Mysql stored procedure cursor with parameter

In my procedure , I have in parameters and one or both of them could be null. I need to create a cursor to loop over, but my cursor needs to be based on the in parameters. Dynamic cursor in stored procedure.

MySQL Procedure with Cursor Parameter - Stack. Hi, I am having trouble to declare a cursor for a query passed as parameter to a stored procedure. Below is the code, MySQL version is 5. A cursor can’t be used by itself in MySQL. It is an essential component in stored procedures. With cursors , we can traverse a dataset and manipulate each record to accomplish certain tasks.

Almost stored procedures that you develop require parameters. The parameters make the stored procedure more flexible and useful. In MySQL , a parameter has one of three modes: IN, OUT , or INOUT.

DECLARE curCURSOR FOR SELECT i FROM test. To handle a result set inside a stored procedure , you use a cursor. MySQL cursor is read-only, non-scrollable and asensitive. Read-only: you cannot update data in the underlying table through the cursor. You cannot access these tables directly.

Instea query the INFORMATION_SCHEMA ROUTINES and PARAMETERS tables. Stored procedures are stored in the mysql. All most all relational database system supports stored procedure , MySQL introduce stored procedure. A procedure has a name, a parameter list, and SQL statement(s).

That allows us to perform operations on every record on a one-by-one basis. Just like loops, cursors are only supported within stored procedures and functions. Here’s a stored procedure to give you a taste of cursors and how they are utilized.

This method calls the stored procedure named by the proc_name argument. The args sequence of parameters must contain one entry for each argument that the procedure expects. Input parameters are left untouched. What is the use of a stored procedure in MySQL?

Where stored procedures are stored in MySQL? Are stored procedures supported in MySQL? CREATE PROCEDURE and CREATE FUNCTION Statements. Condition Handling and OUT or INOUT Parameters. Can I return a cursor as an OUT parameter from a stored procedure ? MySQL supports cursors inside stored programs.

An IN parameter passes a value into a procedure. The procedure might modify the value, but the modification is not visible to the caller when the procedure returns. An OUT parameter passes a value from the procedure back to the caller. Its initial value is NULL within the procedure , and its value is visible to the caller when the procedure returns.

This process actually retrieves the data using the previously defined SELECT statement. With the cursor populated with data, individual rows can be fetched (retrieved) as needed. When it is done, the cursor must be closed.

After a cursor is declare it may be opened and closed as often as needed. The following example shows a simple stored procedure that uses an INOUT parameter and an IN parameter. The INOUT parameter (mfgender) will return the result to a user. Cursor is used to iterate through a set of rows, which returned by a query, and process individual row.

Currently with all versions greater 5. Parameters – introduce you to various types of parameters used in stored procedures including IN, OUT, and INOUT parameter.