mybatisplus customSqlSegment

MyBatis Plus is a powerful and convenient extension library for MyBatis, a popular Java-based persistence framework. It provides additional features and utilities to simplify database operations and enhance developer productivity.

In MyBatis Plus, the `customSqlSegment` is a method that allows you to provide custom SQL segments in your queries. It is commonly used in dynamic SQL scenarios where the query conditions or fields need to be determined dynamically at runtime.

To use `customSqlSegment`, you can pass a string value as the parameter when calling methods such as `selectList`, `selectPage`, or `update`. This string represents the custom SQL segment that will be appended to the generated SQL statement.

Here is an example of using `customSqlSegment` in MyBatis Plus:

String customSegment = "AND age > 18";
List<User> userList = userMapper.selectList(Wrappers.<User>lambdaQuery().eq(User::getGender, "Male").customSqlSegment(customSegment));

In this example, the `customSqlSegment` is used to append an additional condition to the query. It adds "AND age > 18" to the generated SQL statement, filtering out users with an age less than or equal to 18.

Using `customSqlSegment` can provide flexibility in building dynamic queries with MyBatis Plus. However, it's important to ensure the input is properly validated and sanitized to prevent SQL injection attacks.