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289 lines
8.3 KiB
289 lines
8.3 KiB
package dialects
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import (
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"fmt"
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"reflect"
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"regexp"
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"strconv"
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"strings"
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"time"
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"github.com/jinzhu/gorm"
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)
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var keyNameRegex = regexp.MustCompile("[^a-zA-Z0-9]+")
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// DefaultForeignKeyNamer contains the default foreign key name generator method
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type DefaultForeignKeyNamer struct {
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}
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type commonDialect struct {
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db gorm.SQLCommon
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DefaultForeignKeyNamer
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}
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func (commonDialect) GetName() string {
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return "common"
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}
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func (s *commonDialect) SetDB(db gorm.SQLCommon) {
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s.db = db
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}
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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 {
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return fmt.Sprintf(`"%s"`, key)
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}
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func (s *commonDialect) fieldCanAutoIncrement(field *gorm.StructField) bool {
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if value, ok := field.TagSettingsGet("AUTO_INCREMENT"); ok {
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return strings.ToLower(value) != "false"
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}
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return field.IsPrimaryKey
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}
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func (s *commonDialect) DataTypeOf(field *gorm.StructField) string {
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var dataValue, sqlType, size, additionalType = gorm.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.Uint32, reflect.Uintptr:
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if s.fieldCanAutoIncrement(field) {
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sqlType = "INTEGER AUTO_INCREMENT"
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} else {
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sqlType = "INTEGER"
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}
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case reflect.Int64, reflect.Uint64:
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if s.fieldCanAutoIncrement(field) {
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sqlType = "BIGINT AUTO_INCREMENT"
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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 = "FLOAT"
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case reflect.String:
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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 = "VARCHAR(65532)"
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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"
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}
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default:
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if _, ok := dataValue.Interface().([]byte); ok {
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if size > 0 && size < 65532 {
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sqlType = fmt.Sprintf("BINARY(%d)", size)
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} else {
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sqlType = "BINARY(65532)"
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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 commonDialect", 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 currentDatabaseAndTable(dialect gorm.Dialect, tableName string) (string, string) {
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if strings.Contains(tableName, ".") {
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splitStrings := strings.SplitN(tableName, ".", 2)
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return splitStrings[0], splitStrings[1]
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}
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return dialect.CurrentDatabase(), tableName
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}
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func (s commonDialect) HasIndex(tableName string, indexName string) bool {
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var count int
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currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.STATISTICS WHERE table_schema = ? AND table_name = ? AND index_name = ?", currentDatabase, tableName, indexName).Scan(&count)
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return count > 0
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}
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func (s commonDialect) RemoveIndex(tableName string, indexName string) error {
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_, err := s.db.Exec(fmt.Sprintf("DROP INDEX %v", indexName))
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return err
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}
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func (s commonDialect) HasForeignKey(tableName string, foreignKeyName string) bool {
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return false
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}
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func (s commonDialect) HasTable(tableName string) bool {
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var count int
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currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = ? AND table_name = ?", currentDatabase, tableName).Scan(&count)
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return count > 0
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}
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func (s commonDialect) HasColumn(tableName string, columnName string) bool {
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var count int
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currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = ? AND table_name = ? AND column_name = ?", currentDatabase, tableName, columnName).Scan(&count)
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return count > 0
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}
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func (s commonDialect) ModifyColumn(tableName string, columnName string, typ string) error {
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_, err := s.db.Exec(fmt.Sprintf("ALTER TABLE %v ALTER COLUMN %v TYPE %v", tableName, columnName, typ))
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return err
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}
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func (s commonDialect) CurrentDatabase() (name string) {
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s.db.QueryRow("SELECT DATABASE()").Scan(&name)
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return
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}
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func (commonDialect) LimitAndOffsetSQL(limit, offset interface{}) (sql string) {
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if limit != nil {
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if parsedLimit, err := strconv.ParseInt(fmt.Sprint(limit), 0, 0); err == nil && parsedLimit >= 0 {
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sql += fmt.Sprintf(" LIMIT %d", parsedLimit)
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}
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}
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if offset != nil {
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if parsedOffset, err := strconv.ParseInt(fmt.Sprint(offset), 0, 0); err == nil && parsedOffset >= 0 {
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sql += fmt.Sprintf(" OFFSET %d", parsedOffset)
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}
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}
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return
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}
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func (commonDialect) SelectFromDummyTable() string {
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return ""
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}
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func (commonDialect) LastInsertIDReturningSuffix(tableName, columnName string) string {
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return ""
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}
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func (commonDialect) DefaultValueStr() string {
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return "DEFAULT VALUES"
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}
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// BuildKeyName returns a valid key name (foreign key, index key) for the given table, field and reference
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func (DefaultForeignKeyNamer) BuildKeyName(kind, tableName string, fields ...string) string {
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keyName := fmt.Sprintf("%s_%s_%s", kind, tableName, strings.Join(fields, "_"))
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keyName = keyNameRegex.ReplaceAllString(keyName, "_")
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return keyName
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}
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// NormalizeIndexAndColumn returns argument's index name and column name without doing anything
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func (commonDialect) NormalizeIndexAndColumn(indexName, columnName string) (string, string) {
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return indexName, columnName
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}
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// IsByteArrayOrSlice returns true of the reflected value is an array or slice
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func IsByteArrayOrSlice(value reflect.Value) bool {
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return (value.Kind() == reflect.Array || value.Kind() == reflect.Slice) && value.Type().Elem() == reflect.TypeOf(uint8(0))
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}
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type sqlite struct {
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commonDialect
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}
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func init() {
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gorm.RegisterDialect("sqlite", &sqlite{})
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}
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func (sqlite) GetName() string {
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return "sqlite"
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}
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// Get Data Type for Sqlite Dialect
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func (s *sqlite) DataTypeOf(field *gorm.StructField) string {
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var dataValue, sqlType, size, additionalType = gorm.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 = "bool"
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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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if s.fieldCanAutoIncrement(field) {
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field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
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sqlType = "integer primary key autoincrement"
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} else {
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sqlType = "integer"
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}
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case reflect.Int64, 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 = "integer primary key autoincrement"
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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 = "real"
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case reflect.String:
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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 = "datetime"
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}
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default:
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if IsByteArrayOrSlice(dataValue) {
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sqlType = "blob"
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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 sqlite", 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 sqlite) HasIndex(tableName string, indexName string) bool {
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var count int
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s.db.QueryRow(fmt.Sprintf("SELECT count(*) FROM sqlite_master WHERE tbl_name = ? AND sql LIKE '%%INDEX %v ON%%'", indexName), tableName).Scan(&count)
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return count > 0
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}
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func (s sqlite) HasTable(tableName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM sqlite_master WHERE type='table' AND name=?", tableName).Scan(&count)
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return count > 0
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}
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func (s sqlite) HasColumn(tableName string, columnName string) bool {
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var count int
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s.db.QueryRow(fmt.Sprintf("SELECT count(*) FROM sqlite_master WHERE tbl_name = ? AND (sql LIKE '%%\"%v\" %%' OR sql LIKE '%%%v %%');\n", columnName, columnName), tableName).Scan(&count)
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return count > 0
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}
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func (s sqlite) CurrentDatabase() (name string) {
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var (
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ifaces = make([]interface{}, 3)
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pointers = make([]*string, 3)
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i int
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)
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for i = 0; i < 3; i++ {
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ifaces[i] = &pointers[i]
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}
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if err := s.db.QueryRow("PRAGMA database_list").Scan(ifaces...); err != nil {
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return
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}
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if pointers[1] != nil {
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name = *pointers[1]
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}
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return
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}
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