html dating website - Vb stored procedure not updating database

If synchronization is already performed, subsequent calls to these methods do not result in re-synchronization, unless you had modified Parameters collection or one of the properties listed above. Consider you have a stored procedure that adds a new employee to table Emp.

You can use these prefixes at any combinations to specify parameters. First, you do not have to care about the order in which parameters are created. You retrieve value returned by a stored function through a parameter with Direction property set to Return Value.

If the parameter in Command Text contains the ':' prefix, the name of the My Sql Parameter object in the command's collection should be used without any prefix. Parameters that represent arguments to the procedure must have their Direction property set to Input.

dot Connect for My SQL enhances SQL handling capabilities with usage of parameters in SQL queries. Omitted parameters will be created and assigned DBNull value. Here is how source code for this procedure may look: CREATE PROCEDURE `Add Emp`(Emp Name CHAR(20), Salary INT) BEGIN DECLARE e_No INT; DECLARE e_Name CHAR(20) DEFAULT 'Unnamed'; DECLARE e_Sal INT DEFAULT 1100; IF Emp Name IS NOT NULL THEN SET e_Name = Emp Name; END IF; IF Salary IS NOT NULL THEN SET e_Sal = Salary; END IF; SELECT Max(Emp No) INTO e_No FROM emp; INSERT INTO emp (Emp No, EName, Sal, Hire Date) VALUES (e_No 10, e_Name, e_Sal, Cur Date()); END We will invoke this procedure and pass it single parameter - Emp Name.

You can make execution of a query or stored procedure very flexible using several simple techniques. The following query My Sql Command my Sql Command1; ... Command Text = "INSERT INTO dept (deptno, dname, loc) VALUES (? You can set up required parameters in any order you like. Since Parameter Check is true, the second parameter will be created in the moment of calling Execute Non Query method.

The next example shows how to reform previous call to stored procedure using single INOUT parameter.

My Sql Connection my Conn = new My Sql Connection( "user id=root;database=demobase;host=localhost;password=root"); my Conn. Parameter Check property to true leads to some performance loss. Command Type is "Text" the synchronization is performed on client, so performance reduces very slightly. Command Type is "Stored Procedure", dot Connect for My SQL sends additional requests to server which are necessary to determine quantity, names, and other information about parameters. Parameter Check to true to reoder parameters in a proper way. Parameter Check is true you can specify only those parameters you really need. Return Value parameter receives result of the stored function my Command. If they contain a reasonable value, the procedure pastes this value as well; if a parameter contains NULL value, some defaults are used. If parameters are added to the command collection in the order that is different from the function parameters order in database, it is necessary to describe the command by setting My Sql Command. It determines next suitable Emp No, pastes current date, and checks for input parameters. If name of a parameter is suitable for the description of stored procedure, parameter is preserved in the collection, otherwise it is lost. Command Text property and Parameters collection are unchanged all subsequent invocations of Prepare or Execute methods will not result in recreation of parameters. Read Line() End Sub The following example shows how to get a stored function to work. Open() 'Set up my Command to reference stored procedure 'Add Emp' Dim my Command As My Sql Command = New My Sql Command("Add Emp", my Conn) my Command. For example, consider you had a stored procedure that accepts two arguments, deptno and dname, and then changed My Sql Command. We will not use parameters autosynchronisation here. Add("loc", "NEW YORK") My SQL server variables are also denoted using '@' symbol.

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