Mysql c updating result sets
You can retrieve values using either the index number of the column or the alias or name of the column. For example, the following method, Strings used as input to getter methods are case-insensitive.When a getter method is called with a string and more than one column has the same alias or name as the string, the value of the first matching column is returned.TIMESTAMP and DATETIME columns can be automatically initializated and updated to the current date and time (that is, the current timestamp).For any TIMESTAMP or DATETIME column in a table, you can assign the current timestamp as the default value, ...-- DROP PROCEDURE IF EXISTS check User; DELIMITER // CREATE PROCEDURE check User(IN in_email VARCHAR(80), IN in_password VARCHAR(50)) BEGIN SELECT id, name FROM users WHERE email = in_email AND password = in_password LIMIT 1; -- If result is 1, UPDATE users SET online = 1 WHERE id = "result_id"; END // DELIMITER ; DELIMITER // CREATE PROCEDURE check User(IN in_email VARCHAR(80), IN in_password VARCHAR(50)) BEGIN DECLARE temp Id INT DEFAULT 0; DECLARE temp Name VARCHAR(50) DEFAULT NULL; DECLARE done INT DEFAULT 0; DECLARE cur CURSOR FOR SELECT id, name FROM users WHERE email = in_email AND password = in_password; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; OPEN cur; REPEAT FETCH cur INTO temp Id, temp Name; UPDATE users SET online = 1 WHERE id = temp Id; UNTIL done = 1 END REPEAT; CLOSE cur; SELECT temp Name; END // DELIMITER ; You could try an if statement if you have an result which returns 1 i looked at yor code, it seems nothing returns a true so you have to refactor it, as above omg wrote thats realy true why do you have an limit 1 in your select query where only one emailadress can exisst?
Finally, it returns value greater than zero if an error occurred. Some people prefer to put their images into the database, some prefer to keep them on the file system for their applications. My SQL comes in two versions: My SQL server system and My SQL embedded system. We provide connection handler, host name, user name and password parameters to the function.SELECT * FROM Cars; ------ ------------ -------- | Id | Name | Price | ------ ------------ -------- | 1 | Audi | 52642 | | 2 | Mercedes | 57127 | | 3 | Skoda | 9000 | | 4 | Volvo | 29000 | | 5 | Bentley | 350000 | | 6 | Citroen | 21000 | | 7 | Hummer | 41400 | | 8 | Volkswagen | 21600 | ------ ------------ -------- 8 rows in set (0.00 sec) function.Single-table syntax: UPDATE [LOW_PRIORITY] [IGNORE] table_reference SET assignment_list [WHERE where_condition] [ORDER BY ...] [LIMIT row_count] value: assignment: col_name = ...The SET clause indicates which columns to modify and the values they should be ...
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An update statement is optimized like a SELECT query with the additional overhead of a write.