How to connect navicat to javaweb

Steps to connect to Navicat in Java Web: Add MySQL driver Create connection properties Execute query

How to connect in Java Web Navicat

Step 1: Add MySQL driver

• In the IDE, right-click the project folder and select "Build Path" -> "Add External JARs".
• Browse and select the MySQL driver jar file (usually located in the Navicat installation directory).

Step 2: Create connection properties

• In Java code, create a Connection object:

<code class="java">DriverManager.getConnection("jdbc:mysql://localhost:3306/database_name", "username", "password");</code>

• Replace the following properties with your own MySQL database information:

  • localhost: Database server hostname or IP address
  • 3306: MySQL default port
  • database_name: The name of the database to be connected
  • username: MySQL user Name
  • password: MySQL password

##Step 3: Execute query

Create a
• Statement object to execute the query:

<code class="java">Statement statement = connection.createStatement();</code>

Write and execute the SQL query:

<code class="java">String query = "SELECT * FROM table_name";
ResultSet resultSet = statement.executeQuery(query);</code>

Parse
• ResultSet To get query results:

<code class="java">while (resultSet.next()) {
    // 获取列值并处理
}</code>

Sample code

<code class="java">import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Main {

    public static void main(String[] args) {
        try {
            // 添加 MySQL 驱动器
            Class.forName("com.mysql.cj.jdbc.Driver");

            // 创建连接
            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/database_name", "username", "password");

            // 执行查询
            Statement statement = connection.createStatement();
            String query = "SELECT * FROM table_name";
            ResultSet resultSet = statement.executeQuery(query);

            // 解析查询结果
            while (resultSet.next()) {
                System.out.println("ID: " + resultSet.getInt("id"));
            }

            // 关闭资源
            resultSet.close();
            statement.close();
            connection.close();
        } catch (SQLException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}</code>

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