How to get column value from Table in sqlite +phongap

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SQL

SQLite

PhoneGap

need to get column value from table .i have one table have Name A.Have column id,a,b I need to get value of a(using ID).How to get ? I used like

function getName(tx){
alert(ROW_ID);

tx.executeSql("SELECT a " + "FROM A "
+ "WHERE id =" + ROW_ID, [], query_Success, _errorCB);


}
function query_Success(rst){

alert(rst);
}