0
点赞
收藏
分享

微信扫一扫

oracle存储过程


1.基本结构

CREATE OR REPLACE PROCEDURE 存储过程名字
(
    参数1 IN NUMBER,
    参数2 IN NUMBER
) IS
变量1 INTEGER :=0;
变量2 DATE;
BEGINEND 存储过程名字

2.SELECT INTO STATEMENT

将select查询的结果存入到变量中,可以同时将多个列存储多个变量中,必须有一条
  记录,否则抛出异常(如果没有记录抛出NO_DATA_FOUND)
  例子: 
  BEGIN
  SELECT col1,col2 into 变量1,变量2 FROM typestruct where xxx;
  EXCEPTION
  WHEN NO_DATA_FOUND THEN
      xxxx;
  END;
  ...

3.IF 判断

IF V_TEST=1 THEN
    BEGIN 
       do something
    END;
  END IF;

4.while 循环
 

WHILE V_TEST=1 LOOP
  BEGIN
 XXXX
  END;
  END LOOP;

5.变量赋值
 

V_TEST := 123;

6.用for in 使用cursor
 

...
  IS
  CURSOR cur IS SELECT * FROM xxx;
  BEGIN
 FOR cur_result in cur LOOP
  BEGIN
   V_SUM :=cur_result.列名1+cur_result.列名2
  END;
 END LOOP;
  END;

7.带参数的cursor
 

CURSOR C_USER(C_ID NUMBER) IS SELECT NAME FROM USER WHERE TYPEID=C_ID;
  OPEN C_USER(变量值);
  LOOP
 FETCH C_USER INTO V_NAME;
 EXIT FETCH C_USER%NOTFOUND;
    do something
  END LOOP;
  CLOSE C_USER;

8.用pl/sql developer debug
  连接数据库后建立一个Test WINDOW
  在窗口输入调用SP的代码,F9开始debug,CTRL+N单步调试

资料引用:http://www.knowsky.com/344816.html

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) {
      }
    }
  }
}

在这里要注意,在执行前一定要先把oracle的驱动包放到class路径里,否则会报错的。

 SQL server 的存储过程返回结果集很简单

Oracle 存储过程返回结果集怎么这么费劲?
过程返回记录集:

CREATE OR REPLACE PACKAGE pkg_test 
AS 
    TYPE myrctype IS REF CURSOR; 
  
    PROCEDURE get (p_id NUMBER, p_rc OUT myrctype); 
END pkg_test; 
/ 
  
CREATE OR REPLACE PACKAGE BODY pkg_test 
AS 
    PROCEDURE get (p_id NUMBER, p_rc OUT myrctype) 
    IS 
       sqlstr   VARCHAR2 (500); 
    BEGIN 
       IF p_id = 0 THEN 
          OPEN p_rc FOR 
             SELECT ID, NAME, sex, address, postcode, birthday 
               FROM student; 
       ELSE 
          sqlstr := 
             'select id,name,sex,address,postcode,birthday 
            from student where id=:w_id'; 
          OPEN p_rc FOR sqlstr USING p_id; 
       END IF; 
    END get; 
END pkg_test; 
/


  
函数返回记录集:
建立带ref cursor定义的包和包体及函数:

CREATE OR REPLACE 
package pkg_test as 
/* 定义ref cursor类型 
    不加return类型,为弱类型,允许动态sql查询, 
    否则为强类型,无法使用动态sql查询; 
*/ 
   type myrctype is ref cursor;  
   
--函数申明 
   function get(intID number) return myrctype; 
end pkg_test; 
/ 
   
CREATE OR REPLACE 
package body pkg_test as 
--函数体 
    function get(intID number) return myrctype is 
      rc myrctype;  --定义ref cursor变量 
      sqlstr varchar2(500); 
    begin 
      if intID=0 then 
         --静态测试,直接用select语句直接返回结果 
         open rc for select id,name,sex,address,postcode,birthday from student; 
      else 
         --动态sql赋值,用:w_id来申明该变量从外部获得 
         sqlstr := 'select id,name,sex,address,postcode,birthday from student where id=:w_id'; 
         --动态测试,用sqlstr字符串返回结果,用using关键词传递参数 
         open rc for sqlstr using intid; 
      end if; 
   
      return rc; 
    end get; 
   
end pkg_test; 
/

举报

相关推荐

0 条评论