在Netbeans中连接azure数据库的Java程序

Question

这是我的代码：请帮助我如何用java程序连接我的数据库到azure！！！

public class App {

    public static void main(String[] args) {

        // Connect to database
        String hostName = "testchinnaa.database.windows.net:1433"; // update me
        String dbName = "Test_Gopi"; // update me
        String user = "chinna"; // update me
        String password = "******"; // update me

        String url = String.format("jdbc:sqlserver://testchinnaa.database.windows.net:1433;database=Test_Gopi;user=chinna@testchinna;password=*****;encrypt=true;trustServerCertificate=false;hostNameInCertificate=*.database.windows.net;loginTimeout=30;"
            + "hostNameInCertificate=*.database.windows.net;loginTimeout=30;", hostName, dbName, user, password);
        Connection connection = null;
        try {
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            connection = DriverManager.getConnection(url);
            String schema = connection.getSchema();
            System.out.println("Successful connection - Schema: " + schema);

            System.out.println("Query data example:");
            System.out.println("=========================================");

            // Create and execute a SELECT SQL statement.
            String selectSql = "SELECT TOP 20 pc.Name as CategoryName, p.name as ProductName "
                + "FROM [SalesLT].[ProductCategory] pc "  
                + "JOIN [SalesLT].[Product] p ON pc.productcategoryid = p.productcategoryid";

            try (Statement statement = connection.createStatement();
            ResultSet resultSet = statement.executeQuery(selectSql)) {

                // Print results from select statement
                System.out.println("Top 20 categories:");
                while (resultSet.next())
                {
                    System.out.println(resultSet.getString(1) + " "
                        + resultSet.getString(2));
                }
                connection.close();
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Answer 1

对不起，您必须弄清楚您使用的是MySql还是MSSQL。你说你用的是MySQL。但是，在您的连接字符串中，它是一个sqlserver，这意味着它是一个MSSQL。

下面是使用Java访问数据库的教程：

>

您需要为数据库下载连接器：

手动将连接器jar文件添加到您的类路径中。也可以使用Maven dependencies manager在项目中安装和配置连接器/J库。

<!-- Example for mysql -->
<dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>8.0.18</version>
</dependency>

代码示例

>

对于MSSQL:

try {
    Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
    connection = DriverManager.getConnection("conntection_string");
    String SQL = "SELECT name FROM sysdatabases;";

    try (Statement statement = connection.createStatement();
         ResultSet resultSet = statement.executeQuery(SQL)) {

        // Print results from select statement
        while (resultSet.next()) {
            System.out.println(resultSet.getString(1));
        }
        connection.close();
    }
} catch (Exception e) {
    e.printStackTrace();
}

Connection conn = null;
ResultSet rs = null;
try {
    Class.forName("com.mysql.cj.jdbc.Driver");
    String connectionUrl = "jdbc:mysql://{server_name}.mysql.database.azure.com:3306?useSSL=true&requireSSL=false&serverTimezone=UTC";;
    conn = DriverManager.getConnection(connectionUrl, "username_from_portal, like: jack@mysqldemo258", "password");
    rs = conn.prepareStatement("show databases").executeQuery();

    while(rs.next()){
        System.out.println(rs.getString(1));
    }
} catch (ClassNotFoundException e) {
    e.printStackTrace();
} catch (SQLException e) {
    e.printStackTrace();
} finally {
    try{
        if(rs != null) rs.close();
        if(conn != null) conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}