The maximum expression in Oracle database message list is 1000 error

oracle The maximum expression in the database message list is 1000 error

1. explain ：
This error refers to sql in in The maximum number of parameters in cannot exceed 1000 individual , This is a oracle The database is set like this .
2. Background reproduction ：
When developing in a formal environment , Because the amount of data will be very large , Will meet in（） The parameters in parentheses have exceeded 1000 Circumstances , In this case , The error will be reported again , The screenshot is as follows ：

3. Solutions ：
From the above, we can find that , as long as in The parameters of are guaranteed in 1000 within , Then the error message will not appear . therefore , The core idea for us to solve this problem is to avoid in The parameter of exceeds 1000.
4. Solution ：
I have two solutions ：
1. If the background is used sql Splicing method ： Can be in in When , Write another if Judge , When you want In Parameters of index The numerical value is taken as 999 The mold for 0, I'll do it again in（ Put the data behind ）
2. If you are using xml The document says sql, be used sql Dynamic Tags , The idea is the same as the plan , I am far from showing the code writing of scheme 2 ：

   select name,sex,age from man where id in
        <foreach collection="idList" index="index" open="(" close=")" separator="," item="id">
            <!-- Prevent data from exceeding 1000 Report errors -->
            <if test="(index % 999) == 998">
             0 )
             or id in (
             </if>
              #{id}
        </foreach>

The final general appearance is like this ：

select name,sex,age from  man where id in (1,2,3) or id in (4,5,6) or id in (7,8,9)...

5. Conclusion ：
Error reporting through this , We will find that , yes , we have bug It's invisible , In this data environment , There's nothing wrong with your code , But a different data environment , There will be problems , When developing later , Think as much as possible if the current amount of data becomes larger , Will there be any problems , How to avoid this problem ; Finally, I hope my article can help you .