Mysql + json formatting - mysql

Question

In my node app i am using mysql. I retrieve data from mysql and converting each row to json(working fine).But my requirement i have to print the field with value otherwise don't.
Consider:
My sql result..
level0:"xxxxxx" level1:"fffffff" level3:"btggtgt" level:""
Now the json i am getting is:
[
{
level0="xxxxxxx",
level1="fffffff",
level3="btggtgt".
level4=""
}
]
But i need the output as:
[
{
level0="xxxxxxx",
level1="fffffff",
level3="btggtgt"
}
]
i have to omit level4 because its value is ""(empty).
My code is:
connection.query("select * from levels where level0 = '" + level0 + "' and level1 = '"+level1+"' and level2 = ''", function(err, row1, fields) {
res.writeHead(200, { 'Content-Type': 'application/json'});
res.end(JSON.stringify(row1,null,"\n"));
});
var query5result;
querylevel5(function(result5)
{
for (var level in result5)
{
console.log("ssssssss="+util.inspect(result5[level]))
if (result5[level] == null || result5[level] == '')
{
delete result5[level];
}
}
query5result=result5;

Answer 1

Here is a way to loop and delete this empty level
connection.query("select * from levels where level0 = '" + level0 + "' and level1 = '"+level1+"' and level2 = ''", function(err, row1, fields) {
for (var level in row1)
{
if (row1[level] == null || row1[level] == "")
{
delete row1[level];
}
}
)};
//...then go on:
res.end(JSON.stringify(row1,null,"\n"));