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。