java通過JDBC連接Oracle並調用存儲過程和存儲方法

初始配置：電腦安裝oracle 11g（這里也可使是其它版本也可，此教程演示為11g），java環境，eclipse，oracle關於jdbc的jar包。

一，在scott用戶下首先要有存儲過程和存儲方法

　　

create or replace queryEmpIncome(eno in number)

　　　　return number
　　as

　　　　psal emp.sal%type;

　　　　pcomm emp.comm%type;

　　begin
            select sal,comm into pasl,pcomm from emp where empno = eno;
            return psal*12 + nvl(pcomm,0);
    end;

 

create or replace procedure queryEmpInformation(eno in number,
pename out varchar2,psal out number,pjob out varchar2)
as
begin
    select ename,sal,job into pename,psal,pjob from emp where empno = eno;
end;

二.創建數據庫連接工具類

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCUtils {

    private static String driver = "oracle.jdbc.OracleDriver";
    private static String url = "jdbc:oracle:thin:@localhost:1521:orcl";
    private static String user = "scott";
    private static String password = "tiger";
    static{
        //注冊驅動
        //DriverManager.registerDriver(driver)
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            throw new ExceptionInInitializerError(e);
        }
    }
    public static Connection getConnection(){
        try {
            return DriverManager.getConnection(url, user, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
    /*
     * 運行Java：
     * java -Xms100M -Xmx200M HelloWorld
     * 
     * 技術方向：
     * 1、性能優化
     * 2、故障診斷：死鎖(JDK: ThreadDump)
     *               Oracle: 自動處理
     */
    public static void release(Connection conn,Statement st,ResultSet rs){
        if(rs != null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                rs = null; ///-----> 原因：Java GC: Java的GC不受代碼的控制
            }
        }
        if(st != null){
            try {
                st.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                st = null;
            }
        }
        if(conn != null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                conn = null;
            }
        }
    }
}

三.寫測試類

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.ResultSet;

import oracle.jdbc.OracleCallableStatement;
import oracle.jdbc.OracleTypes;

import org.junit.Test;

import cn.ht.utils.JDBCUtils;

public class TestOracle {
/*
 * create or replace procedure queryEmpInformation(eno in number,
                                                pename out varchar2,
                                                psal   out number,
                                                pjob   out varchar2)
 */
    @Test
    public void testProcedure(){
        //{call <procedure-name>[(<arg1>,<arg2>, ...)]}
        String sql = "{call queryEmpInformation(?,?,?,?)}";
        Connection conn = null;
        CallableStatement call = null;
        try {
            conn = JDBCUtils.getConnection();
            call = conn.prepareCall(sql);
            //對於in參數，賦值
            call.setInt(1,7839);
            //對於out參數，申明
            call.registerOutParameter(2, OracleTypes.VARCHAR);
            call.registerOutParameter(3, OracleTypes.NUMBER);
            call.registerOutParameter(4, OracleTypes.VARCHAR);
            //執行
            call.execute();
            //輸出
            String name = call.getString(2);
            double sal = call.getDouble(3);
            String job = call.getString(4);
            System.out.println(name+"\t"+sal+"\t"+job);
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            JDBCUtils.release(conn, call, null);
        }
    }

/*
 * create or replace function queryEmpIncome(eno in number) 
return number
 */
    @Test
    public void testFunction(){
        //{?= call <procedure-name>[(<arg1>,<arg2>, ...)]}
        String sql = "{?=call queryEmpIncome(?)}";
        
        Connection conn = null;
        CallableStatement call = null;
        try {
            conn = JDBCUtils.getConnection();
            call = conn.prepareCall(sql);
            
            call.registerOutParameter(1, OracleTypes.NUMBER);
            call.setInt(2, 7839);
            
            //執行
            call.execute();
            
            //取出年收入
            double income = call.getDouble(1);
            
            System.out.println(income);
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            JDBCUtils.release(conn, call, null);
        }        
    }
}

總結：以jdbc的方式實現了java查詢數據庫。並且調用了oracle的存儲方法和過程。