Using MyBatis Dynamic SQL: if, choose, trim, foreach, and bind Tags

The tutorial begins by setting up a Maven project with a student table and shows the initial SQL statements for creating and dropping the table.

It then explains the if tag, illustrating how to conditionally add WHERE clauses for name and sex filters, and provides the corresponding dynamic SQL and test output.

Next, the choose tag is introduced to implement if‑else logic, allowing selection by student_id when present, otherwise by name , with an otherwise clause that returns no rows.

The article covers the trim tag (including its where and set usages) to automatically handle leading logical operators and commas, showing how it replaces explicit WHERE 1=1 constructs.

It proceeds to the foreach tag, demonstrating its use for IN queries, batch inserts, and handling collections, arrays, maps, and object properties, with sample mapper methods and generated SQL.

Finally, the bind tag is presented to define OGNL variables for database‑specific functions, such as creating a portable LIKE expression that works on both MySQL and Oracle.

Each section includes the Java mapper interface definitions, the MyBatis XML snippets wrapped in <code>...</code> , and screenshots of test results to verify the dynamic SQL behavior.