init commit

vendor/github.com/jinzhu/gorm/dialect_mysql.go

@@ -0,0 +1,191 @@
+package gorm
+
+import (
+	"crypto/sha1"
+	"fmt"
+	"reflect"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+	"unicode/utf8"
+)
+
+type mysql struct {
+	commonDialect
+}
+
+func init() {
+	RegisterDialect("mysql", &mysql{})
+}
+
+func (mysql) GetName() string {
+	return "mysql"
+}
+
+func (mysql) Quote(key string) string {
+	return fmt.Sprintf("`%s`", key)
+}
+
+// Get Data Type for MySQL Dialect
+func (s *mysql) DataTypeOf(field *StructField) string {
+	var dataValue, sqlType, size, additionalType = ParseFieldStructForDialect(field, s)
+
+	// MySQL allows only one auto increment column per table, and it must
+	// be a KEY column.
+	if _, ok := field.TagSettingsGet("AUTO_INCREMENT"); ok {
+		if _, ok = field.TagSettingsGet("INDEX"); !ok && !field.IsPrimaryKey {
+			field.TagSettingsDelete("AUTO_INCREMENT")
+		}
+	}
+
+	if sqlType == "" {
+		switch dataValue.Kind() {
+		case reflect.Bool:
+			sqlType = "boolean"
+		case reflect.Int8:
+			if s.fieldCanAutoIncrement(field) {
+				field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
+				sqlType = "tinyint AUTO_INCREMENT"
+			} else {
+				sqlType = "tinyint"
+			}
+		case reflect.Int, reflect.Int16, reflect.Int32:
+			if s.fieldCanAutoIncrement(field) {
+				field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
+				sqlType = "int AUTO_INCREMENT"
+			} else {
+				sqlType = "int"
+			}
+		case reflect.Uint8:
+			if s.fieldCanAutoIncrement(field) {
+				field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
+				sqlType = "tinyint unsigned AUTO_INCREMENT"
+			} else {
+				sqlType = "tinyint unsigned"
+			}
+		case reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
+			if s.fieldCanAutoIncrement(field) {
+				field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
+				sqlType = "int unsigned AUTO_INCREMENT"
+			} else {
+				sqlType = "int unsigned"
+			}
+		case reflect.Int64:
+			if s.fieldCanAutoIncrement(field) {
+				field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
+				sqlType = "bigint AUTO_INCREMENT"
+			} else {
+				sqlType = "bigint"
+			}
+		case reflect.Uint64:
+			if s.fieldCanAutoIncrement(field) {
+				field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
+				sqlType = "bigint unsigned AUTO_INCREMENT"
+			} else {
+				sqlType = "bigint unsigned"
+			}
+		case reflect.Float32, reflect.Float64:
+			sqlType = "double"
+		case reflect.String:
+			if size > 0 && size < 65532 {
+				sqlType = fmt.Sprintf("varchar(%d)", size)
+			} else {
+				sqlType = "longtext"
+			}
+		case reflect.Struct:
+			if _, ok := dataValue.Interface().(time.Time); ok {
+				precision := ""
+				if p, ok := field.TagSettingsGet("PRECISION"); ok {
+					precision = fmt.Sprintf("(%s)", p)
+				}
+
+				if _, ok := field.TagSettingsGet("NOT NULL"); ok {
+					sqlType = fmt.Sprintf("timestamp%v", precision)
+				} else {
+					sqlType = fmt.Sprintf("timestamp%v NULL", precision)
+				}
+			}
+		default:
+			if IsByteArrayOrSlice(dataValue) {
+				if size > 0 && size < 65532 {
+					sqlType = fmt.Sprintf("varbinary(%d)", size)
+				} else {
+					sqlType = "longblob"
+				}
+			}
+		}
+	}
+
+	if sqlType == "" {
+		panic(fmt.Sprintf("invalid sql type %s (%s) for mysql", dataValue.Type().Name(), dataValue.Kind().String()))
+	}
+
+	if strings.TrimSpace(additionalType) == "" {
+		return sqlType
+	}
+	return fmt.Sprintf("%v %v", sqlType, additionalType)
+}
+
+func (s mysql) RemoveIndex(tableName string, indexName string) error {
+	_, err := s.db.Exec(fmt.Sprintf("DROP INDEX %v ON %v", indexName, s.Quote(tableName)))
+	return err
+}
+
+func (s mysql) ModifyColumn(tableName string, columnName string, typ string) error {
+	_, err := s.db.Exec(fmt.Sprintf("ALTER TABLE %v MODIFY COLUMN %v %v", tableName, columnName, typ))
+	return err
+}
+
+func (s mysql) 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)
+
+			if offset != nil {
+				if parsedOffset, err := strconv.ParseInt(fmt.Sprint(offset), 0, 0); err == nil && parsedOffset >= 0 {
+					sql += fmt.Sprintf(" OFFSET %d", parsedOffset)
+				}
+			}
+		}
+	}
+	return
+}
+
+func (s mysql) HasForeignKey(tableName string, foreignKeyName string) bool {
+	var count int
+	currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
+	s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE CONSTRAINT_SCHEMA=? AND TABLE_NAME=? AND CONSTRAINT_NAME=? AND CONSTRAINT_TYPE='FOREIGN KEY'", currentDatabase, tableName, foreignKeyName).Scan(&count)
+	return count > 0
+}
+
+func (s mysql) CurrentDatabase() (name string) {
+	s.db.QueryRow("SELECT DATABASE()").Scan(&name)
+	return
+}
+
+func (mysql) SelectFromDummyTable() string {
+	return "FROM DUAL"
+}
+
+func (s mysql) BuildKeyName(kind, tableName string, fields ...string) string {
+	keyName := s.commonDialect.BuildKeyName(kind, tableName, fields...)
+	if utf8.RuneCountInString(keyName) <= 64 {
+		return keyName
+	}
+	h := sha1.New()
+	h.Write([]byte(keyName))
+	bs := h.Sum(nil)
+
+	// sha1 is 40 characters, keep first 24 characters of destination
+	destRunes := []rune(regexp.MustCompile("[^a-zA-Z0-9]+").ReplaceAllString(fields[0], "_"))
+	if len(destRunes) > 24 {
+		destRunes = destRunes[:24]
+	}
+
+	return fmt.Sprintf("%s%x", string(destRunes), bs)
+}
+
+func (mysql) DefaultValueStr() string {
+	return "VALUES()"
+}