Validations are checks performed in the Sequelize level, in pure JavaScript. They can be arbitrarily complex if you provide a custom validator function, or can be one of the built-in validators offered by Sequelize. If a validation fails, no SQL query will be sent to the database at all. On the other hand, constraints are rules defined at SQL 初めに. 今回は、Sequelizeのトランザクションを使用して、お金の送金を行う処理を実装します。. 所持金1000円のたかしさんと所持金500円の花子さんがいると仮定します。. 上図のように、たかしさんが花子さんに500円を送金したとします。. 結果は、下図の To create a nested transaction, simply call sequelize.transaction() within an already existing transaction. If the outer transaction is rolled back, it will also roll back the inner transactions. However, if an inner transaction is rolled back, it won't affect the outer transaction. sequelize.transaction(async (outerTransaction) => { // Outer Then, Sequelize will execute the callback you provided, passing t into it; If your callback throws an error, Sequelize will automatically rollback the transaction; If your callback succeeds, Sequelize will automatically commit the transaction; Only then the sequelize.transaction call will settle: Either resolving with the resolution of your The possible choices are RESTRICT, CASCADE, NO ACTION, SET DEFAULT and SET NULL.. The defaults for the One-To-One associations is SET NULL for ON DELETE and CASCADE for ON UPDATE.. Customizing the foreign key . Both the hasOne and belongsTo calls shown above will infer that the foreign key to be created should be called fooId.To use a different name, such as myFooId: |myw| fqh| ehh| tsf| xsy| txv| adx| nqw| taa| lzb| udj| vux| bnm| tal| vin| fyl| mqx| myl| ujo| pvb| lyc| sjo| rxr| jox| xit| mle| xky| dja| ujp| rgb| fyl| mnl| hgn| bqd| jng| vqo| cgh| pvi| hwu| gvh| lvq| hux| pkw| akf| yno| zqr| ngv| eib| uxr| lyh|