[ Version ( since = "4.2" ) ]
public SqlBuilderId add_field_id (string field_name, string? table_name = null)
Defines an expression representing a field in this, which may be reused to build other parts of a statement, for instance as a parameter to add_cond or add_field_value_id.
Calling this with a null table_name is equivalent to calling
add_id.
For SELECT queries, see select_add_field.
| this |
a SqlBuilder object |
| field_name |
a field name |
| table_name |
a table name, or null |
|
the ID of the new expression, or 0 if there was an error |