java -postgresql在插入时最后插入的id不能获取 [英] java -postgresql last inserted id on insertion not getting

问题描述

我有一个插入postgresql的功能，如下所示:

I have a function for insertion in postgresql as follows:

CREATE OR REPLACE FUNCTION insert_orderhead(order_id integer, order_dt text, customer_id integer, route_id integer, routenum integer, ordertype text, create_station_id integer, create_stationtype text, create_time text, create_user_id integer, tran_time text, tran_user_id integer) RETURNS integer AS $BODY$
INSERT INTO ordermaster
VALUES(DEFAULT,
       order_dt,
       customer_id,
       route_id,
       routenum,
       ordertype,
       create_station_id,
       create_stationtype,
       create_time,
       create_user_id,
       tran_time,
       tran_user_id) returning order_id $BODY$ LANGUAGE SQL VOLATILE COST 100;


ALTER FUNCTION insert_orderhead(integer, text, integer, integer, integer, text, integer, text, text, integer, text, integer) OWNER TO postgres;

我正在使用Java进行插入，并且调用如下:

And I am using java to insert and I am calling as follows:

cstorderhead = conn.prepareCall("{call insert_orderhead(?,?)}");
                    cstorderhead.setString(1, order_date);
                    cstorderhead.setInt(2, custidup);
                       .........
                    cstorderhead.executeUpdate();

该值已正确插入.

我需要返回最后插入的ID ，这里是串行自动增量.

I need to return the last inserted id here it is the serial auto increment.

我尝试如下:

ResultSet rstd = cstorderhead.getGeneratedKeys();
                    if (rstd.next()) {
                        int newId = rstd.getInt(1);
                            out.print("Value returned=="+newId);
                    }

但是它不返回最后插入的ID.我需要对代码进行哪些更改才能得到它?

But it is not returning the last inserted id. What change I need to make my code to get it?

这是表的定义:

create table ordermaster 
(
  order_id serial NOT NULL, order_dt text, customer_id integer, route_id integer, routenum integer, ordertype text, create_station_id integer, create_stationtype text, create_time text, create_user_id integer, tran_time text, tran_user_id integer, CONSTRAINT order_id PRIMARY KEY (order_id)
);

推荐答案

您不能将getGeneratedKeys()与CallableStatement一起使用.但是，由于您的insert在函数中被隐藏"，因此您也不能将常规的PreparedStatement与getGeneratedKeys()一起使用，因为驱动程序会将RETURNING子句附加到SQL语句中-不适用于函数调用.

You can't use getGeneratedKeys() with a CallableStatement. However as your insert is "hidden" in the function, you also can't use a regular PreparedStatement with getGeneratedKeys() because the driver will append a RETURNING clause to the SQL statement - which doesn't work with a function call.

我看到了两种解决您的问题的方法:

I see two solutions to your problem:

CREATE OR REPLACE FUNCTION insert_orderhead(
    p_order_id integer, 
    p_order_dt text, 
    p_customer_id integer, 
    p_route_id integer, 
    p_routenum integer, 
    p_ordertype text, 
    p_create_station_id integer, 
    p_create_stationtype text, 
    p_create_time text, 
    p_create_user_id integer, 
    p_tran_time text, 
    p_tran_user_id integer)
  RETURNS integer AS
$BODY$
   INSERT INTO ordermaster 
     (order_dt, customer_id, route_id, routenum, ordertype, create_station_id, create_stationtype, create_time,create_user_id,tran_time, tran_user_id)
   values 
     (p_order_dt, p_customer_id, p_route_id, p_routenum, p_ordertype, p_create_station_id, p_create_stationtype, p_create_time, p_create_user_id, p_tran_time, p_tran_user_id) 
   returning  orderline_id;
$BODY$
  LANGUAGE sql VOLATILE
  COST 100;

请注意，我删除了未使用的order_id参数，并将其重命名为其他两个参数-因为通常不建议使用与列名称相同的参数.

Note that I removed the unused order_id parameter and renamed the other two parameters - because it is usually not a good idea to have parameters with the same name as columns.

然后在您的代码中可以使用如下功能:

Then in your code you can use the function like this:

PreparedStatement pstmt = con.prepareStatement("select insert_order(?,?)");
pstmt.setString(1, "foo");
pstmt.setInt(2, 42);

rs = pstmt.executeQuery();

if (rs.next()) {
  System.out.println("Generated ID is: " + rs.getInt(1));
}

2.手动查询序列:

调用函数后，可以运行另一条语句来获取最后生成的序列值:

2. Query the sequence manually:

After calling your function, you can run another statement to obtain the last generated sequence value:

ResultSet rs = stmt.executeQuery("select lastval()");
if (rs.next()) {
  System.out.println("Generated ID is: " + rs.getInt(1));
}

以上内容仅在该函数未插入多个表的情况下有效.如果是这样，则需要将currval()与序列名一起使用:

The above will only work if the function doesn't insert into multiple tables. If it does, you need to use currval() with the sequence name:

ResultSet rs = stmt.executeQuery("select currval('ordermaster.order_id_seq')");
if (rs.next()) {
  System.out.println("Generated ID is: " + rs.getInt(1));
}

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