面试概率极大的Oracle存储过程
时间:2021-07-01 10:21:17
帮助过:31人阅读
- CREATE OR REPLACEPROCEDURE 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;
- BEGIN
- END 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:
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- BEGIN
- SELECT col1,col2 into 变量1,变量2 FROM typestruct where xxx;
- EXCEPTION
- WHEN NO_DATA_FOUND THEN
- xxxx;
- END;
一:无返回值的存储过程
存储过程为:
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- CREATE OR REPLACE PROCEDURE TESTA(PARA1 IN VARCHAR2,PARA2 IN VARCHAR2) AS
- BEGIN
- INSERT INTO HYQ.B_ID (I_ID,I_NAME) S (PARA1, PARA2);
- END TESTA;
然后呢,在Java里调用时就用下面的代码:
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- 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:
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- 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:
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- 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:
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- 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:
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- 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:
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- 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。
面试概率极大的Oracle存储过程
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