diff --git a/orm/cmd.go b/orm/cmd.go
new file mode 100644
index 00000000..174091f4
--- /dev/null
+++ b/orm/cmd.go
@@ -0,0 +1,144 @@
+package orm
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+)
+
+type commander interface {
+	Parse([]string)
+	Run()
+}
+
+var (
+	commands = make(map[string]commander)
+)
+
+func printHelp(errs ...string) {
+	content := `orm command usage:
+
+    syncdb     - auto create tables
+    sqlall     - print sql of create tables
+    help       - print this help
+`
+
+	if len(errs) > 0 {
+		fmt.Println(errs[0])
+	}
+	fmt.Println(content)
+	os.Exit(2)
+}
+
+func RunCommand() {
+	if len(os.Args) < 2 || os.Args[1] != "orm" {
+		return
+	}
+
+	BootStrap()
+
+	args := argString(os.Args[2:])
+	name := args.Get(0)
+
+	if name == "help" {
+		printHelp()
+	}
+
+	if cmd, ok := commands[name]; ok {
+		cmd.Parse(os.Args[3:])
+		cmd.Run()
+		os.Exit(0)
+	} else {
+		if name == "" {
+			printHelp()
+		} else {
+			printHelp(fmt.Sprintf("unknown command %s", name))
+		}
+	}
+}
+
+type commandSyncDb struct {
+	al      *alias
+	force   bool
+	verbose bool
+}
+
+func (d *commandSyncDb) Parse(args []string) {
+	var name string
+
+	flagSet := flag.NewFlagSet("orm command: syncdb", flag.ExitOnError)
+	flagSet.StringVar(&name, "db", "default", "DataBase alias name")
+	flagSet.BoolVar(&d.force, "force", false, "drop tables before create")
+	flagSet.BoolVar(&d.verbose, "v", false, "verbose info")
+	flagSet.Parse(args)
+
+	d.al = getDbAlias(name)
+}
+
+func (d *commandSyncDb) Run() {
+	var drops []string
+	if d.force {
+		drops = getDbDropSql(d.al)
+	}
+
+	db := d.al.DB
+
+	if d.force {
+		for i, mi := range modelCache.allOrdered() {
+			query := drops[i]
+			_, err := db.Exec(query)
+			result := ""
+			if err != nil {
+				result = err.Error()
+			}
+			fmt.Printf("drop table `%s` %s\n", mi.table, result)
+			if d.verbose {
+				fmt.Printf("    %s\n\n", query)
+			}
+		}
+	}
+
+	tables := getDbCreateSql(d.al)
+
+	for i, mi := range modelCache.allOrdered() {
+		query := tables[i]
+		_, err := db.Exec(query)
+		fmt.Printf("create table `%s` \n", mi.table)
+		if d.verbose {
+			query = "    " + strings.Join(strings.Split(query, "\n"), "\n    ")
+			fmt.Println(query)
+		}
+		if err != nil {
+			fmt.Printf("    %s\n", err.Error())
+		}
+		if d.verbose {
+			fmt.Println("")
+		}
+	}
+}
+
+type commandSqlAll struct {
+	al *alias
+}
+
+func (d *commandSqlAll) Parse(args []string) {
+	var name string
+
+	flagSet := flag.NewFlagSet("orm command: sqlall", flag.ExitOnError)
+	flagSet.StringVar(&name, "db", "default", "DataBase alias name")
+	flagSet.Parse(args)
+
+	d.al = getDbAlias(name)
+}
+
+func (d *commandSqlAll) Run() {
+	sqls := getDbCreateSql(d.al)
+	sql := strings.Join(sqls, "\n\n")
+	fmt.Println(sql)
+}
+
+func init() {
+	commands["syncdb"] = new(commandSyncDb)
+	commands["sqlall"] = new(commandSqlAll)
+}
diff --git a/orm/cmd_utils.go b/orm/cmd_utils.go
new file mode 100644
index 00000000..2811ad3a
--- /dev/null
+++ b/orm/cmd_utils.go
@@ -0,0 +1,142 @@
+package orm
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func getDbAlias(name string) *alias {
+	if al, ok := dataBaseCache.get(name); ok {
+		return al
+	} else {
+		fmt.Println(fmt.Sprintf("unknown DataBase alias name %s", name))
+		os.Exit(2)
+	}
+
+	return nil
+}
+
+func getDbDropSql(al *alias) (sqls []string) {
+	if len(modelCache.cache) == 0 {
+		fmt.Println("no Model found, need register your model")
+		os.Exit(2)
+	}
+
+	Q := al.DbBaser.TableQuote()
+
+	for _, mi := range modelCache.allOrdered() {
+		sqls = append(sqls, fmt.Sprintf(`DROP TABLE IF EXISTS %s%s%s`, Q, mi.table, Q))
+	}
+	return sqls
+}
+
+func getDbCreateSql(al *alias) (sqls []string) {
+	if len(modelCache.cache) == 0 {
+		fmt.Println("no Model found, need register your model")
+		os.Exit(2)
+	}
+
+	Q := al.DbBaser.TableQuote()
+	T := al.DbBaser.DbTypes()
+
+	for _, mi := range modelCache.allOrdered() {
+		sql := fmt.Sprintf("-- %s\n", strings.Repeat("-", 50))
+		sql += fmt.Sprintf("--  Table Structure for `%s`\n", mi.fullName)
+		sql += fmt.Sprintf("-- %s\n", strings.Repeat("-", 50))
+
+		sql += fmt.Sprintf("CREATE TABLE IF NOT EXISTS %s%s%s (\n", Q, mi.table, Q)
+
+		columns := make([]string, 0, len(mi.fields.fieldsDB))
+
+		for _, fi := range mi.fields.fieldsDB {
+
+			fieldType := fi.fieldType
+			column := fmt.Sprintf("    %s%s%s ", Q, fi.column, Q)
+			col := ""
+
+		checkColumn:
+			switch fieldType {
+			case TypeBooleanField:
+				col = T["bool"]
+			case TypeCharField:
+				col = fmt.Sprintf(T["string"], fi.size)
+			case TypeTextField:
+				col = T["string-text"]
+			case TypeDateField:
+				col = T["time.Time-date"]
+			case TypeDateTimeField:
+				col = T["time.Time"]
+			case TypeBitField:
+				col = T["int8"]
+			case TypeSmallIntegerField:
+				col = T["int16"]
+			case TypeIntegerField:
+				col = T["int32"]
+			case TypeBigIntegerField:
+				if al.Driver == DR_Sqlite {
+					fieldType = TypeIntegerField
+					goto checkColumn
+				}
+				col = T["int64"]
+			case TypePositiveBitField:
+				col = T["uint8"]
+			case TypePositiveSmallIntegerField:
+				col = T["uint16"]
+			case TypePositiveIntegerField:
+				col = T["uint32"]
+			case TypePositiveBigIntegerField:
+				col = T["uint64"]
+			case TypeFloatField:
+				col = T["float64"]
+			case TypeDecimalField:
+				s := T["float64-decimal"]
+				if strings.Index(s, "%d") == -1 {
+					col = s
+				} else {
+					col = fmt.Sprintf(s, fi.digits, fi.decimals)
+				}
+			case RelForeignKey, RelOneToOne:
+				fieldType = fi.relModelInfo.fields.pk.fieldType
+				goto checkColumn
+			}
+
+			if fi.auto {
+				if al.Driver == DR_Postgres {
+					column += T["auto"]
+				} else {
+					column += col + " " + T["auto"]
+				}
+			} else if fi.pk {
+				column += col + " " + T["pk"]
+			} else {
+				column += col
+
+				if fi.null == false {
+					column += " " + "NOT NULL"
+				}
+
+				if fi.unique {
+					column += " " + "UNIQUE"
+				}
+			}
+
+			if strings.Index(column, "%COL%") != -1 {
+				column = strings.Replace(column, "%COL%", fi.column, -1)
+			}
+
+			columns = append(columns, column)
+		}
+
+		sql += strings.Join(columns, ",\n")
+		sql += "\n)"
+
+		if al.Driver == DR_MySQL {
+			sql += " ENGINE=INNODB"
+		}
+
+		sqls = append(sqls, sql)
+	}
+
+	return sqls
+}
diff --git a/orm/command.go b/orm/command.go
deleted file mode 100644
index 78508bdc..00000000
--- a/orm/command.go
+++ /dev/null
@@ -1,44 +0,0 @@
-package orm
-
-import (
-	"flag"
-	"fmt"
-	"os"
-)
-
-func printHelp() {
-
-}
-
-func getSqlAll() (sql string) {
-	for _, mi := range modelCache.allOrdered() {
-		_ = mi
-	}
-	return
-}
-
-func runCommand() {
-	if len(os.Args) < 2 || os.Args[1] != "orm" {
-		return
-	}
-
-	_ = flag.NewFlagSet("orm command", flag.ExitOnError)
-
-	args := argString(os.Args[2:])
-	cmd := args.Get(0)
-
-	switch cmd {
-	case "syncdb":
-	case "sqlall":
-		sql := getSqlAll()
-		fmt.Println(sql)
-	default:
-		if cmd != "" {
-			fmt.Printf("unknown command %s", cmd)
-		} else {
-			printHelp()
-		}
-
-		os.Exit(2)
-	}
-}
diff --git a/orm/db.go b/orm/db.go
index d09dbe82..7b30797f 100644
--- a/orm/db.go
+++ b/orm/db.go
@@ -805,7 +805,7 @@ setValue:
 				_, err = str.Int32()
 			case TypeBigIntegerField:
 				_, err = str.Int64()
-			case TypePostiveBitField:
+			case TypePositiveBitField:
 				_, err = str.Uint8()
 			case TypePositiveSmallIntegerField:
 				_, err = str.Uint16()
@@ -1112,3 +1112,7 @@ func (d *dbBase) TimeFromDB(t *time.Time, tz *time.Location) {
 func (d *dbBase) TimeToDB(t *time.Time, tz *time.Location) {
 	*t = t.In(tz)
 }
+
+func (d *dbBase) DbTypes() map[string]string {
+	return nil
+}
diff --git a/orm/db_mysql.go b/orm/db_mysql.go
index b6c3a118..08a9b509 100644
--- a/orm/db_mysql.go
+++ b/orm/db_mysql.go
@@ -17,6 +17,26 @@ var mysqlOperators = map[string]string{
 	"iendswith":   "LIKE ?",
 }
 
+var mysqlTypes = map[string]string{
+	"auto":            "AUTO_INCREMENT NOT NULL PRIMARY KEY",
+	"pk":              "NOT NULL PRIMARY KEY",
+	"bool":            "bool",
+	"string":          "varchar(%d)",
+	"string-text":     "longtext",
+	"time.Time-date":  "date",
+	"time.Time":       "datetime",
+	"int8":            "tinyint",
+	"int16":           "smallint",
+	"int32":           "integer",
+	"int64":           "bigint",
+	"uint8":           "tinyint unsigned",
+	"uint16":          "smallint unsigned",
+	"uint32":          "integer unsigned",
+	"uint64":          "bigint unsigned",
+	"float64":         "double precision",
+	"float64-decimal": "numeric(%d, %d)",
+}
+
 type dbBaseMysql struct {
 	dbBase
 }
@@ -27,6 +47,10 @@ func (d *dbBaseMysql) OperatorSql(operator string) string {
 	return mysqlOperators[operator]
 }
 
+func (d *dbBaseMysql) DbTypes() map[string]string {
+	return mysqlTypes
+}
+
 func newdbBaseMysql() dbBaser {
 	b := new(dbBaseMysql)
 	b.ins = b
diff --git a/orm/db_postgres.go b/orm/db_postgres.go
index 729e6aab..5e20a110 100644
--- a/orm/db_postgres.go
+++ b/orm/db_postgres.go
@@ -20,6 +20,26 @@ var postgresOperators = map[string]string{
 	"iendswith":   "LIKE UPPER(?)",
 }
 
+var postgresTypes = map[string]string{
+	"auto":            "serial NOT NULL PRIMARY KEY",
+	"pk":              "NOT NULL PRIMARY KEY",
+	"bool":            "bool",
+	"string":          "varchar(%d)",
+	"string-text":     "text",
+	"time.Time-date":  "date",
+	"time.Time":       "timestamp with time zone",
+	"int8":            `smallint CHECK("%COL%" >= -127 AND "%COL%" <= 128)`,
+	"int16":           "smallint",
+	"int32":           "integer",
+	"int64":           "bigint",
+	"uint8":           `smallint CHECK("%COL%" >= 0 AND "%COL%" <= 255)`,
+	"uint16":          `integer CHECK("%COL%" >= 0)`,
+	"uint32":          `bigint CHECK("%COL%" >= 0)`,
+	"uint64":          `bigint CHECK("%COL%" >= 0)`,
+	"float64":         "double precision",
+	"float64-decimal": "numeric(%d, %d)",
+}
+
 type dbBasePostgres struct {
 	dbBase
 }
@@ -87,6 +107,10 @@ func (d *dbBasePostgres) HasReturningID(mi *modelInfo, query *string) (has bool)
 	return
 }
 
+func (d *dbBasePostgres) DbTypes() map[string]string {
+	return postgresTypes
+}
+
 func newdbBasePostgres() dbBaser {
 	b := new(dbBasePostgres)
 	b.ins = b
diff --git a/orm/db_sqlite.go b/orm/db_sqlite.go
index efea1967..20a90cde 100644
--- a/orm/db_sqlite.go
+++ b/orm/db_sqlite.go
@@ -19,6 +19,26 @@ var sqliteOperators = map[string]string{
 	"iendswith":   "LIKE ? ESCAPE '\\'",
 }
 
+var sqliteTypes = map[string]string{
+	"auto":            "NOT NULL PRIMARY KEY AUTOINCREMENT",
+	"pk":              "NOT NULL PRIMARY KEY",
+	"bool":            "bool",
+	"string":          "varchar(%d)",
+	"string-text":     "text",
+	"time.Time-date":  "date",
+	"time.Time":       "datetime",
+	"int8":            "tinyint",
+	"int16":           "smallint",
+	"int32":           "integer",
+	"int64":           "bigint",
+	"uint8":           "tinyint unsigned",
+	"uint16":          "smallint unsigned",
+	"uint32":          "integer unsigned",
+	"uint64":          "bigint unsigned",
+	"float64":         "real",
+	"float64-decimal": "decimal",
+}
+
 type dbBaseSqlite struct {
 	dbBase
 }
@@ -43,6 +63,10 @@ func (d *dbBaseSqlite) MaxLimit() uint64 {
 	return 9223372036854775807
 }
 
+func (d *dbBaseSqlite) DbTypes() map[string]string {
+	return sqliteTypes
+}
+
 func newdbBaseSqlite() dbBaser {
 	b := new(dbBaseSqlite)
 	b.ins = b
diff --git a/orm/models.go b/orm/models.go
index 1c2270ce..112183c0 100644
--- a/orm/models.go
+++ b/orm/models.go
@@ -84,3 +84,10 @@ func (mc *_modelCache) set(table string, mi *modelInfo) *modelInfo {
 	}
 	return mii
 }
+
+func (mc *_modelCache) clean() {
+	mc.orders = make([]string, 0)
+	mc.cache = make(map[string]*modelInfo)
+	mc.cacheByFN = make(map[string]*modelInfo)
+	mc.done = false
+}
diff --git a/orm/models_boot.go b/orm/models_boot.go
index fa18d394..33afa701 100644
--- a/orm/models_boot.go
+++ b/orm/models_boot.go
@@ -8,7 +8,7 @@ import (
 	"strings"
 )
 
-func registerModel(model interface{}) {
+func registerModel(model interface{}, prefix string) {
 	val := reflect.ValueOf(model)
 	ind := reflect.Indirect(val)
 	typ := ind.Type()
@@ -17,20 +17,25 @@ func registerModel(model interface{}) {
 		panic(fmt.Sprintf("<orm.RegisterModel> cannot use non-ptr model struct `%s`", getFullName(typ)))
 	}
 
-	info := newModelInfo(val)
+	table := getTableName(val)
+
+	if prefix != "" {
+		table = prefix + table
+	}
 
 	name := getFullName(typ)
 	if _, ok := modelCache.getByFN(name); ok {
-		fmt.Printf("<orm.RegisterModel> model `%s` redeclared, must be unique\n", name)
+		fmt.Printf("<orm.RegisterModel> model `%s` repeat register, must be unique\n", name)
 		os.Exit(2)
 	}
 
-	table := getTableName(val)
 	if _, ok := modelCache.get(table); ok {
-		fmt.Printf("<orm.RegisterModel> table name `%s` redeclared, must be unique\n", table)
+		fmt.Printf("<orm.RegisterModel> table name `%s` repeat register, must be unique\n", table)
 		os.Exit(2)
 	}
 
+	info := newModelInfo(val)
+
 	if info.fields.pk == nil {
 	outFor:
 		for _, fi := range info.fields.fieldsDB {
@@ -58,6 +63,7 @@ func registerModel(model interface{}) {
 	info.pkg = typ.PkgPath()
 	info.model = model
 	info.manual = true
+
 	modelCache.set(table, info)
 }
 
@@ -72,7 +78,7 @@ func bootStrap() {
 	)
 
 	if dataBaseCache.getDefault() == nil {
-		err = fmt.Errorf("must have one register alias named `default`")
+		err = fmt.Errorf("must have one register DataBase alias named `default`")
 		goto end
 	}
 
@@ -97,7 +103,7 @@ func bootStrap() {
 				switch fi.fieldType {
 				case RelManyToMany:
 					if fi.relThrough != "" {
-						msg := fmt.Sprintf("filed `%s` wrong rel_through value `%s`", fi.fullName, fi.relThrough)
+						msg := fmt.Sprintf("field `%s` wrong rel_through value `%s`", fi.fullName, fi.relThrough)
 						if i := strings.LastIndex(fi.relThrough, "."); i != -1 && len(fi.relThrough) > (i+1) {
 							pn := fi.relThrough[:i]
 							mn := fi.relThrough[i+1:]
@@ -238,11 +244,22 @@ end:
 
 func RegisterModel(models ...interface{}) {
 	if modelCache.done {
-		panic(fmt.Errorf("RegisterModel must be run begore BootStrap"))
+		panic(fmt.Errorf("RegisterModel must be run before BootStrap"))
 	}
 
 	for _, model := range models {
-		registerModel(model)
+		registerModel(model, "")
+	}
+}
+
+// register model with a prefix
+func RegisterModelWithPrefix(prefix string, models ...interface{}) {
+	if modelCache.done {
+		panic(fmt.Errorf("RegisterModel must be run before BootStrap"))
+	}
+
+	for _, model := range models {
+		registerModel(model, prefix)
 	}
 }
 
diff --git a/orm/models_fields.go b/orm/models_fields.go
index 269e8580..a5b5937e 100644
--- a/orm/models_fields.go
+++ b/orm/models_fields.go
@@ -31,7 +31,7 @@ const (
 	// int64
 	TypeBigIntegerField
 	// uint8
-	TypePostiveBitField
+	TypePositiveBitField
 	// uint16
 	TypePositiveSmallIntegerField
 	// uint32
diff --git a/orm/models_info_f.go b/orm/models_info_f.go
index 33506829..f3d91474 100644
--- a/orm/models_info_f.go
+++ b/orm/models_info_f.go
@@ -399,7 +399,7 @@ checkType:
 			_, err = v.Int32()
 		case TypeBigIntegerField:
 			_, err = v.Int64()
-		case TypePostiveBitField:
+		case TypePositiveBitField:
 			_, err = v.Uint8()
 		case TypePositiveSmallIntegerField:
 			_, err = v.Uint16()
diff --git a/orm/models_info_m.go b/orm/models_info_m.go
index dfbad42e..31e849b2 100644
--- a/orm/models_info_m.go
+++ b/orm/models_info_m.go
@@ -90,6 +90,9 @@ func newM2MModelInfo(m1, m2 *modelInfo) (info *modelInfo) {
 	fa.auto = true
 	fa.pk = true
 	fa.dbcol = true
+	fa.name = "Id"
+	fa.column = "id"
+	fa.fullName = info.fullName + "." + fa.name
 
 	f1.dbcol = true
 	f2.dbcol = true
diff --git a/orm/models_test.go b/orm/models_test.go
index c9bbce2b..7794ffb0 100644
--- a/orm/models_test.go
+++ b/orm/models_test.go
@@ -3,10 +3,8 @@ package orm
 import (
 	"fmt"
 	"os"
-	"strings"
 	"time"
 
-	// _ "github.com/bylevel/pq"
 	_ "github.com/go-sql-driver/mysql"
 	_ "github.com/lib/pq"
 	_ "github.com/mattn/go-sqlite3"
@@ -153,325 +151,7 @@ var (
 
 var dORM Ormer
 
-var initSQLs = map[string]string{
-	"mysql": "DROP TABLE IF EXISTS `user_profile`;\n" +
-		"DROP TABLE IF EXISTS `user`;\n" +
-		"DROP TABLE IF EXISTS `post`;\n" +
-		"DROP TABLE IF EXISTS `tag`;\n" +
-		"DROP TABLE IF EXISTS `post_tags`;\n" +
-		"DROP TABLE IF EXISTS `comment`;\n" +
-		"DROP TABLE IF EXISTS `data`;\n" +
-		"DROP TABLE IF EXISTS `data_null`;\n" +
-		"CREATE TABLE `user_profile` (\n" +
-		"    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,\n" +
-		"    `age` smallint NOT NULL,\n" +
-		"    `money` double precision NOT NULL\n" +
-		") ENGINE=INNODB;\n" +
-		"CREATE TABLE `user` (\n" +
-		"    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,\n" +
-		"    `user_name` varchar(30) NOT NULL UNIQUE,\n" +
-		"    `email` varchar(100) NOT NULL,\n" +
-		"    `password` varchar(100) NOT NULL,\n" +
-		"    `status` smallint NOT NULL,\n" +
-		"    `is_staff` bool NOT NULL,\n" +
-		"    `is_active` bool NOT NULL,\n" +
-		"    `created` date NOT NULL,\n" +
-		"    `updated` datetime NOT NULL,\n" +
-		"    `profile_id` integer\n" +
-		") ENGINE=INNODB;\n" +
-		"CREATE TABLE `post` (\n" +
-		"    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,\n" +
-		"    `user_id` integer NOT NULL,\n" +
-		"    `title` varchar(60) NOT NULL,\n" +
-		"    `content` longtext NOT NULL,\n" +
-		"    `created` datetime NOT NULL,\n" +
-		"    `updated` datetime NOT NULL\n" +
-		") ENGINE=INNODB;\n" +
-		"CREATE TABLE `tag` (\n" +
-		"    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,\n" +
-		"    `name` varchar(30) NOT NULL\n" +
-		") ENGINE=INNODB;\n" +
-		"CREATE TABLE `post_tags` (\n" +
-		"    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,\n" +
-		"    `post_id` integer NOT NULL,\n" +
-		"    `tag_id` integer NOT NULL,\n" +
-		"    UNIQUE (`post_id`, `tag_id`)\n" +
-		") ENGINE=INNODB;\n" +
-		"CREATE TABLE `comment` (\n" +
-		"    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,\n" +
-		"    `post_id` integer NOT NULL,\n" +
-		"    `content` longtext NOT NULL,\n" +
-		"    `parent_id` integer,\n" +
-		"    `created` datetime NOT NULL\n" +
-		") ENGINE=INNODB;\n" +
-		"CREATE TABLE `data` (\n" +
-		"    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,\n" +
-		"    `boolean` bool NOT NULL,\n" +
-		"    `char` varchar(50) NOT NULL,\n" +
-		"    `text` longtext NOT NULL,\n" +
-		"    `date` date NOT NULL,\n" +
-		"    `date_time` datetime NOT NULL,\n" +
-		"    `byte` tinyint unsigned NOT NULL,\n" +
-		"    `rune` integer NOT NULL,\n" +
-		"    `int` integer NOT NULL,\n" +
-		"    `int8` tinyint NOT NULL,\n" +
-		"    `int16` smallint NOT NULL,\n" +
-		"    `int32` integer NOT NULL,\n" +
-		"    `int64` bigint NOT NULL,\n" +
-		"    `uint` integer unsigned NOT NULL,\n" +
-		"    `uint8` tinyint unsigned NULL,\n" +
-		"    `uint16` smallint unsigned NOT NULL,\n" +
-		"    `uint32` integer unsigned NOT NULL,\n" +
-		"    `uint64` bigint unsigned NOT NULL,\n" +
-		"    `float32` double precision NOT NULL,\n" +
-		"    `float64` double precision NOT NULL,\n" +
-		"    `decimal` numeric(8,4) NOT NULL\n" +
-		") ENGINE=INNODB;\n" +
-		"CREATE TABLE `data_null` (\n" +
-		"    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,\n" +
-		"    `boolean` bool,\n" +
-		"    `char` varchar(50),\n" +
-		"    `text` longtext,\n" +
-		"    `date` date,\n" +
-		"    `date_time` datetime,\n" +
-		"    `byte` tinyint unsigned,\n" +
-		"    `rune` integer,\n" +
-		"    `int` integer,\n" +
-		"    `int8` tinyint,\n" +
-		"    `int16` smallint,\n" +
-		"    `int32` integer,\n" +
-		"    `int64` bigint,\n" +
-		"    `uint` integer unsigned,\n" +
-		"    `uint8` tinyint unsigned,\n" +
-		"    `uint16` smallint unsigned,\n" +
-		"    `uint32` integer unsigned,\n" +
-		"    `uint64` bigint unsigned,\n" +
-		"    `float32` double precision,\n" +
-		"    `float64` double precision,\n" +
-		"    `decimal` numeric(8,4)\n" +
-		") ENGINE=INNODB;\n" +
-		"CREATE INDEX `user_141c6eec` ON `user` (`profile_id`);\n" +
-		"CREATE INDEX `post_fbfc09f1` ON `post` (`user_id`);\n" +
-		"CREATE INDEX `comment_699ae8ca` ON `comment` (`post_id`);\n" +
-		"CREATE INDEX `comment_63f17a16` ON `comment` (`parent_id`);",
-
-	"sqlite3": `
-DROP TABLE IF EXISTS "user_profile";
-DROP TABLE IF EXISTS "user";
-DROP TABLE IF EXISTS "post";
-DROP TABLE IF EXISTS "tag";
-DROP TABLE IF EXISTS "post_tags";
-DROP TABLE IF EXISTS "comment";
-DROP TABLE IF EXISTS "data";
-DROP TABLE IF EXISTS "data_null";
-CREATE TABLE "user_profile" (
-    "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
-    "age" smallint NOT NULL,
-    "money" real NOT NULL
-);
-CREATE TABLE "user" (
-    "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
-    "user_name" varchar(30) NOT NULL UNIQUE,
-    "email" varchar(100) NOT NULL,
-    "password" varchar(100) NOT NULL,
-    "status" smallint NOT NULL,
-    "is_staff" bool NOT NULL,
-    "is_active" bool NOT NULL,
-    "created" date NOT NULL,
-    "updated" datetime NOT NULL,
-    "profile_id" integer
-);
-CREATE TABLE "post" (
-    "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
-    "user_id" integer NOT NULL,
-    "title" varchar(60) NOT NULL,
-    "content" text NOT NULL,
-    "created" datetime NOT NULL,
-    "updated" datetime NOT NULL
-);
-CREATE TABLE "tag" (
-    "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
-    "name" varchar(30) NOT NULL
-);
-CREATE TABLE "post_tags" (
-    "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
-    "post_id" integer NOT NULL,
-    "tag_id" integer NOT NULL,
-    UNIQUE ("post_id", "tag_id")
-);
-CREATE TABLE "comment" (
-    "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
-    "post_id" integer NOT NULL,
-    "content" text NOT NULL,
-    "parent_id" integer,
-    "created" datetime NOT NULL
-);
-CREATE TABLE "data" (
-    "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
-    "boolean" bool NOT NULL,
-    "char" varchar(50) NOT NULL,
-    "text" text NOT NULL,
-    "date" date NOT NULL,
-    "date_time" datetime NOT NULL,
-    "byte" tinyint unsigned NOT NULL,
-    "rune" integer NOT NULL,
-    "int" integer NOT NULL,
-    "int8" tinyint NOT NULL,
-    "int16" smallint NOT NULL,
-    "int32" integer NOT NULL,
-    "int64" bigint NOT NULL,
-    "uint" integer unsigned NOT NULL,
-    "uint8" tinyint unsigned NOT NULL,
-    "uint16" smallint unsigned NOT NULL,
-    "uint32" integer unsigned NOT NULL,
-    "uint64" bigint unsigned NOT NULL,
-    "float32" real NOT NULL,
-    "float64" real NOT NULL,
-    "decimal" decimal
-);
-CREATE TABLE "data_null" (
-    "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
-    "boolean" bool,
-    "char" varchar(50),
-    "text" text,
-    "date" date,
-    "date_time" datetime,
-    "byte" tinyint unsigned,
-    "rune" integer,
-    "int" integer,
-    "int8" tinyint,
-    "int16" smallint,
-    "int32" integer,
-    "int64" bigint,
-    "uint" integer unsigned,
-    "uint8" tinyint unsigned,
-    "uint16" smallint unsigned,
-    "uint32" integer unsigned,
-    "uint64" bigint unsigned,
-    "float32" real,
-    "float64" real,
-    "decimal" decimal
-);
-CREATE INDEX "user_141c6eec" ON "user" ("profile_id");
-CREATE INDEX "post_fbfc09f1" ON "post" ("user_id");
-CREATE INDEX "comment_699ae8ca" ON "comment" ("post_id");
-CREATE INDEX "comment_63f17a16" ON "comment" ("parent_id");
-`,
-
-	"postgres": `
-DROP TABLE IF EXISTS "user_profile";
-DROP TABLE IF EXISTS "user";
-DROP TABLE IF EXISTS "post";
-DROP TABLE IF EXISTS "tag";
-DROP TABLE IF EXISTS "post_tags";
-DROP TABLE IF EXISTS "comment";
-DROP TABLE IF EXISTS "data";
-DROP TABLE IF EXISTS "data_null";
-CREATE TABLE "user_profile" (
-    "id" serial NOT NULL PRIMARY KEY,
-    "age" smallint NOT NULL,
-    "money" double precision NOT NULL
-);
-CREATE TABLE "user" (
-    "id" serial NOT NULL PRIMARY KEY,
-    "user_name" varchar(30) NOT NULL UNIQUE,
-    "email" varchar(100) NOT NULL,
-    "password" varchar(100) NOT NULL,
-    "status" smallint NOT NULL,
-    "is_staff" boolean NOT NULL,
-    "is_active" boolean NOT NULL,
-    "created" date NOT NULL,
-    "updated" timestamp with time zone NOT NULL,
-    "profile_id" integer
-);
-CREATE TABLE "post" (
-    "id" serial NOT NULL PRIMARY KEY,
-    "user_id" integer NOT NULL,
-    "title" varchar(60) NOT NULL,
-    "content" text NOT NULL,
-    "created" timestamp with time zone NOT NULL,
-    "updated" timestamp with time zone NOT NULL
-);
-CREATE TABLE "tag" (
-    "id" serial NOT NULL PRIMARY KEY,
-    "name" varchar(30) NOT NULL
-);
-CREATE TABLE "post_tags" (
-    "id" serial NOT NULL PRIMARY KEY,
-    "post_id" integer NOT NULL,
-    "tag_id" integer NOT NULL,
-    UNIQUE ("post_id", "tag_id")
-);
-CREATE TABLE "comment" (
-    "id" serial NOT NULL PRIMARY KEY,
-    "post_id" integer NOT NULL,
-    "content" text NOT NULL,
-    "parent_id" integer,
-    "created" timestamp with time zone NOT NULL
-);
-CREATE TABLE "data" (
-    "id" serial NOT NULL PRIMARY KEY,
-    "boolean" bool NOT NULL,
-    "char" varchar(50) NOT NULL,
-    "text" text NOT NULL,
-    "date" date NOT NULL,
-    "date_time" timestamp with time zone NOT NULL,
-    "byte" smallint CHECK("byte" >= 0 AND "byte" <= 255) NOT NULL,
-    "rune" integer NOT NULL,
-    "int" integer NOT NULL,
-    "int8" smallint CHECK("int8" >= -127 AND "int8" <= 128) NOT NULL,
-    "int16" smallint NOT NULL,
-    "int32" integer NOT NULL,
-    "int64" bigint NOT NULL,
-    "uint" bigint CHECK("uint" >= 0) NOT NULL,
-    "uint8" smallint CHECK("uint8" >= 0 AND "uint8" <= 255) NOT NULL,
-    "uint16" integer CHECK("uint16" >= 0) NOT NULL,
-    "uint32" bigint CHECK("uint32" >= 0) NOT NULL,
-    "uint64" bigint CHECK("uint64" >= 0) NOT NULL,
-    "float32" double precision NOT NULL,
-    "float64" double precision NOT NULL,
-    "decimal" numeric(8, 4)
-);
-CREATE TABLE "data_null" (
-    "id" serial NOT NULL PRIMARY KEY,
-    "boolean" bool,
-    "char" varchar(50),
-    "text" text,
-    "date" date,
-    "date_time" timestamp with time zone,
-    "byte" smallint CHECK("byte" >= 0 AND "byte" <= 255),
-    "rune" integer,
-    "int" integer,
-    "int8" smallint CHECK("int8" >= -127 AND "int8" <= 128),
-    "int16" smallint,
-    "int32" integer,
-    "int64" bigint,
-    "uint" bigint CHECK("uint" >= 0),
-    "uint8" smallint CHECK("uint8" >= 0 AND "uint8" <= 255),
-    "uint16" integer CHECK("uint16" >= 0),
-    "uint32" bigint CHECK("uint32" >= 0),
-    "uint64" bigint CHECK("uint64" >= 0),
-    "float32" double precision,
-    "float64" double precision,
-    "decimal" numeric(8, 4)
-);
-CREATE INDEX "user_profile_id" ON "user" ("profile_id");
-CREATE INDEX "post_user_id" ON "post" ("user_id");
-CREATE INDEX "comment_post_id" ON "comment" ("post_id");
-CREATE INDEX "comment_parent_id" ON "comment" ("parent_id");
-`}
-
 func init() {
-	// err := os.Setenv("TZ", "+00:00")
-	// fmt.Println(err)
-
-	RegisterModel(new(Data), new(DataNull))
-	RegisterModel(new(User))
-	RegisterModel(new(Profile))
-	RegisterModel(new(Post))
-	RegisterModel(new(Tag))
-	RegisterModel(new(Comment))
-
 	Debug, _ = StrTo(DBARGS.Debug).Bool()
 
 	if DBARGS.Driver == "" || DBARGS.Source == "" {
@@ -484,29 +164,35 @@ Default DB Drivers.
  sqlite3: https://github.com/mattn/go-sqlite3
 postgres: https://github.com/lib/pq
 
-eg: mysql
-ORM_DRIVER=mysql ORM_SOURCE="root:root@/my_db?charset=utf8" go test github.com/astaxie/beego/orm
+usage:
+
+go get -u github.com/astaxie/beego/orm
+go get -u github.com/go-sql-driver/mysql
+go get -u github.com/mattn/go-sqlite3
+go get -u github.com/lib/pq
+
+#### MySQL
+mysql -u root -e 'create database orm_test;'
+export ORM_DRIVER=mysql
+export ORM_SOURCE="root:@/orm_test?charset=utf8"
+go test -v github.com/astaxie/beego/orm
+
+
+#### Sqlite3
+touch /path/to/orm_test.db
+export ORM_DRIVER=sqlite3
+export ORM_SOURCE=/path/to/orm_test.db
+go test -v github.com/astaxie/beego/orm
+
+
+#### PostgreSQL
+psql -c 'create database orm_test;' -U postgres
+export ORM_DRIVER=postgres
+export ORM_SOURCE="user=postgres dbname=orm_test sslmode=disable"
+go test -v github.com/astaxie/beego/orm
 `)
 		os.Exit(2)
 	}
 
 	RegisterDataBase("default", DBARGS.Driver, DBARGS.Source, 20)
-
-	BootStrap()
-
-	dORM = NewOrm()
-
-	queries := strings.Split(initSQLs[DBARGS.Driver], ";")
-
-	for _, query := range queries {
-		query = strings.TrimSpace(query)
-		if len(query) == 0 {
-			continue
-		}
-		_, err := dORM.Raw(query).Exec()
-		if err != nil {
-			fmt.Println(err)
-			os.Exit(2)
-		}
-	}
 }
diff --git a/orm/models_utils.go b/orm/models_utils.go
index fe9cb965..d4677a76 100644
--- a/orm/models_utils.go
+++ b/orm/models_utils.go
@@ -52,7 +52,7 @@ func getFieldType(val reflect.Value) (ft int, err error) {
 	case reflect.Int64:
 		ft = TypeBigIntegerField
 	case reflect.Uint8:
-		ft = TypePostiveBitField
+		ft = TypePositiveBitField
 	case reflect.Uint16:
 		ft = TypePositiveSmallIntegerField
 	case reflect.Uint32, reflect.Uint:
diff --git a/orm/orm_test.go b/orm/orm_test.go
index cd3289e3..0346c1be 100644
--- a/orm/orm_test.go
+++ b/orm/orm_test.go
@@ -189,6 +189,47 @@ func throwFailNow(t *testing.T, err error, args ...interface{}) {
 	}
 }
 
+func TestSyncDb(t *testing.T) {
+	RegisterModel(new(Data), new(DataNull))
+	RegisterModel(new(User))
+	RegisterModel(new(Profile))
+	RegisterModel(new(Post))
+	RegisterModel(new(Tag))
+	RegisterModel(new(Comment))
+
+	BootStrap()
+
+	al := dataBaseCache.getDefault()
+	db := al.DB
+
+	drops := getDbDropSql(al)
+	for _, query := range drops {
+		_, err := db.Exec(query)
+		throwFailNow(t, err, query)
+	}
+
+	tables := getDbCreateSql(al)
+	for _, query := range tables {
+		_, err := db.Exec(query)
+		throwFailNow(t, err, query)
+	}
+
+	modelCache.clean()
+}
+
+func TestRegisterModels(t *testing.T) {
+	RegisterModel(new(Data), new(DataNull))
+	RegisterModel(new(User))
+	RegisterModel(new(Profile))
+	RegisterModel(new(Post))
+	RegisterModel(new(Tag))
+	RegisterModel(new(Comment))
+
+	BootStrap()
+
+	dORM = NewOrm()
+}
+
 func TestModelSyntax(t *testing.T) {
 	user := &User{}
 	ind := reflect.ValueOf(user).Elem()
diff --git a/orm/types.go b/orm/types.go
index d20a4df8..b4fd5c84 100644
--- a/orm/types.go
+++ b/orm/types.go
@@ -132,4 +132,5 @@ type dbBaser interface {
 	HasReturningID(*modelInfo, *string) bool
 	TimeFromDB(*time.Time, *time.Location)
 	TimeToDB(*time.Time, *time.Location)
+	DbTypes() map[string]string
 }