diff --git a/engine.go b/engine.go
index a27b6bdf..533e1930 100644
--- a/engine.go
+++ b/engine.go
@@ -924,6 +924,7 @@ func (engine *Engine) mapType(v reflect.Value) (*core.Table, error) {
 
 					k := strings.ToUpper(key)
 					ctx.tagName = k
+					ctx.params = []string{}
 
 					pStart := strings.Index(k, "(")
 					if pStart == 0 {
@@ -1223,8 +1224,10 @@ func (engine *Engine) Sync(beans ...interface{}) error {
 				}
 				if !isExist {
 					session := engine.NewSession()
-					session.Statement.setRefValue(v)
 					defer session.Close()
+					if err := session.Statement.setRefValue(v); err != nil {
+						return err
+					}
 					err = session.addColumn(col.Name)
 					if err != nil {
 						return err
@@ -1234,8 +1237,10 @@ func (engine *Engine) Sync(beans ...interface{}) error {
 
 			for name, index := range table.Indexes {
 				session := engine.NewSession()
-				session.Statement.setRefValue(v)
 				defer session.Close()
+				if err := session.Statement.setRefValue(v); err != nil {
+					return err
+				}
 				if index.Type == core.UniqueType {
 					//isExist, err := session.isIndexExist(table.Name, name, true)
 					isExist, err := session.isIndexExist2(tableName, index.Cols, true)
@@ -1244,8 +1249,11 @@ func (engine *Engine) Sync(beans ...interface{}) error {
 					}
 					if !isExist {
 						session := engine.NewSession()
-						session.Statement.setRefValue(v)
 						defer session.Close()
+						if err := session.Statement.setRefValue(v); err != nil {
+							return err
+						}
+
 						err = session.addUnique(tableName, name)
 						if err != nil {
 							return err
@@ -1258,8 +1266,11 @@ func (engine *Engine) Sync(beans ...interface{}) error {
 					}
 					if !isExist {
 						session := engine.NewSession()
-						session.Statement.setRefValue(v)
 						defer session.Close()
+						if err := session.Statement.setRefValue(v); err != nil {
+							return err
+						}
+
 						err = session.addIndex(tableName, name)
 						if err != nil {
 							return err
diff --git a/rows.go b/rows.go
index a91d08b7..47bc322f 100644
--- a/rows.go
+++ b/rows.go
@@ -34,7 +34,10 @@ func newRows(session *Session, bean interface{}) (*Rows, error) {
 	var sqlStr string
 	var args []interface{}
 
-	rows.session.Statement.setRefValue(rValue(bean))
+	if err := rows.session.Statement.setRefValue(rValue(bean)); err != nil {
+		return nil, err
+	}
+
 	if len(session.Statement.TableName()) <= 0 {
 		return nil, ErrTableNotFound
 	}
@@ -113,7 +116,9 @@ func (rows *Rows) Scan(bean interface{}) error {
 	}
 
 	dataStruct := rValue(bean)
-	rows.session.Statement.setRefValue(dataStruct)
+	if err := rows.session.Statement.setRefValue(dataStruct); err != nil {
+		return err
+	}
 	_, err := rows.session.row2Bean(rows.rows, rows.fields, len(rows.fields), bean, &dataStruct, rows.session.Statement.RefTable)
 
 	return err
diff --git a/session_delete.go b/session_delete.go
index 1c458fe1..0c1e705e 100644
--- a/session_delete.go
+++ b/session_delete.go
@@ -83,7 +83,9 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 		defer session.Close()
 	}
 
-	session.Statement.setRefValue(rValue(bean))
+	if err := session.Statement.setRefValue(rValue(bean)); err != nil {
+		return 0, err
+	}
 	var table = session.Statement.RefTable
 
 	// handle before delete processors
diff --git a/session_find.go b/session_find.go
index 61862edd..16c6ff4f 100644
--- a/session_find.go
+++ b/session_find.go
@@ -41,13 +41,17 @@ func (session *Session) Find(rowsSlicePtr interface{}, condiBean ...interface{})
 		if sliceElementType.Kind() == reflect.Ptr {
 			if sliceElementType.Elem().Kind() == reflect.Struct {
 				pv := reflect.New(sliceElementType.Elem())
-				session.Statement.setRefValue(pv.Elem())
+				if err := session.Statement.setRefValue(pv.Elem()); err != nil {
+					return err
+				}
 			} else {
 				tp = tpNonStruct
 			}
 		} else if sliceElementType.Kind() == reflect.Struct {
 			pv := reflect.New(sliceElementType)
-			session.Statement.setRefValue(pv.Elem())
+			if err := session.Statement.setRefValue(pv.Elem()); err != nil {
+				return err
+			}
 		} else {
 			tp = tpNonStruct
 		}
diff --git a/session_get.go b/session_get.go
index bf61963c..c7c03d90 100644
--- a/session_get.go
+++ b/session_get.go
@@ -26,7 +26,9 @@ func (session *Session) Get(bean interface{}) (bool, error) {
 	}
 
 	if beanValue.Elem().Kind() == reflect.Struct {
-		session.Statement.setRefValue(beanValue.Elem())
+		if err := session.Statement.setRefValue(beanValue.Elem()); err != nil {
+			return false, err
+		}
 	}
 
 	var sqlStr string
@@ -81,7 +83,9 @@ func (session *Session) nocacheGet(beanKind reflect.Kind, bean interface{}, sqlS
 				return true, err
 			}
 			dataStruct := rValue(bean)
-			session.Statement.setRefValue(dataStruct)
+			if err := session.Statement.setRefValue(dataStruct); err != nil {
+				return false, err
+			}
 			_, err = session.row2Bean(rawRows, fields, len(fields), bean, &dataStruct, session.Statement.RefTable)
 		case reflect.Slice:
 			err = rawRows.ScanSlice(bean)
diff --git a/session_insert.go b/session_insert.go
index 5b607b1f..2c8ad782 100644
--- a/session_insert.go
+++ b/session_insert.go
@@ -67,7 +67,9 @@ func (session *Session) innerInsertMulti(rowsSlicePtr interface{}) (int64, error
 		return 0, errors.New("could not insert a empty slice")
 	}
 
-	session.Statement.setRefValue(sliceValue.Index(0))
+	if err := session.Statement.setRefValue(sliceValue.Index(0)); err != nil {
+		return 0, err
+	}
 
 	if len(session.Statement.TableName()) <= 0 {
 		return 0, ErrTableNotFound
@@ -217,19 +219,19 @@ func (session *Session) innerInsertMulti(rowsSlicePtr interface{}) (int64, error
 		temp := fmt.Sprintf(") INTO %s (%v%v%v) VALUES (",
 			session.Engine.Quote(session.Statement.TableName()),
 			session.Engine.QuoteStr(),
-			strings.Join(colNames, session.Engine.QuoteStr() + ", " + session.Engine.QuoteStr()),
+			strings.Join(colNames, session.Engine.QuoteStr()+", "+session.Engine.QuoteStr()),
 			session.Engine.QuoteStr())
 		statement = fmt.Sprintf(sql,
 			session.Engine.Quote(session.Statement.TableName()),
 			session.Engine.QuoteStr(),
-			strings.Join(colNames, session.Engine.QuoteStr() + ", " + session.Engine.QuoteStr()),
+			strings.Join(colNames, session.Engine.QuoteStr()+", "+session.Engine.QuoteStr()),
 			session.Engine.QuoteStr(),
 			strings.Join(colMultiPlaces, temp))
 	} else {
 		statement = fmt.Sprintf(sql,
 			session.Engine.Quote(session.Statement.TableName()),
 			session.Engine.QuoteStr(),
-			strings.Join(colNames, session.Engine.QuoteStr() + ", " + session.Engine.QuoteStr()),
+			strings.Join(colNames, session.Engine.QuoteStr()+", "+session.Engine.QuoteStr()),
 			session.Engine.QuoteStr(),
 			strings.Join(colMultiPlaces, "),("))
 	}
@@ -297,7 +299,9 @@ func (session *Session) InsertMulti(rowsSlicePtr interface{}) (int64, error) {
 }
 
 func (session *Session) innerInsert(bean interface{}) (int64, error) {
-	session.Statement.setRefValue(rValue(bean))
+	if err := session.Statement.setRefValue(rValue(bean)); err != nil {
+		return 0, err
+	}
 	if len(session.Statement.TableName()) <= 0 {
 		return 0, ErrTableNotFound
 	}
@@ -325,8 +329,8 @@ func (session *Session) innerInsert(bean interface{}) (int64, error) {
 		// remove the expr columns
 		for i, colName := range colNames {
 			if colName == v.colName {
-				colNames = append(colNames[:i], colNames[i + 1:]...)
-				args = append(args[:i], args[i + 1:]...)
+				colNames = append(colNames[:i], colNames[i+1:]...)
+				args = append(args[:i], args[i+1:]...)
 			}
 		}
 
@@ -335,11 +339,11 @@ func (session *Session) innerInsert(bean interface{}) (int64, error) {
 		exprColVals = append(exprColVals, v.expr)
 	}
 
-	colPlaces := strings.Repeat("?, ", len(colNames) - len(exprColumns))
+	colPlaces := strings.Repeat("?, ", len(colNames)-len(exprColumns))
 	if len(exprColVals) > 0 {
 		colPlaces = colPlaces + strings.Join(exprColVals, ", ")
 	} else {
-		colPlaces = colPlaces[0 : len(colPlaces) - 2]
+		colPlaces = colPlaces[0 : len(colPlaces)-2]
 	}
 
 	sqlStr := fmt.Sprintf("INSERT INTO %s (%v%v%v) VALUES (%v)",
diff --git a/session_schema.go b/session_schema.go
index 21fa2996..19c0cbf5 100644
--- a/session_schema.go
+++ b/session_schema.go
@@ -27,7 +27,9 @@ func (session *Session) Ping() error {
 // CreateTable create a table according a bean
 func (session *Session) CreateTable(bean interface{}) error {
 	v := rValue(bean)
-	session.Statement.setRefValue(v)
+	if err := session.Statement.setRefValue(v); err != nil {
+		return err
+	}
 
 	defer session.resetStatement()
 	if session.IsAutoClose {
@@ -40,7 +42,9 @@ func (session *Session) CreateTable(bean interface{}) error {
 // CreateIndexes create indexes
 func (session *Session) CreateIndexes(bean interface{}) error {
 	v := rValue(bean)
-	session.Statement.setRefValue(v)
+	if err := session.Statement.setRefValue(v); err != nil {
+		return err
+	}
 
 	defer session.resetStatement()
 	if session.IsAutoClose {
@@ -60,7 +64,9 @@ func (session *Session) CreateIndexes(bean interface{}) error {
 // CreateUniques create uniques
 func (session *Session) CreateUniques(bean interface{}) error {
 	v := rValue(bean)
-	session.Statement.setRefValue(v)
+	if err := session.Statement.setRefValue(v); err != nil {
+		return err
+	}
 
 	defer session.resetStatement()
 	if session.IsAutoClose {
@@ -104,7 +110,9 @@ func (session *Session) createAll() error {
 // DropIndexes drop indexes
 func (session *Session) DropIndexes(bean interface{}) error {
 	v := rValue(bean)
-	session.Statement.setRefValue(v)
+	if err := session.Statement.setRefValue(v); err != nil {
+		return err
+	}
 
 	defer session.resetStatement()
 	if session.IsAutoClose {
diff --git a/session_update.go b/session_update.go
index 0f2d1b5c..1d77d294 100644
--- a/session_update.go
+++ b/session_update.go
@@ -169,7 +169,9 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 	var isMap = t.Kind() == reflect.Map
 	var isStruct = t.Kind() == reflect.Struct
 	if isStruct {
-		session.Statement.setRefValue(v)
+		if err := session.Statement.setRefValue(v); err != nil {
+			return 0, err
+		}
 
 		if len(session.Statement.TableName()) <= 0 {
 			return 0, ErrTableNotFound