【08】CallableStatement

1. CallableStatement

• java.sql包

• 用于执行 SQL 存储过程的接口

• 继承自PreparedStatement

   public interface CallableStatement extends PreparedStatement
  

2. 调用没有返回值的存储过程

2.1 存储过程

	create or replace procedure test_a(param1 in varchar2, param2 in varchar2)
	  as
	begin
	      insert into Dept(deptno,dname) values(param1, param2);
	end;

2.2 代码实现

	Connection conn = ConnectionUtil.getConnection();
	CallableStatement cstmt = null;
	try {
		int deptNo = 26;
		String dname = "dname26";
			
		//实例化
		cstmt = conn.prepareCall("{call test_a(?,?)}");
		//设置参数
		cstmt.setInt(1, deptNo);
		cstmt.setString(2, dname);
		
		//执行
		int i = cstmt.executeUpdate();
		System.out.println("影响行数："+i);
	} catch (Exception e) {
		e.printStackTrace();
	} finally {
		ConnectionUtil.closeCallableStatement(cstmt);
		ConnectionUtil.closeConnection(conn);
	}

3. 调用有返回值的存储过程

3.1 存储过程

此存储过程通过传入的参数（Name），返回一个参数（address）。

     create or replace procedure demo_procedure(namedemo in varchar2,addressdemo out varchar2)
    	as
   	 begin 
    	select address into addressdemo from system.demo where name=namedemo;
     end;

2.2 代码实现

   	Connection conn = ConnectionUtil.getConnection();
   	CallableStatement cstmt = null;
    try {  
        cstmt = conn.prepareCall("{ call dem_procedure(?,?) }");  
        cstmt .setString(1, "kalision");  
        cstmt .registerOutParameter(2, Types.VARCHAR);  // 注册输出参数
        cstmt .execute();  
        String testPrint = cstmt .getString(2);  
        System.out.println("存储过程返回的值是："+testPrint);  
    } catch (Exception ex) {  
        ex2.printStackTrace();  
    } finally{  
      	ConnectionUtil.closeCallableStatement(cstmt);
		ConnectionUtil.closeConnection(conn);
	}