下面将举一个通过数据库函数来调用存储过程：
创建数据库函数存储过程
CREATE OR REPLACE FUNCTION stu_proc
(
v_id IN NUMBER
)
RETURN VARCHAR2 IS
v_name VARCHAR2(20);
BEGIN
SELECT o.sname INTO v_name FROM student o WHERE o.id=v_id;
RETURN v_name;
EXCEPTION
WHEN OTHERS THEN RETURN '数据未找到';
END;
JAVA通过调用数据库函数调用存储过程
package com.ljq.test;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Types;
public class ProceTest {
public static void main(String[] args) throws Exception {
Connection conn = null;
CallableStatement statement = null;
//?表示函数return的值， stu_proc是数据库函数名
//存储过程的out和in都是以参数传进，这就是函数和存储过程的区别之一
String sql = "{?=call stu_proc(?)}";
try {
conn = ConnUtils.getConnection();
statement = conn.prepareCall(sql);
statement.registerOutParameter(1, Types.VARCHAR);
statement.setInt(2, 36);
statement.execute();
//具体值或数据未找到
String msg=statement.getString(1);
System.out.println(msg);
} catch (SQLException e) {
e.printStackTrace();
} finally {
ConnUtils.free(null, statement, conn);
}
}
}
