Implement DML func and related tests

cache.go

@@ -23,13 +23,13 @@ func NewOrmCache(tables []*Table) *OrmCache {
 func (o *OrmCache) add(table *Table) {
 	o.mu.Lock()
 	defer o.mu.Unlock()
-	o.data[table.TypeName] = table
+	o.data[table.Type.Name()] = table
 }
 
-func (o *OrmCache) Get(tableName string) (*Table, bool) {
+func (o *OrmCache) Get(typeName string) (*Table, bool) {
 	o.mu.RLock()
 	defer o.mu.RUnlock()
-	table, ok := o.data[tableName]
+	table, ok := o.data[typeName]
 	return table, ok
 }