When the example calls this stored procedure, the example produces output similar to the following:Ĭontents of COFFEES table before calling RAISE_PRICE:
This stored procedure does not require any parameters. SHOW_SUPPLIERS: Prints a result set that contains the names of coffee suppliers and the coffees they supply to The Coffee Break. StoredProcedureMySQLSample.java create and call the following stored procedures: Creating Stored Procedure in MySQL with SQL Scripts or JDBC API.Creating Stored Procedures in Java DB with SQL Scripts or JDBC API.
StoredProcedureMySQLSample.java, that demonstrate how to create stored procedures in Java DB and MySQL, respectively. Consequently, the tutorial contains two samples, Note that stored procedures are supported by most DBMSs, but there is a fair amount of variation in their syntax and capabilities. Stored procedures can be compiled and executed with different parameters and results, and they can have any combination of input, output, and input/output parameters. For example, operations on an employee database (hire, fire, promote, lookup) could be coded as stored procedures executed by application code. Please see the node I have referenced above for examples.A stored procedure is a group of SQL statements that form a logical unit and perform a particular task, and they are used to encapsulate a set of operations or queries to execute on a database server. So, this means that $sth->more_results() doesn't just mean "are there more results?" but is also the command to retrieve the next result set. If one creates a stored procedure that always returns a known number of result sets (probably good practice to do this anyway), the only difference to the "traditional" usage of DBI is that you need to call $sth->more_results() before retrieving each new set (otherwise you don't get the new set.)
I asked for clarification on this issue, but ended up getting the answers through experimentation. Re: Multiple data sets in MySQL stored procedures In your case, I bet if you ask them for details so that it can fixed, you will get an amazing amount of information and stories that will keep you running-around on why it is an issue. Often they will say or do 'ANYTHING' to keep from changing their habits or their thoughts on particular subjects/processes or methods. Once they find some way of doing something they will not attempt to find another way to do it. Re^2: Multiple data sets in MySQL stored proceduresĬonsistently I have found( in general not just IT) that most people are intellectually lazy.
This makes client-side programming elegant, as I can throw a Transact-SQL block with IF and WHILE clauses at the server and not have to add any special code to handle it. Then there is the Sybase way, where not only stored procs, but normal SQL batches including lots of requests can be sent to the dataserver with one single request, followed by a simple loop to fetch the results. There are situations where a stored proc that returns multiple result sets makes a lot of sense.
My $defaults_file = "$ENV Multiple data sets in MySQL stored procedures If this call returns anything different from undef, it means that another data set awaits treatment, and you can handle each one of them as if they were isolated. The method, shown in the code below, requires a call to $sth->more_results after the you have dealt with the first data set. Starting with version 4.001, the issue has been properly addressed, and now you can get your results from a stored procedure with just a bit of extra care. Versions between 3.0005 and 3.0008 could get one dataset, but failed to get the next ones, and no error was generated. Even when the stored procedure includes only one statement, it generated an error. Old version of DBD::mysql could simply not deal with this problem. Thus a simple call to a stored procedure may end up with multiple data sets, which need to be handled properly. Each call to SELECT generates a data set. The latest versions of DBD::mysql introduced some enhancements, and especially it has fixed a bug that prevented Perl users from calling stored procedures containing multiple datasets.Īs stated in the manual, MySQL stored procedures can include one or more SELECT statements in their body.