Ubuntu环境C语言连接MySQL数据库

1 环境部署

• 安装mysql服务端和客户端

sudo apt-get install mysql-server
sudo apt-get install mysql-client

• 安装库

sudo apt-get install libmysqlclient-dev

• 寻找mysql.h

/usr/include/mysql/mysql.h

2 C语言连接MySQL数据库

2.1 Demo1

• 文件名

connect_to_mysql_v0.0.c

• code

#include
#include
#include
#include
#include"/usr/include/mysql/mysql.h"

int main(){
     
    MYSQL *conn;
    MYSQL_RES *res;
    MYSQL_ROW row;
    char server[] = "localhost";
    char user[] = "root";
    char password[] = "123456";
    char database[] = "knowledge";
    conn = mysql_init(NULL);
    if(mysql_real_connect(conn, server, user, password, database, 3306, NULL, 0)){
     
        printf("成功连接数据库knowledge\n");
    }
    if(!mysql_real_connect(conn, server, user, password, database, 3306, NULL, 0)){
     
        fprintf(stderr, "%s\n", mysql_error(conn));
        exit(1);
    }
    if(mysql_query(conn, "select * from knowledge")){
     
        fprintf(stderr, "%s\n", mysql_error(conn));
        exit(1);
    }

    res = mysql_use_result(conn);
    printf("MYSQL Tables: \n");
    while((row=mysql_fetch_row(res)) != NULL){
     
        printf("%s\n", row[0]);
    }

    mysql_free_result(res);
    mysql_close(conn);
    printf("finish\n");
    return 0;
}

• 编译

gcc connect_to_mysql_v0.0.c -o cc -lmysqlclient

• 结果
  

图2.1 搜索结果

2.2 Demo2

• 文件名

connect_to_mysql_v0.0.c

• code

#include
#include
#include
#include
#include"/usr/include/mysql/mysql.h"

int main(int argc, char **argv){
     
    MYSQL *conn;
    MYSQL_RES *res;
    MYSQL_ROW row;
    char server[] = "localhost";
    char user[] = "root";
    char password[] = "123456";
    char database[] = "knowledge";
    conn = mysql_init(NULL);
    if(mysql_real_connect(conn, server, user, password, database, 3306, NULL, 0)){
     
        printf("成功连接数据库knowledge\n");
    }else{
     
        fprintf(stderr, "%s\n", mysql_error(conn));
        exit(1);
    }
    // if(!mysql_real_connect(conn, server, user, password, database, 3306, NULL, 0)){
     
    //     fprintf(stderr, "%s\n", mysql_error(conn));
    //     exit(1);
    // }
    // if(mysql_query(conn, "show tables")){
     
    //     fprintf(stderr, "%s\n", mysql_error(conn));
    //     exit(1);
    // }
    if(mysql_query(conn, "select * from knowledge")){
     
        fprintf(stderr, "%s\n", mysql_error(conn));
        exit(1);
    }else{
     
        res = mysql_use_result(conn);
        printf("MYSQL Tables: \n");
        while((row=mysql_fetch_row(res)) != NULL){
     
            printf("\nQuestion: %s", row[0]);
            printf("\tAnswer: %s", row[1]);
        }
    }

    mysql_free_result(res);
    mysql_close(conn);
    printf("\nfinish!");
    return 0;
}

• 编译

gcc connect_to_mysql_v0.0.c -o cc -lmysqlclient

• 结果

图2.2 搜索结果

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【参考文献】
[1]https://www.cnblogs.com/zhuyp1015/p/3561470.html
[2]https://blog.csdn.net/qq_38422690/article/details/78660454