Oracle 存储过程返回结果集用
Oracle 存储过程返回结果集用 ref cursor 实现。试验步骤如下：
1. 建立 ref cursor 类型和过程
CREATE OR REPLACE PACKAGE types
AS
TYPE ref_cursor IS REF CURSOR;
END;
/
CREATE TABLE STOCK_PRICES(
RIC VARCHAR(6) PRIMARY KEY,
PRICE NUMBER(7,2),
UPDATED DATE );
/
CREATE OR REPLACE FUNCTION sp_get_stocks(v_price IN NUMBER)
RETURN types.ref_cursor
AS
stock_cursor types.ref_cursor;
BEGIN
OPEN stock_cursor FOR
SELECT ric,price,updated from stock_prices WHERE price < v_price;
RETURN stock_cursor;
END;
2. 用 sqlplus 测试过程
SQL> var results refcursor
SQL> exec :results := sp_get_stocks(20.0)
SQL> print results
3. 从 Java 调用
import java.sql.*;
import java.io.*;
import oracle.jdbc.driver.*;
public class JDBCDemo {
/**
* Compile-time flag for deciding which query to use
*/
private boolean useOracleQuery = true;
/**
* Class name of Oracle JDBC driver
*/
private String driver = "oracle.jdbc.driver.OracleDriver";
/**
* Initial url fragment
*/
private String url = "jdbc:oracle:thin:@";
/**
* Standard Oracle listener port
*/
private String port = "1521";
/**
* Oracle style of calling a stored procedure
*/
private String oracleQuery = "begin ? := sp_get_stocks(?); end;";
/**
* JDBC style of calling a stored procedure
*/
private String genericQuery = "{ call ? := sp_get_stocks(?) }";
/**
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字串连接: CONCAT --------------(expression + expression)
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