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- #Multiple selects in stored procedure mysql jdbc how to
- #Multiple selects in stored procedure mysql jdbc manual
Note that the Statement object is not closed in this method. This is a convention in Java DB to indicate that the stored procedure will use the currently existing Connection object. Retrieve the Connection object from the URL jdbc:default:connection. In addition, ensure that this Java method is public and static.
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If your stored procedure returns any number of ResultSet objects, specify one parameter of type ResultSet in your Java method. Note that the method showSuppliers contains a parameter of type ResultSet. You can specify arguments in a stored procedure by defining them in the method signature of your public static Java method. The SHOW_SUPPLIERS stored procedure takes no arguments. Public static void showSuppliers(ResultSet rs)Ĭonnection con = DriverManager.getConnection("jdbc:default:connection") StoredProcedureJavaDBSample.showSuppliers, contains the SQL statements that the stored procedure SHOW_SUPPLIERS calls: Package the Java class (that contains the public static Java method you created earlier) in a JAR file.Create the stored procedure: This stored procedure calls the Java method you created.Create a public static Java method in a Java class: This method performs the required task of the stored procedure.
#Multiple selects in stored procedure mysql jdbc manual
Note: See the section "CREATE PROCEDURE statement" in Java DB Reference Manual for more information about creating stored procedures in Java DB.Ĭreating and using a stored procedure in Java DB involves the following steps: What kinds of actual parameters (arguments) can be passed to the stored procedure?Īctual parameter can be a constant, initialized variable, literal, or expression. No if omitted, then the parameter mode of the formal parameter is IN.ĭoes the parameter pass a value to the stored procedure or return a value?īoth passes initial values to a stored procedure returns updated values to the caller.ĭoes the formal parameter act as a constant or a variable in the stored procedure?įormal parameter acts like an uninitialized variable.įormal parameter acts like an initialized variable.Ĭan the formal parameter be assigned a value in the stored procedure?įormal parameter cannot be assigned a value.įormal parameter cannot be used in an expression must be assigned a value.įormal parameter must be assigned a value. Must it be specified in the stored procedure definition? The following table summarizes the information about parameter modes. They define the action of formal parameters. The parameter attributes IN (the default), OUT, and INOUT are parameter modes. Value of newPrice after calling RAISE_PRICE: 8.79Ĭontents of COFFEES table after calling RAISE_PRICE:
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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:
#Multiple selects in stored procedure mysql jdbc how to
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. 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.