How do you iterate through a result set?
To iterate the ResultSet you use its next() method. The next() method returns true if the ResultSet has a next record, and moves the ResultSet to point to the next record. If there were no more records, next() returns false, and you can no longer.
How do you loop a SQL query?
I am detailing answer on ways to achieve different types of loops in SQL server.
- FOR Loop. DECLARE @cnt INT = 0; WHILE @cnt < 10 BEGIN PRINT ‘Inside FOR LOOP’; SET @cnt = @cnt + 1; END; PRINT ‘Done FOR LOOP’;
- DO.. WHILE Loop. …
- REPEAT..UNTIL Loop.
How do I iterate through a cursor in SQL?
The cursor FOR LOOP implicitly creates its loop index as a record variable with the row type in which the cursor returns and then opens the cursor. In each loop iteration, the cursor FOR LOOP statement fetches a row from the result set into its loop index.
How do I create a foreach loop in SQL Server?
1. create a temp table and put the records you want to iterate in there 2. use WHILE @@ROWCOUNT <> 0 to do the iterating 3. to get one row at a time do, SELECT TOP 1 <fieldnames> b. save the unique ID for that row in a variable 4.
How can I get ResultSet size?
Simply iterate on ResultSet object and increment rowCount to obtain size of ResultSet object in java. rowCount = rs. getRow();
How do I get a complete row from a ResultSet?
The getRow() method of the ResultSet interface retrieves the current row number/position of the ResultSet pointer. This method returns an integer value representing the current row number to which the ResultSet pointer points to.
Is there a for loop in SQL?
In SQL Server, there is no FOR LOOP. However, you simulate the FOR LOOP using the WHILE LOOP.
Can you write a loop in SQL?
In programming, a loop allows you to write a set of code that will run repeatedly within the same program. Many programming languages have several different types of loop to choose from, but in SQL Server there is only one: the WHILE loop.
How do I stop an infinite loop in SQL Server?
In SQL Server, the BREAK statement is used when you want to exit from a WHILE LOOP and execute the next statements after the loop’s END statement.
Why cursors are used in SQL?
In SQL procedures, a cursor make it possible to define a result set (a set of data rows) and perform complex logic on a row by row basis. By using the same mechanics, an SQL procedure can also define a result set and return it directly to the caller of the SQL procedure or to a client application.
What is difference between stored procedure and function?
The function must return a value but in Stored Procedure it is optional. Even a procedure can return zero or n values. Functions can have only input parameters for it whereas Procedures can have input or output parameters. Functions can be called from Procedure whereas Procedures cannot be called from a Function.
Which is better cursor or while loop in SQL Server?
While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets.
Which form of continue will exit any loop SQL?
Oracle Database 11g offers a new feature for loops: the CONTINUE statement. Use this statement to exit the current iteration of a loop, and immediately continue on to the next iteration of that loop. This statement comes in two forms, just like EXIT: the unconditional CONTINUE and the conditional CONTINUE WHEN.
How do I stop a while loop in SQL Server?
Avoid the use of the WHILE LOOP. Use UNION ALL instead of UNION whenever is possible. Avoid using the joins of multiple tables in the where and join in the from clause.