What is the purpose of the foreach statement in MyBatis?

In MyBatis, the foreach statement is used to iterate through elements in a collection or array in an SQL query, and insert them at specific positions in the SQL statement.

The functions of the foreach statement are as follows:

1. One way to iterate through a collection or array is by using a foreach statement, which allows you to access each element individually for processing, such as in a List, Set, or Array.
2. Dynamically generate SQL statements: By specifying the property name of a collection or array within a foreach statement, you can dynamically create the parameter part of the SQL statement. This helps avoid manually concatenating SQL statements, improving the readability and maintainability of the code.
3. Batch insert or update: Batch insert or update operations can be achieved through a foreach statement. By using the elements in a collection or array as parameters for insertion or update, the number of interactions with the database can be reduced, resulting in improved efficiency in data operations.

In general, the purpose of the foreach statement is to conveniently handle elements in a collection or array, and insert them into specific positions in an SQL statement, allowing for dynamic SQL statement generation and batch operations.