DATABASE_NAME,null,DATABASE_VERSION){companionobject{privateconstvalDATABASE_NAME="travel.db"privateconstvalDATABASE_VERSION=1}overridefunonCreate(db:SQLiteDatabase){valCREATE_TRAVEL_TABLE=("CREATE TABLE travel
首先,我们在build.gradle.kts文件中添加了对Junit5、Database Rider、数据库驱动、Yaml解析、Jexl表达式等的依赖。 复制 dependencies{testImplementation(kotlin("test"))//junit5testImplementation("org.junit.jupiter:junit-jupiter-api:5.9.0-M1")testImplementation("org.junit.jupiter:junit-jupiter-params:5.9.0-...
We need to create a jpa interface, so that jpa will help us to generate database table according to our Entity data schema: data/JPAInterfaces.kt package com.virtualpairprogrammers.theater.data import com.virtualpairprogrammers.theater.domain.Seat import org.springframework.data.jpa.repository.JpaR...
databaseBuilder( context.applicationContext, AppDatabase::class.java, "user_db" ).fallbackToDestructiveMigration().build().apply { instance = this } } } } 4. 定义API接口 代码语言:javascript 代码运行次数:0 运行 AI代码解释 interface Api { @GET("users/{userName}") fun getUser(@Path("...
name:String,val address:String)funsaveUser(user:User){if(user.name.isEmpty()){throwIllegalArgumentException("Can't save user ${user.id}: empty Name")}if(user.address.isEmpty()){throwIllegalArgumentException("Can't save user ${user.id}: empty Address")}// Save user to the database}...
getDatabaseConfig(); System.out.println("host=" + config2.getHost() + " port=" + config2.port + " username=" + config2.username + " password=" + config2.password); } } 我们可以看到上述Java实现单例模式比较繁琐,而在Kotlin中只需要使用object关键字就可以用简短的代码来实现单例模式。
// Before 1.5.30val containerA = PostgreSQLContainer(DockerImageName.parse("postgres:13-alpine")).apply { withDatabaseName("db") withUsername("user") withPassword("password") withInitScript("sql/schema.sql")}// With compiler option in 1.5.30 or by default starting with 1...
valquery=database.from(Employees).select().where{Employees.id%2eq1} 生成SQL: select*fromt_employeewhere(t_employee.id%?)=? 通过infix 定义自己的运算符 通过运算符重载,Ktorm 能够将 Kotlin 中四则运算符翻译为 SQL 中的相应符号。但是 Kotlin 的运算符重载还有许多的限制,比如: ...
Roomis a database layer on top of an SQLite database that handles many tasks to make developers’ life easier. The equivalent of Room iniOSisCoreData. In this tutorial, I will show you how to insert, read, update and delete data usingRoomthrough a simple notes app. ...
jasync-sqlis a Simple, Netty based, asynchronous, performant and reliable database drivers for PostgreSQL and MySQL written in Kotlin. Show your with a ★ Getting started // Connection to MySQL DBConnectionconnection=MySQLConnectionBuilder.createConnectionPool("jdbc:mysql://$host:$port/$database...