java访问mysql数据库代码

最新推荐文章于 2024-03-08 16:10:11 发布

gxiaozhe

最新推荐文章于 2024-03-08 16:10:11 发布

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文章标签： mysql 数据库 java null jdbc import

本文链接：https://blog.youkuaiyun.com/gxiaozhe/article/details/7626885

本文提供了一个使用Java连接MySQL数据库并查询数据的示例代码。该示例展示了如何加载MySQL JDBC驱动，建立数据库连接，执行SQL查询并处理查询结果。

import java.sql.*;

public class TestMysqlConnection {

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");

            conn = DriverManager
                    .getConnection("jdbc:mysql://localhost/mydata?user=root&password=root");
            stmt = conn.createStatement();
            rs = stmt.executeQuery("select * from dept");
            while (rs.next()) {
                System.out.println(rs.getString("deptno"));
            }

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException ex) {

            System.out.println("SQLException: " + ex.getMessage());
            System.out.println("SQLState: " + ex.getSQLState());
            System.out.println("VendorError: " + ex.getErrorCode());
        } finally {
            try {
                if (rs != null) {
                    rs.close();
                    rs = null;
                }
                if (stmt != null) {
                    stmt.close();
                    stmt = null;
                }
                if (conn != null) {
                    conn.close();
                    conn = null;
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }

}