与Maven的雪花连接，classpath上的jar

Question

我目前正在尝试与我们的Snowflake数据库建立简单连接。我遵循了他们网站上的文档：https://docs.snowflake.net/manuals/user-guide/jdbc-configure.html并验证连接字符串正确。

但是，每次启动该程序时，我都会收到一个SQLException，指出它找不到jar，或者找不到驱动程序：

[19:28:54] [Server thread/WARN]: driver not found
[19:28:54] [Server thread/WARN]: java.sql.SQLException: No suitable driver found for jdbc:snowflake://d9022.east-us-2.azure.snowflakecomputing.com/
[19:28:54] [Server thread/WARN]:        at java.sql.DriverManager.getConnection(Unknown Source)
[19:28:54] [Server thread/WARN]:        at java.sql.DriverManager.getConnection(Unknown Source)
[19:28:54] [Server thread/WARN]:        at com.mcnations.nationsatwar.jdbc.DatabaseManager.getConnection(DatabaseManager.java:44)
[19:28:54] [Server thread/WARN]:        at com.mcnations.nationsatwar.jdbc.DatabaseManager.init(DatabaseManager.java:50)
[19:28:54] [Server thread/WARN]:        at com.mcnations.nationsatwar.jdbc.DatabaseManager.<init>(DatabaseManager.java:19)
[19:28:54] [Server thread/WARN]:        at net.mcnations.nationsatwar.Player.NationPlayer.<init>(NationPlayer.java:54)
[19:28:54] [Server thread/WARN]:        at net.mcnations.nationsatwar.NationsInitializer.playerLogin(NationsInitializer.java:78)

我将Maven用于依赖项。在我的POM中，我仅具有：

<!-- https://mvnrepository.com/artifact/net.snowflake/snowflake-jdbc -->
        <dependency>
            <groupId>net.snowflake</groupId>
            <artifactId>snowflake-jdbc</artifactId>
            <version>3.9.2</version>
        </dependency>

即使陈述了Maven依赖关系（根据Snowflake的文档），我仍然遇到no driver exception。然后，我将jar添加到构建路径中，并希望（也许）在构建路径上既需要maven依赖关系，又需要实际的.jar文件。这不能解决问题。

此时，我很茫然。我不知道自己在做什么错，也不知道如何解决。

我的连接类别：

package com.mcnations.nationsatwar.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

import net.mcnations.nationsatwar.Player.NationPlayer;

public class DatabaseManager {

    private NationPlayer player;

    public DatabaseManager(NationPlayer player) throws SQLException{
        this.player = player;

        init();

    }

    private static Connection getConnection() throws SQLException{


        try {

            Class.forName("net.snowflake.client.jdbc.SnowflakeDriver");

        }catch(ClassNotFoundException ex) {

            System.err.println("driver not found");
        }

        Properties properties = new Properties();

        properties.put("user", "NationsUser");
        properties.put("password", "//myPassword");
        properties.put("db", "//myDB");
        properties.put("role", "SYSADMIN");

        String connectStr = "jdbc:snowflake://9022.east-us-2.azure.snowflakecomputing.com/";

        return DriverManager.getConnection(connectStr, properties);

    }

    private static void init() throws SQLException{

        Connection connObject = getConnection();

        Statement statement = connObject.createStatement();

        ResultSet rSet = statement.executeQuery("SELECT * FROM PlayerData");

        if(rSet == null) {
            System.out.println("rSet is null");
        }
        else {
            System.out.println(rSet.next());
        }

    }

}

Answer 1

当您尝试使用Java程序连接Snowflake数据库时，发生错误“ java.sql.SQLException：没有为java.sql.SQLException找到合适的驱动程序：jdbc：snowflake：//.snowflakecommputing.com没有找到合适的驱动程序，但是要么您没有Snowflake JDBC驱动程序{ex。在调用getConnection（）方法之前，未在您的类路径或驱动程序中注册雪花-jdbc-3.11.0.jar。

您能否确保已将Snowflake JDBC驱动程序“ snowflake-jdbc-3.11.0.jar”包含在Build库路径中。