设置和返回客户端连接标记

JDBC 客户端具有用于设置和返回客户端连接标签的方法：getClientInfo() 和 setClientInfo()。这些方法可与 SQL 函数 GET_CLIENT_LABEL 和 SET_CLIENT_LABEL 配合使用。

使用这两种方法时，请确保向 setter 和 getter 方法都传递字符串值 APPLICATIONNAME。

setClientInfo() 用于创建客户端标签，而 getClientInfo() 则用于返回客户端标签：

import java.sql.*;
import java.util.Properties;

public class ClientLabelJDBC {

    public static void main(String[] args) {
        Properties myProp = new Properties();
        myProp.put("user", "dbadmin");
        myProp.put("password", "");
        myProp.put("loginTimeout", "35");
        Connection conn;
        try {
            conn = DriverManager.getConnection(
                    "jdbc:vertica://docc05.verticacorp.com:5433/doccdb", myProp);
            System.out.println("Connected!");
            conn.setClientInfo("APPLICATIONNAME", "JDBC Client - Data Load");
            System.out.println("New Conn label: " + conn.getClientInfo("APPLICATIONNAME"));
            conn.close();
        } catch (SQLTransientConnectionException connException) {
            // There was a potentially temporary network error
            // Could automatically retry a number of times here, but
            // instead just report error and exit.
            System.out.print("Network connection issue: ");
            System.out.print(connException.getMessage());
            System.out.println(" Try again later!");
            return;
        } catch (SQLInvalidAuthorizationSpecException authException) {
            // Either the username or password was wrong
            System.out.print("Could not log into database: ");
            System.out.print(authException.getMessage());
            System.out.println(" Check the login credentials and try again.");
            return;
        } catch (SQLException e) {
            // Catch-all for other exceptions
            e.printStackTrace();
        }
    }
}

运行此方法时，会将以下结果打印到标准输出：

Connected!
New Conn Label: JDBC Client - Data Load