FMDB SQLite question: row count of a query?

Question

does anyone know how to return the count of a query when using FMDB? If I executeQuery @\"select count(*) from sometable were...\" I get an empty FMResultSet back. How can I get

Answer 1

Swift 2 Example

This code snippet will print the count for you.

if let rs = db.executeQuery("SELECT COUNT(*) as Count FROM TABLE_NAME", withArgumentsInArray: nil) {
    while rs.next() {
        print("Total Records:", rs.intForColumn("Count"))
    }
}

If it did not work, a few suggestions:

a) Look for a line in your project that says let database = or var database =. If you find one then change db to database
b) Did you change the TABLE_NAME in the Select statement to whatever your table is called?

Answer 2

updated for Swift 3 minor change to "int For Column"

if let rs = db.executeQuery("SELECT COUNT(*) as Count FROM TABLE_NAME", withArgumentsInArray: nil) {
while rs.next() {
    print("Total Records:", rs.int(forColumn: "Count"))
    }
}

Answer 3

The first one is also right but by using this method you can retrieve records and count using the same query , no headache to write another one. Just add count(*) as count to your query.

You could always just run the proper SQL statement. I do something like:

FMResultSet *rs = [database executeQuery:@"select count(*) as count from words"];
[rs next];

wordsThatExist = [rs intForColumn:@"count"];

Setting up the SQL query may be quicker and cheaper then iterating.. I believe counts are cheap.

Answer 4

updated for Swift 4 minor change in method parameter name

if let rs = db.executeQuery("SELECT COUNT(*) as Count FROM TABLE_NAME", withArgumentsIn: nil) {
while rs.next() {
    print("Total Records:", rs.int(forColumn: "Count"))
    }
}

Answer 5

Shorter code to accomplish the same thing:

NSUInteger count = [db intForQuery:@"SELECT COUNT(field) FROM table_name"];

Make sure to include the FMDatabaseAdditions.h header file to use intForQuery:.

Answer 6

Please Try Following Code, this works for me

let objManager = ModelManager.getInstance()

objManager.database?.open()

let resultSet1: FMResultSet! = sharedInstance.database!.executeQuery("SELECT COUNT(Field) FROM TableName”, withArgumentsInArray:nil)

        if (resultSet1 != nil)
        {
            while resultSet1.next()
            {
              countRecord = Int(resultSet1.intForColumn("COUNT(Field)"))
            }

        }

     print(countRecord)

You Will get Count of Field