通过应用程序访问RDS MySQL数据库

参数说明

示例代码中的参数说明如下。

示例代码

Java示例代码

<dependency>
 <groupId>mysql</groupId>
 <artifactId>mysql-connector-java</artifactId>
 <version>8.0.27</version>
</dependency>

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class DatabaseConnection
{
    public static void main(String args[]) {
        String connectionUrl= "jdbc:mysql://<Host>:<Port>/<myDatabase>";    

        ResultSet resultSet;

        try (Connection connection=DriverManager.getConnection(connectionUrl,"<myUsername>","<myPassword>");  
             Statement statement = connection.createStatement()) {

            String selectSql = "SELECT * FROM `courses`";            //输入希望执行的SQL。
            resultSet = statement.executeQuery(selectSql);

            while (resultSet.next()) {
                System.out.println(resultSet.getString("name"));
            }
        }
        catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

Python3示例代码

import pymysql

connection = pymysql.connect(host='<Host>',     
                       port=<Port>,
                       user='<myUsername>',
                       passwd='<myPassword>',
                       db='<myDatabase>')

try:
    with connection.cursor() as cursor:
        sql = "SELECT * FROM `courses`"
        cursor.execute(sql)
        for result in cursor:
             print(result)
finally:
    connection.close()

C示例代码

sudo yum install mysql-devel

#include <stdio.h>
#include <mysql.h>
#include <string.h>

int main(void)
{
    MYSQL *t_mysql;

    MYSQL_RES       *res = NULL;
    MYSQL_ROW       row;
    char            *query_str = NULL;
    int             rc, i, fields;
    int             rows;

    char select[] = "select * from courses";    // 输入希望执行的SQL。
    t_mysql = mysql_init(NULL);

    if(NULL == t_mysql){
        printf("init failed\n");
    }

    if(NULL == mysql_real_connect(t_mysql, "<Host>", "<myUsername>", "<myPassword>", "<myDatabase>",
            <Port>, NULL, 0)){
        printf("connect failed\n");
    }

    if(mysql_real_query(t_mysql, select, strlen(select)) != 0){
        printf("select failed\n");
    }

    res = mysql_store_result(t_mysql);
    if (NULL == res) {
         printf("mysql_restore_result(): %s\n", mysql_error(t_mysql));
         return 0;
    }

    fields = mysql_num_fields(res);
    while ((row = mysql_fetch_row(res))) {
        for (i = 0; i < fields; i++) {
            printf("%s\t", row[i]);
        }
        printf("\n");
    }
    mysql_close(t_mysql);

}
                    

连接失败

连接失败时，建议根据报错信息来解决连接问题。

更多连接方案

• 您可以通过函数计算访问云数据库 RDS MySQL 版，在函数中配置专有网络VPC相关信息并在数据库中配置白名单，实现VPC内数据库的访问和操作。具体操作，请参见访问RDS MySQL示例。

• 更多访问RDS MySQL数据库的示例，请参见函数计算Python访问MySQL数据库。