MyBatis Plus Insert Errors: Fix & Troubleshooting Guide

When encountering errors while inserting data with MyBatis Plus, you can troubleshoot and resolve based on the error message. Common error messages and solutions are as follows:

1. Error message: No typehandler found for property
   Solution: This error usually occurs when the property type in the entity class does not match the database field type. You can check if the property type in the entity class is correct, or use the annotation @TableField(typeHandler = XxxTypeHandler.class) to specify the correct type handler.
2. Error message: Mapped Statements collection does not have a value for
   Solution: This error is usually caused by MyBatis Plus not finding the corresponding SQL statement in the Mapper. You can check if the method name in the Mapper interface matches the id of the SQL statement, or if the Mapper scan path is correctly configured.
3. Error message: No constructor found in
   Solution: This error is usually caused by the lack of a parameterless constructor in the entity class. You can manually add a parameterless constructor to the entity class.
4. Error message: Table ‘xxx’ does not exist.
   Solution: This error usually occurs because the corresponding table does not exist in the database. You can check if the table exists in the database, or if the table name is correct.
5. Error message: Field ‘xxx’ does not have a default value
   Solution: This type of error usually occurs when inserting data, where the corresponding field has not been set a default value and no value has been passed. You can check if a default value has been set in the table structure or pass a value for the corresponding field when inserting data.

If the above solutions do not work, it is suggested to provide specific error messages and related code in order to assist you better in solving the problem.