gorm/dialect_common.go

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package gorm
import (
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"database/sql"
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"fmt"
"reflect"
"regexp"
"strconv"
"strings"
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"time"
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)
// DefaultForeignKeyNamer contains the default foreign key name generator method
type DefaultForeignKeyNamer struct {
}
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type commonDialect struct {
db *sql.DB
DefaultForeignKeyNamer
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}
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func init() {
RegisterDialect("common", &commonDialect{})
}
func (commonDialect) GetName() string {
return "common"
}
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func (s *commonDialect) SetDB(db *sql.DB) {
s.db = db
}
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func (commonDialect) BindVar(i int) string {
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return "$$" // ?
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}
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func (commonDialect) Quote(key string) string {
return fmt.Sprintf(`"%s"`, key)
}
func (s *commonDialect) DataTypeOf(field *StructField) string {
var dataValue, sqlType, size, additionalType = ParseFieldStructForDialect(field, s)
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if sqlType == "" {
switch dataValue.Kind() {
case reflect.Bool:
sqlType = "BOOLEAN"
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok {
sqlType = "INTEGER AUTO_INCREMENT"
} else {
sqlType = "INTEGER"
}
case reflect.Int64, reflect.Uint64:
if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok {
sqlType = "BIGINT AUTO_INCREMENT"
} else {
sqlType = "BIGINT"
}
case reflect.Float32, reflect.Float64:
sqlType = "FLOAT"
case reflect.String:
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if size > 0 && size < 65532 {
sqlType = fmt.Sprintf("VARCHAR(%d)", size)
} else {
sqlType = "VARCHAR(65532)"
}
case reflect.Struct:
if _, ok := dataValue.Interface().(time.Time); ok {
sqlType = "TIMESTAMP"
}
default:
if _, ok := dataValue.Interface().([]byte); ok {
if size > 0 && size < 65532 {
sqlType = fmt.Sprintf("BINARY(%d)", size)
} else {
sqlType = "BINARY(65532)"
}
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}
}
}
if sqlType == "" {
panic(fmt.Sprintf("invalid sql type %s (%s) for commonDialect", dataValue.Type().Name(), dataValue.Kind().String()))
}
if strings.TrimSpace(additionalType) == "" {
return sqlType
}
return fmt.Sprintf("%v %v", sqlType, additionalType)
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}
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func (s commonDialect) HasIndex(tableName string, indexName string) bool {
var count int
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.STATISTICS WHERE table_schema = ? AND table_name = ? AND index_name = ?", s.CurrentDatabase(), tableName, indexName).Scan(&count)
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return count > 0
}
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func (s commonDialect) RemoveIndex(tableName string, indexName string) error {
_, err := s.db.Exec(fmt.Sprintf("DROP INDEX %v", indexName))
return err
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}
func (s commonDialect) HasForeignKey(tableName string, foreignKeyName string) bool {
return false
}
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func (s commonDialect) HasTable(tableName string) bool {
var count int
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = ? AND table_name = ?", s.CurrentDatabase(), tableName).Scan(&count)
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return count > 0
}
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func (s commonDialect) HasColumn(tableName string, columnName string) bool {
var count int
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = ? AND table_name = ? AND column_name = ?", s.CurrentDatabase(), tableName, columnName).Scan(&count)
return count > 0
}
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func (s commonDialect) CurrentDatabase() (name string) {
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s.db.QueryRow("SELECT DATABASE()").Scan(&name)
return
}
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func (commonDialect) LimitAndOffsetSQL(limit, offset interface{}) (sql string) {
if limit != nil {
if parsedLimit, err := strconv.ParseInt(fmt.Sprint(limit), 0, 0); err == nil && parsedLimit > 0 {
sql += fmt.Sprintf(" LIMIT %d", parsedLimit)
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}
}
if offset != nil {
if parsedOffset, err := strconv.ParseInt(fmt.Sprint(offset), 0, 0); err == nil && parsedOffset > 0 {
sql += fmt.Sprintf(" OFFSET %d", parsedOffset)
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}
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}
return
}
func (commonDialect) SelectFromDummyTable() string {
return ""
}
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func (commonDialect) LastInsertIDReturningSuffix(tableName, columnName string) string {
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return ""
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}
func (DefaultForeignKeyNamer) BuildForeignKeyName(tableName, field, dest string) string {
keyName := fmt.Sprintf("%s_%s_%s_foreign", tableName, field, dest)
keyName = regexp.MustCompile("(_*[^a-zA-Z]+_*|_+)").ReplaceAllString(keyName, "_")
return keyName
}