IDEA中使用Java语言连接MySQL实现增、删、查操作

1、导入相关的依赖库。需要引入MySQL数据库的驱动库，可以在项目的build.gradle（或pom.xml）文件中添加如下依赖：

```java

// build.gradle

dependencies {

implementation 'mysql:mysql-connector-java:8.0.26'

}

```

2、创建数据库连接。使用Java中的`java.sql.Connection`接口来建立和数据库之间的连接，可以使用MySQL提供的`com.mysql.cj.jdbc.Driver`类来注册数据库驱动。

```java

import java.sql.Connection;

import java.sql.DriverManager;

public class DatabaseConnection {

private static final String URL = "jdbc:mysql://localhost:3306/database_name";

private static final String USERNAME = "username";

private static final String PASSWORD = "password";

public static Connection getConnection() {

Connection connection = null;

try {

Class.forName("com.mysql.cj.jdbc.Driver");

connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);

System.out.println("Connected to the database successfully.");

} catch (Exception e) {

e.printStackTrace();

}

return connection;

}

}

```

3、实现增、删、查操作。根据需要实现相应的方法，可以使用`java.sql.Statement`或`java.sql.PreparedStatement`来执行SQL语句。

```java

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class DatabaseOperations {

private static final String TABLE_NAME = "table_name";

public static void insertData(String data) {

try {

Connection connection = DatabaseConnection.getConnection();

Statement statement = connection.createStatement();

String sql = "INSERT INTO " + TABLE_NAME + " (column_name) VALUES ('" + data + "')";

statement.executeUpdate(sql);

System.out.println("Data inserted successfully.");

} catch (SQLException e) {

e.printStackTrace();

}

}

public static void deleteData(int id) {

try {

Connection connection = DatabaseConnection.getConnection();

Statement statement = connection.createStatement();

String sql = "DELETE FROM " + TABLE_NAME + " WHERE id = " + id;

statement.executeUpdate(sql);

System.out.println("Data deleted successfully.");

} catch (SQLException e) {

e.printStackTrace();

}

}

public static void retrieveData() {

try {

Connection connection = DatabaseConnection.getConnection();

Statement statement = connection.createStatement();

String sql = "SELECT * FROM " + TABLE_NAME;

ResultSet resultSet = statement.executeQuery(sql);

while (resultSet.next()) {

int id = resultSet.getInt("id");

String data = https://www.yisu.com/ask/resultSet.getString("column_name");

System.out.println("ID: " + id + ", Data: " + data);

}

} catch (SQLException e) {

e.printStackTrace();

}

}

}

```

在上述代码中，`TABLE_NAME`是数据库表的名称，`column_name`是要进行操作的具体列名。

注意：在实际开发中，需要根据具体情况进行异常处理和资源释放，例如在finally块中关闭连接、释放资源。

以上就是使用Java连接MySQL数据库实现增、删、查操作的基本步骤。可以根据具体需求进行修改和扩展。