java 调用存储过程

时间:2021-07-02 15:47:45

//调用存储过程带参
            CallableStatement ca = conn.prepareCall("{call Login (?,?)}");
            ca.setString(1,username);
            ca.setString(2,password);
            ca.execute();

//调用存储过程带返回参数的
            CallableStatement ca = conn.prepareCall("{call Login (?,?,?)}");
            ca.setString(1,username);
            ca.setString(2,password); 
            ca.registerOutParameter(3,java.sql.Types.INTEGER);
            ca.execute();
            int returnOut = ca.getInt(3);

 //调用存储过程带返回值的return
            CallableStatement ca = conn.prepareCall("{?=call Login (?,?,?)}");
            ca.setString(2,username);
            ca.setString(3,password); 
            ca.registerOutParameter(1,java.sql.Types.INTEGER);
            ca.execute();
            int returnOut = ca.getInt(1);

    //调用存储过程返回两个结果集
            CallableStatement ca = conn.prepareCall("{call Login (?,?,?)}");
            ca.setString(1,username);
            ca.setString(2,password); 
            ca.execute();


这段时间开始学习写存储过程,主要原因还是因为工作需要吧,本来以为很简单的,但几经挫折,豪气消磨殆尽,但总算搞通了,为了避免后来者少走弯路,特记述与此,同时亦对自己进行鼓励。

一:无返回值的存储过程

存储过程为:

CREATE OR REPLACE PROCEDURE TESTA(PARA1 IN VARCHAR2,PARA2 IN VARCHAR2)  AS

BEGIN

   INSERT INTO HYQ.B_ID (I_ID,I_NAME) VALUES (PARA1, PARA2);

END TESTA;

然后呢,在java里调用时就用下面的代码:

package com.hyq.src;

 

import java.sql.*;

import java.sql.ResultSet;

 

public class TestProcedureOne {

  public TestProcedureOne() {

  }

  public static void main(String[] args ){

    String driver = "oracle.jdbc.driver.OracleDriver";

    String strUrl = "jdbc:oracle:thin:@127.0.0.1:1521: hyq ";

    Statement stmt = null;

    ResultSet rs = null;

    Connection conn = null;

    CallableStatement cstmt = null;

 

    try {

      Class.forName(driver);

      conn =  DriverManager.getConnection(strUrl, " hyq ", " hyq ");

      CallableStatement proc = null;

      proc = conn.prepareCall("{ call HYQ.TESTA(?,?) }");

      proc.setString(1, "100");

      proc.setString(2, "TestOne");

      proc.execute();

    }

    catch (SQLException ex2) {

      ex2.printStackTrace();

    }

    catch (Exception ex2) {

      ex2.printStackTrace();

    }

    finally{

      try {

        if(rs != null){

          rs.close();

          if(stmt!=null){

            stmt.close();

          }

          if(conn!=null){

            conn.close();

          }

        }

      }

      catch (SQLException ex1) {

      }

    }

  }

}

当然了,这就先要求要建张表TESTTB,里面两个字段(I_ID,I_NAME)。

二:有返回值的存储过程(非列表)

存储过程为:

CREATE OR REPLACE PROCEDURE TESTB(PARA1 IN VARCHAR2,PARA2 OUT VARCHAR2)  AS

BEGIN

   SELECT INTO PARA2 FROM TESTTB WHERE I_ID= PARA1;

END TESTB;

在java里调用时就用下面的代码:

package com.hyq.src;

 

public class TestProcedureTWO {

  public TestProcedureTWO() {

  }

  public static void main(String[] args ){

    String driver = "oracle.jdbc.driver.OracleDriver";

    String strUrl = "jdbc:oracle:thin:@127.0.0.1:1521:hyq";

    Statement stmt = null;

    ResultSet rs = null;

    Connection conn = null;

    try {

      Class.forName(driver);

      conn =  DriverManager.getConnection(strUrl, " hyq ", " hyq ");

      CallableStatement proc = null;

      proc = conn.prepareCall("{ call HYQ.TESTB(?,?) }");

      proc.setString(1, "100");

      proc.registerOutParameter(2, Types.VARCHAR);

      proc.execute();

      String testPrint = proc.getString(2);

      System.out.println("=testPrint=is="+testPrint);

    }

    catch (SQLException ex2) {

      ex2.printStackTrace();

    }

    catch (Exception ex2) {

      ex2.printStackTrace();

    }

    finally{

      try {

        if(rs != null){

          rs.close();

          if(stmt!=null){

            stmt.close();

          }

          if(conn!=null){

            conn.close();

          }

        }

      }

      catch (SQLException ex1) {

      }

    }

  }

}

 

}

注意,这里的proc.getString(2)中的数值2并非任意的,而是和存储过程中的out列对应的,如果out是在第一个位置,那就是proc.getString(1),如果是第三个位置,就是proc.getString(3),当然也可以同时有多个返回值,那就是再多加几个out参数了。

三:返回列表

由于oracle存储过程没有返回值,它的所有返回值都是通过out参数来替代的,列表同样也不例外,但由于是集合,所以不能用一般的参数,必须要用pagkage了.所以要分两部分,

1,  建一个程序包。如下:

CREATE OR REPLACE PACKAGE TESTPACKAGE  AS

 TYPE Test_CURSOR IS REF CURSOR;

end TESTPACKAGE;

2,建立存储过程,存储过程为:

CREATE OR REPLACE PROCEDURE TESTC(p_CURSOR out TESTPACKAGE.Test_CURSOR) IS

BEGIN

    OPEN p_CURSOR FOR SELECT * FROM HYQ.TESTTB;

END TESTC;

可以看到,它是把游标(可以理解为一个指针),作为一个out 参数来返回值的。

在java里调用时就用下面的代码:

package com.hyq.src;

import java.sql.*;

import java.io.OutputStream;

import java.io.Writer;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import oracle.jdbc.driver.*;

 

 

public class TestProcedureTHREE {

  public TestProcedureTHREE() {

  }

  public static void main(String[] args ){

    String driver = "oracle.jdbc.driver.OracleDriver";

    String strUrl = "jdbc:oracle:thin:@127.0.0.1:1521:hyq";

    Statement stmt = null;

    ResultSet rs = null;

    Connection conn = null;

 

    try {

      Class.forName(driver);

      conn =  DriverManager.getConnection(strUrl, "hyq", "hyq");

 

      CallableStatement proc = null;

      proc = conn.prepareCall("{ call hyq.testc(?) }");

      proc.registerOutParameter(1,oracle.jdbc.OracleTypes.CURSOR);

      proc.execute();

      rs = (ResultSet)proc.getObject(1);

 

      while(rs.next())

      {

          System.out.println("<tr><td>" + rs.getString(1) + "</td><td>"+rs.getString(2)+"</td></tr>");

      }

    }

    catch (SQLException ex2) {

      ex2.printStackTrace();

    }

    catch (Exception ex2) {

      ex2.printStackTrace();

    }

    finally{

      try {

        if(rs != null){

          rs.close();

          if(stmt!=null){

            stmt.close();

          }

          if(conn!=null){

            conn.close();

          }

        }

      }

      catch (SQLException ex1) {

      }

    }

  }

}


            ResultSet rs = ca.getResultSet();
            while(rs.next())
            {
                System.out.println(rs.getInt(1)+rs.getString(2));
            }
         if(ca.getMoreResults())
            {
                rs = ca.getResultSet();
                while (rs.next()) {
                    System.out.println(rs.getInt(1) + rs.getString(2));
                }