Question

我正在使用Springs SimpleJdbcCall运行存储过程，如下所示：

SimpleJdbcCall jdbcCall = new SimpleJdbcCall(jdbcTemplate).withProcedureName("example_proc");
jdbcCall.execute();
// do other stuff on other subsystems
// the sysout below is just an example - the real scenario was somewhat different
System.out.println("Supposedly after the end of the stored procedure call");

存储过程运行了很长时间，并且与之后发生的事情重叠。

存储过程是用Microsoft的SQL Server方言编写的，看起来像这样：

CREATE PROCEDURE example_proc
AS
BEGIN
    INSERT INTO example_table_1 SELECT * FROM example_table_2
    UPDATE example_table_1 SET col1 = 'a' WHERE ...
END

问题是：如何确保SimpleJdbcCall等到存储过程完成？

Answer 1

对此有一个技巧：使存储过程返回某些内容，然后在jdbc调用中对其进行检索。

这是存储过程：

CREATE PROCEDURE example_proc
AS
BEGIN
    INSERT INTO example_table_1 SELECT * FROM example_table_2
    UPDATE example_table_1 SET col1 = 'a' WHERE ...

    -- this is just a hack for running it synchronously:
    SELECT 1 AS success
END

现在它返回了一些内容，jdbc调用可以等待：

SimpleJdbcCall jdbcCall = new SimpleJdbcCall(jdbcTemplate)
        .withProcedureName("example_proc").
        returningResultSet("success", new SingleColumnRowMapper<Integer>());
Map<String, Object> map = jdbcCall.execute();
@SuppressWarnings("unchecked")
List<Integer> storedProcedureResults = (List<Integer>) map.get(success);
int result = storedProcedureResults.get(0);
// I did something to the result. I am not sure if this is really necessary.
// But I was worried if the jvm or javac would optimize the dead code.
// I returned the value from a method. Printing it should also be enough.
System.out.println(result);

如何使用SimpleJdbcCall同步调用存储过程

1 个答案: