使用ibm_db模块在Node JS中执行准备好的语句的问题

Question

I am new to NodeJS technology, while working on nodejs project, I got below issue.

I have implemented ibm_db module (to establish DB2 connection), and using "prepared statements" to execute 'SELECT' queries. Below query is executed without errors but console.log(result) is giving result as {fetchMode : 4} , but I am expecting COLUMN_1 results here. Can someone tell me if I am missing anything here.

db.prepare('SELECT COLUMN_1 FROM TABLE_A WHERE COLUMN_2=?', function(err, stmt){
        if(err){
            console.log(err);
        }
        stmt.execute(['CA'], function(err, result){
            console.log(result);
        });
});

Answer 1

Using an extra fetch inside of execute callback makes it possible for me to see the correct and wanted result of the query statement. Here an example:

db.prepare('SELECT COLUMN_1 FROM TABLE_A WHERE COLUMN_2=?', function(err, stmt){
    if(err){
        console.log(err);
    }
    stmt.execute(['CA'], function(err, result){
        result.fetch(function (err, data) {
            if (err) {
                console.error(err);
            }
            console.log(JSON.stringify(data));

            result.closeSync();
        });
    });
});

The following site gave me the hint: https://groups.google.com/d/msg/node-ibm_db/AhZeeN6jFTM/MrRXSIW3DQAJ