Mysql procedure select into multiple variables

This is a case where T-SQL syntax is clearer. Having these as separate lists causes the same maintenance problem as DECLARE CURSOR and FETCH (not that I, uh, ever use those). MySql set multiple variables. Note: All data, names or naming found within the database presented in this post, are strictly used for practice, learning, instruction, and testing purposes.

When I call the procedure I only receive the last row of data that was looped into the variable for each cursor. MySQL allows you to declare two or more variables that share the same name in different scopes. Because a variable is only effective in its scope.

However, declaring variables with the same name in different scopes is not good programming practice. Variables can be set directly with the SET statement. INTO var _list or by opening a cursor and using FETCH.

The INTO clause can name a list of one or more variables , which can be user-defined variables , stored procedure or function parameters, or stored program local variables. But only to the client. You cannot return a et or a cursor to another stored procedure or query. A possible workaround is to create a prepared statement which is considered as a return value.

Prepared statements, like user variables , exist at a session level,. The select will need to return one row and the variables being selected “in to” need to be already declared. Example : User variables. Local variables inside Stored Procedures. MySQL certainly is the most open source RDBMS which is widely used by both community and enterprise but during the first decade of its existence, it did not support stored procedure , trigger, event…Since MySQL version 5. MySQL database engine to allow MySQL more flexible and powerful.

SELECT - full SELECT syntax. Select into variables. CREATE TABLE Employee. Save select result into a. The MySQL server maintains system variables that configure its operation. A system variable can have a global value that affects server operation as a whole, a session value that affects the current session, or both.

Assigning variable values from query is a common technique. However, when expression is the name of a column, it can return multiple values. SQL Server provides us with two methods in T-SQL to assign a value to a previously created local SQL variable. The first method is the SET statement, the ANSI standard statement that is commonly used for variable value assignment. INTO is a method for setting variables.

One property is that you can read from and assign to a user variable simultaneously, because an assignment can be an r-value (the result of the assignment is the final value of the variable). The result of queries that returns one value can be stored into a variable. Secon select the customer whose id is 1into the r_customer record. Thir show the customer’s name and website. The following example fetches the names of customer and contact from the customers and contacts tables for a specific customer id.

Note that EXEC allows the use of both regular character strings and Unicode character strings as input). Understanding the sp_executesql Stored Procedure.