MyBatis General Mapper Source Code analysis (II.)

1.javabean Property value Generation SQL

  /*** Get all query columns, such as Id,name,code ... *@paramEntityclass *@return     */     Public StaticString Getallcolumns (class<?>Entityclass) {Set<EntityColumn> ColumnSet =Entityhelper.getcolumns (Entityclass); StringBuilder SQL=NewStringBuilder ();  for(Entitycolumn entitycolumn:columnset) {sql.append (Entitycolumn.getcolumn ()). Append (","); }        returnSql.substring (0, Sql.length ()-1); }

  /*** Determine the conditional structure of automatic ==null * *@paramEntityName *@paramcolumn *@paramContents *@paramEmpty *@return     */     Public StaticString Getifisnull (String entityname, entitycolumn column, string contents,Booleanempty) {StringBuilder SQL=NewStringBuilder (); Sql.append ("<if test=\" "); if(Stringutil.isnotempty (entityname)) {sql.append (EntityName). Append ("."); } sql.append (Column.getproperty ()). Append ("= = NULL"); if(Empty && Column.getjavatype (). Equals (String.class) {sql.append ("or"); if(Stringutil.isnotempty (entityname)) {sql.append (EntityName). Append ("."); } sql.append (Column.getproperty ()). Append ("= =" "); } sql.append ("\" > ");        Sql.append (contents); Sql.append ("</if>"); returnsql.tostring (); }

MyBatis General Mapper Source Code analysis (II.)