In MyBatis, what type should be used when comparing Java types with MySQL's datetime types?

In MyBatis, comparing Java types with MySQL's datetime types is a common problem in database operations. Especially in time-frame queries, it is crucial to correctly select Java types.

You used the Java String type to compare with the MySQL datetime type, as shown below:

 SELECT x.* FROM my.`user` x where time BETWEEN '2024-02-28 22:35:59' and '2024-02-28 22:36:58'

This approach is not entirely wrong, but it has potential risks. String types rely on the database's string sorting rules, which can lead to precision issues or unpredictable results.

A more recommended approach is to use Java's java.util.Date or java.sql.Timestamp type. These two types represent time more accurately, avoiding the ambiguity of string comparisons. The key lies in the setting of parameterType in the XML configuration file of MyBatis:

• parameterType="java.util.Date" : Pass the Date object. MyBatis will automatically convert Date object to a date and time format that MySQL can recognize.

• parameterType="java.sql.Timestamp" : Passing Timestamp object is more appropriate for comparisons that require millisecond precision.

Both methods can achieve comparison with the MySQL datetime type, but it should be noted that if you use String type, you must ensure that the datetime format of the string is compatible with the datetime type of the MySQL database, such as 'YYY-MM-DD HH:mm:ss'.

Therefore, it is recommended to prioritize the use of java.util.Date or java.sql.Timestamp to improve the readability and reliability of the code and avoid errors caused by inconsistent date formats. Which type you choose depends on your accuracy requirements and the configuration of MyBatis.

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