Trail: JDBC(TM) Database Access(2)

package com.oracle.tutorial.jdbc;



import java.sql.CallableStatement;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.sql.Types;



public class StoredProcedureMySQLSample {



 private String dbName;

 private Connection con;

 private String dbms;



 public StoredProcedureMySQLSample(Connection connArg, String dbName,

 String dbmsArg) {

 super();

 this.con = connArg;

 this.dbName = dbName;

 this.dbms = dbmsArg;

 }

 

 public void createProcedureRaisePrice() throws SQLException {//新建存储过程

 

 String createProcedure = null;



 String queryDrop = "DROP PROCEDURE IF EXISTS RAISE_PRICE";



 createProcedure =

 "create procedure RAISE_PRICE(IN coffeeName varchar(32), IN maximumPercentage float, INOUT newPrice numeric(10,2)) " +

 "begin " +

 "main: BEGIN " +

 "declare maximumNewPrice numeric(10,2); " +

 "declare oldPrice numeric(10,2); " +

 "select COFFEES.PRICE into oldPrice " +//读取原价格

 "from COFFEES " +

 "where COFFEES.COF_NAME = coffeeName; " +

 "set maximumNewPrice = oldPrice * (1 + maximumPercentage); " +

 "if (newPrice > maximumNewPrice) " +

 "then set newPrice = maximumNewPrice; " +

 "end if; " +

 "if (newPrice <= oldPrice) " +

 "then set newPrice = oldPrice;" +

 "leave main; " +

 "end if; " +

 "update COFFEES " +

 "set COFFEES.PRICE = newPrice " +//写入新价格

 "where COFFEES.COF_NAME = coffeeName; " +

 "select newPrice; " +

 "END main; " +

 "end";

 

 Statement stmt = null;

 Statement stmtDrop = null;



 try {

 System.out.println("Calling DROP PROCEDURE");

 stmtDrop = con.createStatement();

 stmtDrop.execute(queryDrop);

 } catch (SQLException e) {

 JDBCTutorialUtilities.printSQLException(e);

 } finally {

 if (stmtDrop != null) { stmtDrop.close(); }

 }





 try {

 stmt = con.createStatement();

 stmt.executeUpdate(createProcedure);

 } catch (SQLException e) {

 JDBCTutorialUtilities.printSQLException(e);

 } finally {

 if (stmt != null) { stmt.close(); }

 }



 

 }

 

 

 public void createProcedureGetSupplierOfCoffee() throws SQLException {



 String createProcedure = null;



 String queryDrop = "DROP PROCEDURE IF EXISTS GET_SUPPLIER_OF_COFFEE";



 createProcedure =

 "create procedure GET_SUPPLIER_OF_COFFEE(IN coffeeName varchar(32), OUT supplierName varchar(40)) " +

 "begin " +

 "select SUPPLIERS.SUP_NAME into supplierName " +

 "from SUPPLIERS, COFFEES " +

 "where SUPPLIERS.SUP_ID = COFFEES.SUP_ID " +

 "and coffeeName = COFFEES.COF_NAME; " +

 "select supplierName; " +

 "end";

 Statement stmt = null;

 Statement stmtDrop = null;



 try {

 System.out.println("Calling DROP PROCEDURE");

 stmtDrop = con.createStatement();

 stmtDrop.execute(queryDrop);

 } catch (SQLException e) {

 JDBCTutorialUtilities.printSQLException(e);

 } finally {

 if (stmtDrop != null) { stmtDrop.close(); }

 }





 try {

 stmt = con.createStatement();

 stmt.executeUpdate(createProcedure);

 } catch (SQLException e) {

 JDBCTutorialUtilities.printSQLException(e);

 } finally {

 if (stmt != null) { stmt.close(); }

 }

 }

 



 public void createProcedureShowSuppliers() throws SQLException {

 String createProcedure = null;



 String queryDrop = "DROP PROCEDURE IF EXISTS SHOW_SUPPLIERS";



 createProcedure =

 "create procedure SHOW_SUPPLIERS() " +

 "begin " +

 "select SUPPLIERS.SUP_NAME, COFFEES.COF_NAME " +

 "from SUPPLIERS, COFFEES " +

 "where SUPPLIERS.SUP_ID = COFFEES.SUP_ID " +

 "order by SUP_NAME; " +

 "end";

 Statement stmt = null;

 Statement stmtDrop = null;



 try {

 System.out.println("Calling DROP PROCEDURE");

 stmtDrop = con.createStatement();

 stmtDrop.execute(queryDrop);

 } catch (SQLException e) {

 JDBCTutorialUtilities.printSQLException(e);

 } finally {

 if (stmtDrop != null) { stmtDrop.close(); }

 }





 try {

 stmt = con.createStatement();

 stmt.executeUpdate(createProcedure);

 } catch (SQLException e) {

 JDBCTutorialUtilities.printSQLException(e);

 } finally {

 if (stmt != null) { stmt.close(); }

 }

 }



public void runStoredProcedures(String coffeeNameArg, float maximumPercentageArg, float newPriceArg) throws SQLException {

    CallableStatement cs = null;



    try {

      

      System.out.println("\nCalling the procedure GET_SUPPLIER_OF_COFFEE");

      cs = this.con.prepareCall("{call GET_SUPPLIER_OF_COFFEE(?, ?)}");//存储过程语句

      cs.setString(1, coffeeNameArg);//in的跟以前一样赋值

      cs.registerOutParameter(2, Types.VARCHAR);//执行前先注册out参数

      cs.executeQuery();//执行

            

      String supplierName = cs.getString(2);//获取结果,out参数为第二个

      

      if (supplierName != null) {

        System.out.println("\nSupplier of the coffee " + coffeeNameArg + ": " + supplierName);          

      } else {

        System.out.println("\nUnable to find the coffee " + coffeeNameArg);        

      }

      

      System.out.println("\nCalling the procedure SHOW_SUPPLIERS");

      cs = this.con.prepareCall("{call SHOW_SUPPLIERS}");

      ResultSet rs = cs.executeQuery();



      while (rs.next()) {

        String supplier = rs.getString("SUP_NAME");

        String coffee = rs.getString("COF_NAME");

        System.out.println(supplier + ": " + coffee);

      }

      

      System.out.println("\nContents of COFFEES table before calling RAISE_PRICE:");

      CoffeesTable.viewTable(this.con);

      

      System.out.println("\nCalling the procedure RAISE_PRICE");

      cs = this.con.prepareCall("{call RAISE_PRICE(?,?,?)}");

      cs.setString(1, coffeeNameArg);

      cs.setFloat(2, maximumPercentageArg);

      cs.registerOutParameter(3, Types.NUMERIC);//inout类型的也要注册

      cs.setFloat(3, newPriceArg);

      

      cs.execute();//如果不确定会返回几个ResultSet就用这个

      

      System.out.println("\nValue of newPrice after calling RAISE_PRICE: " + cs.getFloat(3));

      

      System.out.println("\nContents of COFFEES table after calling RAISE_PRICE:");

      CoffeesTable.viewTable(this.con);

      





    } catch (SQLException e) {

      JDBCTutorialUtilities.printSQLException(e);

    } finally {

      if (cs != null) { cs.close(); }

    }

  }

 

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