- Syntax: while (condition) { // code to be executed } If the condition starts out as false, the statements won’t execute at all. The while statement includes the condition in parentheses, and it is followed by a block of statements within braces. In MySQL, the IF-THEN-ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE. Suppose you want to calculate gross salaries of 20 different persons or take a list of maximum and minimum temperatures of a certain month or a year, the while loop is ideal to solve these types of cases. adamschroeder. The LEAVE causes the current loop specified by the label to be terminated. New Topic. MySQL Forums Forum List » Connector/Python. The PHP do...while Loop The do...while loop will always execute the block of code once, it will then check the condition, and repeat the loop while the specified condition is true. While loop Syntax WHILE (expression) DO statements END WHILE When to use while loops. The do...while loop - Loops through a block of code once, and then repeats the loop as long as the specified condition is true. This MySQL tutorial explains how to use the ITERATE statement in MySQL with syntax and examples. Append each loop iteration's text to an array, which you can then echo later using implode(). MySQL: Loops and Conditional Statements The following is a list of topics that explain how to use Loops and Conditional Statements in MySQL: - Example: Once the condition gets FALSE, it exits from the body of loop. The while loop executes a block of code repeatedly until the condition is FALSE. In MySQL, the ITERATE statement is used when you are want a loop body to execute again. mysql> delimiter // mysql> CREATE PROCEDURE Sp_AllRowsOfATable() -> BEGIN -> DECLARE lastRows INT DEFAULT 0; -> DECLARE startRows INT DEFAULT 0; -> SELECT COUNT(*) FROM AllRows INTO lastRows; -> SET startRows=0; -> WHILE startRows INSERT INTO SecondTableRows(StudentId) SELECT (Id) FROM AllRows LIMIT startRows ,1; -> SET startRows= … while loop: The while loop is also an entry control loop like for loops i.e., it first checks the condition at the start of the loop and if its true then it enters the loop and executes the block of statements, and goes on executing it as long as the condition holds true. While Loop PHP While loop. While loops are used to execute a block of code until a certain condition becomes true. For the rules regarding label use, see Section 13.6.2, “Statemen This MySQL tutorial explains how to use the LEAVE statement in MySQL with syntax and examples. Using a PHP While Loop we can use this information to our advantage. I use MySQL Workbench to make this.. A quick stored procedure should do the job: DROP PROCEDURE IF EXISTS proc_loop_test; CREATE PROCEDURE proc_loop_test() BEGIN DECLARE int_val INT DEFAULT 0; test_loop : LOOP IF (int_val = 10) THEN LEAVE test_loop; END IF; SET int_val = int_val +1; SELECT int_val; END LOOP; END; It works like the break statement in other programming languages like PHP, C/C++, and Java.. This MySQL tutorial explains how to use the IF-THEN-ELSE statement in MySQL with syntax and examples. The LEAVE statement immediately exits the loop. DELIMITER // CREATE PROCEDURE while_loop(IN number INT, INOUT result TEXT) BEGIN DECLARE x INT; SET x = 1; WHILE x <= result DO SET result = CONCAT(result, … end while; An example of using a while loop in a stored procedure is as follows. It is used within the LOOP statement, WHILE statement, and REPEAT statement. But the problem is that I'm running a mysql_query within a while loop, which I was told I should avoid. Topics Feed. The biggest problem with the PHP snippet above comes down to the fact that there’s a MySQL query inside a while loop. Start New Topic. PHP & MySql WHILE loop 3 ; Not what you need? Dump all the raw results into a multi-dim array using fetch_all(), then loop on that array when ready to echo output. The basic syntax of DO .. Syntax: while (if the condition is true) { // code is executed } PHP. In addition to the LEAVE statement, you can use the ITERATE statement to skip the current loop iteration and start a new iteration. Posted by: João Abrantes Date: September 16, 2008 08:50AM hello everyone. WHILE and WHILE is that DO .. statement_list consists of one or more SQL statements, each terminated by a semicolon (;) statement delimiter.. A WHILE statement can be labeled. You can put the array pointer back with the reset($myArray) function. We equally welcome both specific questions as well as open-ended discussions. The ITERATE is similar to the continue statement in PHP, C/C++, and Java.. MySQL LOOP statement example What this means is every single time that loop is … SQL WHILE loop provides us with the advantage to execute the SQL statement(s) repeatedly until the specified condition result turn out to be false. If a loop is enclosed within another loop, you can break out of both loops with a single LEAVE statement.. WHILE is as follows: DO { [code to execute] } WHILE (conditional statement) The difference between DO .. conn = MySQLdb.Connect(host='localhost', user='root', db='database', passwd='password') This means the second while loop on that array will be skipped! Hi guys, I have two tables. WHILE is used in PHP to provide a control condition. The While loop is a loop statement that performs a block of code repeatedly as long as a condition is true. In MySQL, the LEAVE statement is used when you want to exit a block of code identified by a label_name, such as a LOOP statement, WHILE statement, or REPEAT statement. While loop. You can't do a for loop in an SQL editor without a stored procedure. Using LEAVE statement in a loop example. Reach out to all the awesome people in our web development community by starting your own topic. This means that first the … September 5, 2014, 2:01am #1. You can use a while loop to read records returned from a database query. At the end of the while (list / each) loop the array pointer will be at the end. [begin_label:] WHILE search_condition DO statement_list END WHILE [end_label] The statement list within a WHILE statement is repeated as long as the search_condition expression is true. They are used to execute a block of code a repeatedly until the set condition gets satisfied . Do the echo within the while() loop itself. DO .. As we have said, the mysql_fetch_array function returns an associative array, but it also returns FALSE if there are no more rows to return! The while statement is simple, it executes the … i have a program that is in a while loop using the select command to read a table from sql. In the following sections of this article, we will use more flowcharts in order to explain the notions and examples. add_comment Reply to this Topic The following stored procedure generates a string of integer with the number from 1 to a random number between 4 and 10: While loop A while loop runs code repeatedly as long as a condition remains TRUE. The while loop is also called an Entry control loop because the condition is checked before entering the loop body. Types of while loops . Fetch Array While Loop. Advanced Search. PHP Tutorial > PHP Commands > DO WHILE Loop. It should be used if the number of iterations is not known. The idea is to execute a piece of code while a condition is true. 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