How to connect to an Impala database using JDBC?

To connect to the Impala database, you need to use the Impala JDBC driver. The steps to connect to the Impala database are as follows: 1. Download the Impala JDBC driver, which can be downloaded from Cloudera’s official website. 2. Unzip the downloaded JDBC driver (e.g. `impala-jdbc-2.6.12.1007.zip`) to a suitable location. 3. In your Java project, add the unzipped JDBC driver (e.g. `impala-jdbc-2.6.12.1007.jar`) to the project’s dependencies. 4. In your code, use the `getConnection` method of the `java.sql.DriverManager` class to establish a connection to the Impala database. Example code is as follows:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class ImpalaJdbcExample {
    public static void main(String[] args) {
        try {
            // 加载JDBC驱动程序
            Class.forName("com.cloudera.impala.jdbc41.Driver");
            // 建立与Impala数据库的连接
            String connectionString = "jdbc:impala://[Impala服务器]:[端口]/[数据库名称]";
            Connection connection = DriverManager.getConnection(connectionString);
            // 在此处执行数据库操作
            // 关闭连接
            connection.close();
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }
    }
}

Please note that `[Impala server]` is the hostname or IP address of the Impala server, `[port]` is the port number of the Impala server (usually 21050), and `[database name]` is the name of the Impala database you want to connect to. 5. Perform the necessary database operations, such as querying data, inserting data, and so on. 6. Finally, remember to close the connection to the Impala database to release resources. These are the basic steps to connect to the Impala database, and you can carry out further database operations as needed.