SQLite, starting from version 3.9.0, includes JSON1, a built-in extension that provides functions to handle JSON data within the database. It allows developers to store, retrieve, and manipulate JSON data using SQL commands. This guide explains how to work with JSON in SQLite using the JSON...
JSON is an acronym for JavaScript Object Notation, that became popular a little over seventeen years ago. JSON is essentially a data format, it was popularized by Douglas Crockford, a well-known programmer with an interesting history who was also involved in the development of JavaScript. JSON h...
The index for a JSON array starts at 0, which is different from the norm for PL/SQL collections, where nested tables and varrays start at index value 1. So the above array has elements defined at index values 0 and 1, not 1 and 2. The ordering of elements in an array is also sig...
SQL EXEC InsertProduct 'Toy car', '{"Price":50,"Color":"White","tags":["toy","children","games"]}' Any client-side language or library that works with string data will also work with JSON data. JSON can be stored in any table that supports thenvarchartype, such as a Memory-optim...
一个 AR 类关联一张数据表, 每个 AR 对象对应表中的一行,对象的属性(即 AR 的特性Attribute)映射到数据行的对应列。 一条活动记录(AR对象)对应数据表的一行,AR对象的属性则映射该行的相应列。 您可以直接以面向对象的方式来操纵数据表中的数据,妈妈再不用担心我需要写原生 SQL 语句啦。
提示: yii\db\ActiveRecord::findOne() 和yii\db\ActiveQuery::one() 都不会添加 LIMIT 1到 生成的 SQL 语句中。如果你的查询会返回很多行的数据, 你明确的应该加上 limit(1) 来提高性能,比如 Customer::find()->limit(1)->one()。除了使用查询生成器的方法之外,你还可以书写原生的 SQL 语句来查询数据...
你可以创建 SQLite,MySQL,PostregSQL,MSSQL 或 Oracle 数据库,Yii 内置多种数据库支持。简单起见,后面的内容将以 MySQL 为例做演示。 信息: 虽然MariaDB 曾经是 MySQL 的直接替代品,但现在已经不再完全正确。如果您希望在 MariaDB 中使用“JSON”支持等高级功能,请查看下面列出的 MariaDB 扩展。 然后在数据库...
For example, the JSON: {"value": "\u00AE"} Will result in the ® character. 5. Conclusion As we have seen, Gson provides a straightforward way to work with JSON and Java primitive types. There are some unexpected behaviors to be aware of, even when dealing with simple primitive types...
https://docs.asp.net/en/latest/tutorials/first-mvc-app/working-with-sql.html TheApplicationDbContextclass handles the task of connecting to the database and mappingMovieobjects to database records. The database context is registered with theDependency Injectioncontainer in theConfigureServicesmethod in...
UsingJSON_VALUEalso allows you to now integrate JSON documents with other data by using SQL. For example, looking for the manager of the department where the employee with the employee number 29863 is assigned: SELECT D.MANAGER FROM DEPT D, JSON_EMP J ...