database-schema

问题 I am using PostgreSQL and the default database schema in my Yii2 application. I created a new schema called laboratory and I need to define it in the common/config/main-local.php file. This is my current main-local.php file: <?php return [ 'components' => [ 'db' => [ 'class' => 'yii\db\Connection', 'dsn' => 'pgsql:host=localhost;dbname=travel', 'username' => 'aaaa', 'password' => 'bbbb', 'charset' => 'utf8', ], ], ]; How can I add the laboratory schema in this file? I need both schemas. Is

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 days ago . Improve this question I'm new to the schema part of sql so trying to explore and have doubts on the following, there are two schemas S1 and S2 with table T1 in S1 and T2 in S2: If a user logins to S1 will he be able to the following: Access table T2 How will you grant access to T2

问题 I have a simple MySQL database with some foreign keys on certain table columns. Some of the foreign key columns are set to ON DELETE SET NULL, and it seems to work fine. However, for one of the tables, I can't configure ON DELETE SET NULL - I can only configure ON DELETE CASCADE. The initial tables look like this: CREATE TABLE sessions( session_id int NOT NULL AUTO_INCREMENT PRIMARY KEY, name varchar(50) NOT NULL, UNIQUE KEY uk_sessions(name)) COLLATE utf8_unicode_ci; CREATE TABLE blocks(

问题 Given the schema below, how can a notification system be incorporated? Users need to be notified when someone comments on their Picture or SaleItem along with when someone makes a bid on their SaleItem (through Purchase Offer). The ultimate goal is to have a notification system that will handle SMS, Email, and an internal system messaging system. The complexities of those options will be worked out but I need the basic data model from which they can be built upon. MySql is the DB being used

问题 I'm learning laravel, and I'm stuck on a simple process. I want the tables to be generated as UTF-8 but varchar and text fields are like latin-1. Schema section in guide did not help at all. I found this GitHub entry but it does not work neither (throws me errors). I have a schema like this: <?php class Create_Authors_Table { /** * Make changes to the database. * * @return void */ public function up() { Schema::create('authors',function($table){ //$table->charset('utf8'); //does not work //

问题 Hibernate 4.x and 3.x has method Configuration#validateSchema that allows to verify that current database schema matches the object model. However the method is missing in version 5. How the database schema can be validated in Hibernate 5? 回答1: The functionality was extracted and is accessible through interface SchemaValidator. 来源： https://stackoverflow.com/questions/42013850/validate-database-schema-in-hibernate-5

问题 I have the same question/problem than this post -> peewee - modify db model meta (e.g. schema) dynamically . I want to change the schema field in my Meta class dynamically. This is my code: class GPSPosition(Model): def __init__(self, esquema, vehiculo, fechaFrom): self.esquema = esquema + '_org' self.vehiculo = vehiculo self.fechaFrom = fechaFrom orgid = BigIntegerField() id = BigIntegerField() vehicleid = BigIntegerField() driverid = BigIntegerField() originaldriverid = BigIntegerField(null

问题 I'm having problems with inserting into mongoDB because good objects don't pass the mongoDB validator . To make it worse, the error is a generic: Document failed validation which in a big multi-nested object can make things confusing regarding where exactly this validation fails. myValidatorIs = { validator: { $jsonSchema : { bsonType: "object" , required: [ "price" ] , properties: { price: { bsonType: "double" // price needs to be a double, tried with decimal also. , description: "must be a

问题 I'm having problems with inserting into mongoDB because good objects don't pass the mongoDB validator . To make it worse, the error is a generic: Document failed validation which in a big multi-nested object can make things confusing regarding where exactly this validation fails. myValidatorIs = { validator: { $jsonSchema : { bsonType: "object" , required: [ "price" ] , properties: { price: { bsonType: "double" // price needs to be a double, tried with decimal also. , description: "must be a

问题 I'm creating a Databricks application and the database schema is getting to be non-trivial. Is there a way I can generate a schema diagram for a Databricks database (something similar to the schema diagrams that can be generated from mysql)? 回答1: There are 2 variants possible: using Spark SQL with show databases , show tables in <database> , describe table ... using spark.catalog.listDatabases , spark.catalog.listTables , spark.catagog.listColumns . 2nd variant isn't very performant when you