exceptions.md

title	tags
DML exceptions	core_dml DB API core exception

The DML API uses a selection of exceptions to indicate errors.

Types of exception

dml_connection_exception

Thrown when can not connect to database for any reason.

dml_read_exception

Problem occurred during reading from database. Originally indicated be returning false - this value was often confused with false return value meaning not found.

dml_write_exception

Problem occurred during writing to database. Originally indicated be returning false.

See also

• Exceptions: General guidelines for using of exceptions in Moodle 2.0
• DML functions: Where all the functions used to handle DB data. (DML) are defined.
• DDL functions: Where all the functions used to handle DB objects (DDL) are defined.