Java连接MySQL数据库主要涉及JDBC(Java Database Connectivity)技术。JDBC是Java语言中用来规范客户端程序如何访问数据库的应用程序接口,提供了诸如查询和更新数据库中数据的方法。
Class.forName()
方法加载MySQL的JDBC驱动程序。DriverManager.getConnection()
方法建立与MySQL数据库的连接。executeQuery()
或executeUpdate()
方法执行SQL语句。import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class MySQLConnectionExample {
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
// 加载MySQL驱动程序
Class.forName("com.mysql.cj.jdbc.Driver");
// 建立连接
String url = "jdbc:mysql://localhost:3306/mydatabase?useSSL=false&serverTimezone=UTC";
String user = "username";
String password = "password";
conn = DriverManager.getConnection(url, user, password);
// 创建Statement对象
stmt = conn.createStatement();
// 执行SQL查询语句
String sql = "SELECT id, name FROM users";
rs = stmt.executeQuery(sql);
// 处理结果集
while (rs.next()) {
int id = rs.getInt("id");
String name = rs.getString("name");
System.out.println("ID: " + id + ", Name: " + name);
}
} catch (ClassNotFoundException | SQLException e) {
e.printStackTrace();
} finally {
// 关闭连接
try {
if (rs != null) rs.close();
if (stmt != null) stmt.close();
if (conn != null) conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
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