Oracle 使用函数 function查询数据返回游标

create or replace function test111(itemNumber in varchar2) return SYS_REFCURSOR 
 is
  return_cursor SYS_REFCURSOR; 
begin
   OPEN return_cursor FOR SELECT 'a' FROM dual WHERE 1 = itemNumber; 
  RETURN return_cursor; 

end test111;

select test111(1) from dual;

适用条件： 在Sql语句过长时可以适用，避免在java代码中有过长的sql代码！

package com.dahuatech.job;

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;

import oracle.jdbc.driver.OracleResultSet;
import oracle.jdbc.driver.OracleTypes;

public class Test {

	public static void main(String[] args) throws Exception {
		Class.forName("oracle.jdbc.driver.OracleDriver");
		String url = "jdbc:oracle:thin:@10.30.5.106:1521:agile9";

		Connection conn = DriverManager.getConnection(url, "agile", "***");
		
		String sql =  "{? = call test111(?)}";
		CallableStatement cst = conn.prepareCall(sql);
		cst.registerOutParameter(1, OracleTypes.CURSOR);
		cst.setString(2, "1");
		cst.execute();
		OracleResultSet rs = (OracleResultSet) cst.getObject(1);
		while (rs.next()) {
			System.out.println(rs.getString("a"));
		}
	}

}