diff --git a/engine.go b/engine.go
index 51d750aa..44815f9f 100644
--- a/engine.go
+++ b/engine.go
@@ -373,12 +373,14 @@ func (engine *Engine) DumpAll(w io.Writer) error {
 				} else if col.SQLType.IsText() || col.SQLType.IsTime() {
 					var v = fmt.Sprintf("%s", d)
 					temp += ", '" + strings.Replace(v, "'", "''", -1) + "'"
-				} else if col.SQLType.IsBlob() /**/ {
+				} else if col.SQLType.IsBlob() {
 					if reflect.TypeOf(d).Kind() == reflect.Slice {
 						temp += fmt.Sprintf(", %s", engine.dialect.FormatBytes(d.([]byte)))
 					} else if reflect.TypeOf(d).Kind() == reflect.String {
 						temp += fmt.Sprintf(", '%s'", d.(string))
 					}
+				} else if col.SQLType.IsNumeric() {
+					temp += fmt.Sprintf(", %s", string(d.([]byte)))
 				} else {
 					s := fmt.Sprintf("%v", d)
 					if strings.Contains(s, ":") || strings.Contains(s, "-") {
@@ -1116,19 +1118,22 @@ func (engine *Engine) Sync2(beans ...interface{}) error {
 				}
 
 				if oriCol != nil {
-					if col.SQLType.Name != oriCol.SQLType.Name {
-						if col.SQLType.Name == core.Text &&
-							oriCol.SQLType.Name == core.Varchar {
+					expectedType := engine.dialect.SqlType(col)
+					//curType := oriCol.SQLType.Name
+					curType := engine.dialect.SqlType(oriCol)
+					if expectedType != curType {
+						if expectedType == core.Text &&
+							curType == core.Varchar {
 							// currently only support mysql
 							if engine.dialect.DBType() == core.MYSQL {
 								_, err = engine.Exec(engine.dialect.ModifyColumnSql(table.Name, col))
 							} else {
 								engine.LogWarnf("Table %s Column %s db type is %s, struct type is %s\n",
-									table.Name, col.Name, oriCol.SQLType.Name, col.SQLType.Name)
+									table.Name, col.Name, curType, expectedType)
 							}
 						} else {
 							engine.LogWarnf("Table %s Column %s db type is %s, struct type is %s",
-								table.Name, col.Name, oriCol.SQLType.Name, col.SQLType.Name)
+								table.Name, col.Name, curType, expectedType)
 						}
 					}
 					if col.Default != oriCol.Default {
diff --git a/mssql_dialect.go b/mssql_dialect.go
index 5cd2f52b..eee50795 100644
--- a/mssql_dialect.go
+++ b/mssql_dialect.go
@@ -168,7 +168,7 @@ where a.object_id=object_id('` + tableName + `')`
 			}
 		}
 
-		if col.SQLType.IsText() {
+		if col.SQLType.IsText() || col.SQLType.IsTime() {
 			if col.Default != "" {
 				col.Default = "'" + col.Default + "'"
 			} else {
diff --git a/mysql_dialect.go b/mysql_dialect.go
index 479e6347..ee1f4e06 100644
--- a/mysql_dialect.go
+++ b/mysql_dialect.go
@@ -60,7 +60,7 @@ func (db *mysql) SqlType(c *core.Column) string {
 		for v, _ := range c.EnumOptions {
 			opts += fmt.Sprintf(",'%v'", v)
 		}
-		res += strings.TrimLeft(opts,",")
+		res += strings.TrimLeft(opts, ",")
 		res += ")"
 	case core.Set: //mysql set
 		res = core.Set
@@ -69,7 +69,7 @@ func (db *mysql) SqlType(c *core.Column) string {
 		for v, _ := range c.SetOptions {
 			opts += fmt.Sprintf(",'%v'", v)
 		}
-		res += strings.TrimLeft(opts,",")
+		res += strings.TrimLeft(opts, ",")
 		res += ")"
 	default:
 		res = t
@@ -78,6 +78,11 @@ func (db *mysql) SqlType(c *core.Column) string {
 	var hasLen1 bool = (c.Length > 0)
 	var hasLen2 bool = (c.Length2 > 0)
 
+	if res == core.BigInt && !hasLen1 && !hasLen2 {
+		c.Length = 20
+		hasLen1 = true
+	}
+
 	if hasLen2 {
 		res += "(" + strconv.Itoa(c.Length) + "," + strconv.Itoa(c.Length2) + ")"
 	} else if hasLen1 {
@@ -223,7 +228,7 @@ func (db *mysql) GetColumns(tableName string) ([]string, map[string]*core.Column
 			col.IsAutoIncrement = true
 		}
 
-		if col.SQLType.IsText() {
+		if col.SQLType.IsText() || col.SQLType.IsTime() {
 			if col.Default != "" {
 				col.Default = "'" + col.Default + "'"
 			} else {
diff --git a/oracle_dialect.go b/oracle_dialect.go
index e23ab297..57da2c50 100644
--- a/oracle_dialect.go
+++ b/oracle_dialect.go
@@ -158,7 +158,7 @@ func (db *oracle) GetColumns(tableName string) ([]string, map[string]*core.Colum
 
 		col.Length = dataLen
 
-		if col.SQLType.IsText() {
+		if col.SQLType.IsText() || col.SQLType.IsTime() {
 			if col.Default != "" {
 				col.Default = "'" + col.Default + "'"
 			} else {
diff --git a/postgres_dialect.go b/postgres_dialect.go
index 61d4f1e2..fcdd1fd1 100644
--- a/postgres_dialect.go
+++ b/postgres_dialect.go
@@ -177,7 +177,8 @@ WHERE c.relkind = 'r'::char AND c.relname = $1 AND f.attnum > 0 ORDER BY f.attnu
 		if err != nil {
 			return nil, nil, err
 		}
-		//fmt.Println(args,colName, isNullable, dataType,maxLenStr, colDefault, numPrecision, numRadix,isPK ,isUnique)
+
+		//fmt.Println(args, colName, isNullable, dataType, maxLenStr, colDefault, numPrecision, numRadix, isPK, isUnique)
 		var maxLen int
 		if maxLenStr != nil {
 			maxLen, err = strconv.Atoi(*maxLenStr)
@@ -196,6 +197,10 @@ WHERE c.relkind = 'r'::char AND c.relname = $1 AND f.attnum > 0 ORDER BY f.attnu
 			}
 		}
 
+		if colDefault != nil && strings.HasPrefix(*colDefault, "nextval(") {
+			col.IsAutoIncrement = true
+		}
+
 		col.Nullable = (isNullable == "YES")
 
 		switch dataType {
@@ -220,7 +225,7 @@ WHERE c.relkind = 'r'::char AND c.relname = $1 AND f.attnum > 0 ORDER BY f.attnu
 
 		col.Length = maxLen
 
-		if col.SQLType.IsText() {
+		if col.SQLType.IsText() || col.SQLType.IsTime() {
 			if col.Default != "" {
 				col.Default = "'" + col.Default + "'"
 			} else {
diff --git a/session.go b/session.go
index 91037457..e4c36983 100644
--- a/session.go
+++ b/session.go
@@ -997,9 +997,8 @@ func (session *Session) Get(bean interface{}) (bool, error) {
 			err = session.row2Bean(rawRows, fields, len(fields), bean)
 		}
 		return true, err
-	} else {
-		return false, nil
 	}
+	return false, nil
 }
 
 // Count counts the records. bean's non-empty fields
diff --git a/sqlite3_dialect.go b/sqlite3_dialect.go
index ddf6a5f2..e8d6cf2c 100644
--- a/sqlite3_dialect.go
+++ b/sqlite3_dialect.go
@@ -84,6 +84,21 @@ func (db *sqlite3) TableCheckSql(tableName string) (string, []interface{}) {
 	return "SELECT name FROM sqlite_master WHERE type='table' and name = ?", args
 }
 
+func (db *sqlite3) DropIndexSql(tableName string, index *core.Index) string {
+	quote := db.Quote
+	//var unique string
+	var idxName string = index.Name
+	if !strings.HasPrefix(idxName, "UQE_") &&
+		!strings.HasPrefix(idxName, "IDX_") {
+		if index.Type == core.UniqueType {
+			idxName = fmt.Sprintf("UQE_%v_%v", tableName, index.Name)
+		} else {
+			idxName = fmt.Sprintf("IDX_%v_%v", tableName, index.Name)
+		}
+	}
+	return fmt.Sprintf("DROP INDEX %v", quote(idxName))
+}
+
 /*func (db *sqlite3) ColumnCheckSql(tableName, colName string) (string, []interface{}) {
 	args := []interface{}{tableName}
 	sql := "SELECT name FROM sqlite_master WHERE type='table' and name = ? and ((sql like '%`" + colName + "`%') or (sql like '%[" + colName + "]%'))"