修改代码,实现查询Context表中的数据,数据库是mysql,使用kotlin实现, override fun select(): List<ContextModel> { }
时间: 2024-05-02 21:23:30 浏览: 144
好的,以下是使用 Kotlin 语言实现查询 Context 表中数据的代码:
```kotlin
import java.sql.DriverManager
data class ContextModel(val id: Int, val context: String)
class ContextDao {
private val url = "jdbc:mysql://localhost:3306/your_database_name"
private val username = "your_username"
private val password = "your_password"
fun select(): List<ContextModel> {
val connection = DriverManager.getConnection(url, username, password)
val statement = connection.createStatement()
val resultSet = statement.executeQuery("SELECT * FROM Context")
val contexts = mutableListOf<ContextModel>()
while (resultSet.next()) {
val id = resultSet.getInt("id")
val context = resultSet.getString("context")
val contextModel = ContextModel(id, context)
contexts.add(contextModel)
}
resultSet.close()
statement.close()
connection.close()
return contexts
}
}
```
你需要将上面代码中的 `your_database_name`,`your_username` 和 `your_password` 替换成你自己的 MySQL 数据库名、用户名和密码。此外,这里使用了 JDBC 连接 MySQL 数据库,所以你还需要将 MySQL 的 JDBC 驱动添加到项目中。
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