON(value reflect.Value) bool {
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_, ok := value.Interface().(json.RawMessage)
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return ok
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}
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