sql insert statement being given column name 'XXX' is invalid

My question is inserted into the String data type, an error. After solving summary

1. 　

   insert into table (1 column names, column names ...... 2) values ​​( 'string 1', 'string 2', .......);

   　Value to be inserted to use single quotes

2. If you insert a String value

   insert into table (column names) values ​​( ' "+ String +"');

    

Project code

String sql="insert into blog (id,name,conten,data,sort) values ("+ID+",'"+NAME+"','"+CONTEN+"','"+TIME+"','"+SORT+"')";