JDBC工具類

public class JDBCUtils {
    private static String driver = "oracle.jdbc.OracleDriver";
    private static String url = "jdbc:oracle:thin:@192.168.79.128:1521/orcl";
    private static String user = "scott";
    private static String password = "tiger";
    
    
    static{
        //註冊驅動
        
 
//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;
    }
    
    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;
            }
        }
    }
}

存儲過程

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

java代碼

@Test
    public void testProcedure(){
        //jdbc調用存儲過程sql語句:
        //{call <procedure-name>[(<arg1>,<arg2>, ...)]}
        String sql = "{call queryEmpInformation(?,?,?,?)}";
        
        Connection conn = null;
        CallableStatement call = null;
        
        try{
            conn = JDBCUtils.getConnection();
            call = conn.prepareCall(sql);
            
            //輸入參數賦值
            call.setInt(1, 7839);
            
            //輸出參數，聲明為輸出參數
            call.registerOutParameter(2, OracleTypes.VARCHAR);
            call.registerOutParameter(3, OracleTypes.NUMBER);
            call.registerOutParameter(4, OracleTypes.VARCHAR);
            
            //執行
            call.execute();
            
            //獲取值
            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);
        }
    }

存儲函數

--存儲函數
create or replace function queryEmpIncome(eno in number)
return number
is
psal emp.sal%type;
pcomm emp.comm%type;
begin
  select sal,comm into psal,pcomm from emp where empno = eno;
  return psal*12+nvl(pcomm,0);
end queryEmpIncome;

java代碼

@Test
    public void testFuntion(){
        //jdbc調用存儲函數sql語句：
        //{?= call <procedure-name>[(<arg1>,<arg2>, ...)]}
        String sql = "{? = call queryEmpIncome(?)}";
        
        Connection conn = null;
        CallableStatement call = null;
        
        try{
            conn = JDBCUtils.getConnection();
            call = conn.prepareCall(sql);
            
            //註冊輸出參數
            call.registerOutParameter(1, OracleTypes.NUMBER);
            //輸入參數
            call.setInt(2, 7839);
            
            //執行
            call.execute();
            
            //取出返回值
            double income = call.getDouble(1);
            System.out.println("年薪："+income);
        }catch (Exception e){
            e.printStackTrace();
        }finally{
            JDBCUtils.release(conn, call, null);
        }
    }

out參數遊標

--創建包頭
create or replace package mypackage 
is
--定義一個cursor類型變量
type empcursor is ref cursor;
procedure queryEmpList(dno in number,empList out empcursor);
end mypackage;


--創建包體
create or replace package body mypackage is
  procedure queryEmpList(dno in number,empList out empcursor)
    as
    begin
      open empList for select * from emp where deptno = dno;
      end;
end mypackage;

java代碼

@Test
    public void testCursor(){
        String sql = "call mypackage.queryEmpList(?,?)";
        
        Connection conn = null;
        CallableStatement call = null;
        ResultSet rs = null;
        
        try{
            conn = JDBCUtils.getConnection();
            call = conn.prepareCall(sql);
            
            call.setInt(1, 20);
            call.registerOutParameter(2, OracleTypes.CURSOR);
            
            call.execute();
            
            rs = ((OracleCallableStatement)call).getCursor(2);
            while(rs.next()){
                String name = rs.getString("ename");
                double sal = rs.getDouble("sal");
                System.out.println(name+"\t"+sal);
            }
        }catch (Exception e){
            e.printStackTrace();
        }finally{
            JDBCUtils.release(conn, call, null);
        }
    }

JDBC操作存儲過程、存儲函數、out參數使用遊標