Queryinterface query. Most of the methods you've learned in this manual are implemented with the help of several methods from the query interface. Think of it as the bridge between your JavaScript code and raw SQL queries. A practical example would combine the two: Syntax:__QUERYINTERFACE(<ITF_Source>,<ITF_Dest>); 1. Sample: Example: queryInterface. IQueryInterface. addConstraint('TableName', { fields: ['source_column_name', 'other_source_column_name'], type: 'foreign key', name: 'custom_fkey_constraint_name', references: { //Required field table: 'target_table_name', fields: ['target_column_name', 'other_target_column_name'] }, onDelete: 'cascade', onUpdate: 'cascade' }); Aug 30, 2022 · Retrieves pointers to the supported interfaces on an object. Apr 25, 2025 · An instance of Sequelize uses something called Query Interface to communicate to the database in a dialect-agnostic way. A prerequisite for explicit conversion is that both ITF_Source and ITF_Dest are derivatives of __System. This interface is implicitly available and requires no library. The first doesn't show that QueryInterface is being called from an existing interface, and the second doesn't assign any value to the pointer (it's an uninitialized pointer). Your examples are incomplete. Jan 4, 2025 · queryInterface is an abstraction layer provided by Sequelize to interact directly with the database. 2. queryInterface. Aug 5, 2015 · QueryInterface is how you get a pointer to those other interfaces on an object. Operand: Interface variable or FB instance. Operand: Interface variable with desired target types. createFunction( 'someFunction', [ {type: 'integer', name: 'param', direction: 'IN'} ], 'integer', 'plpgsql', 'RETURN param + 1;', [ 'IMMUTABLE', 'LEAKPROOF' ], { variables: [ {type: 'integer', name: 'myVar', default: 100} ], force: true }; );. zjfnwgmhluzlfvriapjdxrdqsguvxuxfizzdxajplclxkipeo