Mysql的C语言API接口在项目中的使用

#include "Mysql.h"


int  Mysql::select_user_store(char *sql,char *user_info)
{   

    int reta = mysql_real_query1(sql);
    if ( 0 != reta){
        return (-1);
    }
    //process result  
    result = mysql_store_result(conn);  
    if (result == NULL){  
        if (mysql_error(conn))  
            fprintf(stderr, "%s\n", mysql_error(conn));  
        else  
            fprintf(stderr, "%s\n", "unknown error\n");  
        return -1;  
    }  

    row = mysql_fetch_row(result);
    if (!row)
    {
        cout << "the user you selected not exist!" << endl;
        return -2;
    }

    if (user_info == NULL)
    {
        return 0;
    }
    sprintf(user_info, "%s:%s:%s:%s:%s:%s:%s:%s", row[0], row[1],row[2],row[3],row[4],row[5],row[6],row[7]);

    return (0);
}   

Mysql::Mysql():result(NULL),conn(NULL),row(NULL)
{
    //create connection to MySQL  
    conn = mysql_init(NULL);  
    if (mysql_real_connect(conn, "localhost", "root", "123", "soft", 0, NULL, 0) == NULL){  
        fprintf(stderr, "Sorry, no database connection ...\n");
        mysql_query(conn, "SET NAMES 'utf8'");  

    }
}

Mysql::~Mysql()
{
    //release memory, server connection  
    if (result)
    {
        mysql_free_result(result);  
    }
    mysql_close(conn);  
}



int Mysql::add_user(char user_info[8][512])
{
    char sql[MAX_SQL_LEN];
    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"insert into usrs(name,tel,mail,work,creater,create_time,privilege,passwd) values('%s','%s','%s','%s','%s','%s','%s','%s')",user_info[0],user_info[1],user_info[2],user_info[3],user_info[4],user_info[5],user_info[6],user_info[7]);

    return mysql_real_query1(sql); 
}

int Mysql::delete_user(char *name)
{
    char sql[MAX_SQL_LEN];
    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"delete from usrs where name = '%s'",name);

    return mysql_real_query1(sql);
}

int Mysql::select_users_name(char **p)
{
    char sql[MAX_SQL_LEN];

    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"select name from usrs");
    int ret = mysql_real_query1(sql);
    if (ret != 0)
        return -1;

    result = mysql_store_result(conn);
    unsigned int num = mysql_field_count(conn);
    unsigned int count = mysql_num_rows(result);
    cout << "users name count:" << count << endl;
    char *buffer = new char[count * 8];
    bzero(buffer, count * 8);
    while (row = mysql_fetch_row(result))
    {
        for (unsigned int i = 0; i < num; i++)
        {
            strcat(buffer, row[i]);
            strcat(buffer, ":");
        }
    }
    *p = buffer;

    return 0;
}
int Mysql::select_user(char* acnt,char *user_info)
{
    if (NULL == acnt){  //如果输入acnt为NULL,则返回为-1
        return (-1);
    }

    char sql[MAX_SQL_LEN];

    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"select * from usrs where name = '%s'",acnt);
    cout << sql << endl;

    return  select_user_store(sql, user_info);
}


int Mysql::update_user(char user_info[8][512])
{
    char sql[MAX_SQL_LEN];

    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"update usrs set name = '%s',tel = '%s',mail='%s',work = '%s',privilege = '%s',passwd = '%s'where name = '%s'",user_info[0],user_info[1],user_info[2],user_info[3],user_info[4],user_info[5], user_info[0]);
    printf("update usrs set name = '%s',tel = '%s',mail='%s',work = '%s',creater = '%s',create_time = '%s',role = '%s',passwd = '%s'\n",user_info[0],user_info[1],user_info[2],user_info[3],user_info[4],user_info[5],user_info[6],user_info[7]);

    return mysql_real_query1(sql);  
}

int Mysql::update_privilege(char *str)
{
    char sql[MAX_SQL_LEN];
    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"update privilege set id1 = '%c',id2='%c',id3 = '%c',id4 = '%c',id5 = '%c',id6 = '%c',id7 = '%c', id8 = '%c', id9 = '%c', id10 = '%c' where name = 'system'",str[0],str[1],str[2],str[3],str[4],str[5],str[6],str[7], str[8], str[9]);

    if (mysql_real_query1(sql))
    {
        return -1;
    }

    for (int i = 1; i <= 10; i++)
    {
        if (str[i-1] == '0')
        {
            bzero(sql,MAX_SQL_LEN);
            sprintf(sql, "update privilege set id%d = 0", i);
            cout << sql << endl;
            if (mysql_real_query1(sql))
            {
                return -1;
            }
        }
    }
    return 0;
}
int Mysql::select_privilege(char *str)
{
    char sql[MAX_SQL_LEN];
    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"select * from privilege where name = 'system'");

    if (mysql_real_query1(sql))
    {
        return -1;
    }
    result = mysql_store_result(conn);
    row = mysql_fetch_row(result);
    if (row == NULL)
    {
        return -1;
    }
    unsigned int num = mysql_field_count(conn);
    for (unsigned int i = 0; i < num-1; i++)
    {
        strcat(str, row[i]);
    }
    return 0;
}

int Mysql::mysql_real_query1(char *sql)
{
    if (mysql_query(conn,sql)){
        fprintf(stderr,"%s\n\n",mysql_error(conn));
        fprintf(stderr,"%s\n",sql);

        return  (-1);
    }

    return (0);
}
int Mysql::add_role(char *role,char *role_info)
{
    char sql[MAX_SQL_LEN];

    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"insert into privilege(id1,id2,id3,id4,id5,id6,id7,id8,id9,id10,name) values('%c','%c','%c','%c','%c','%c','%c','%c','%c','%c','%s')",role_info[0],role_info[1],role_info[2],role_info[3],role_info[4],role_info[5],role_info[6],role_info[7],role_info[8],role_info[9], role);

    return mysql_real_query1(sql);  
}
int Mysql::delete_role(char *role)
{
    char sql[MAX_SQL_LEN];

    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"delete from privilege where name= '%s'",role);

    return mysql_real_query1(sql);
}
int Mysql::update_role(char *role,char *role_info)
{
    char sql[MAX_SQL_LEN];  
    bzero(sql,MAX_SQL_LEN);

    sprintf(sql,"update privilege set id1 = '%c',id2 = '%c',id3 = '%c',id4 = '%c',id5 = '%c',id6 = '%c',id7 ='%c',id8 = '%c',id9 = '%c',id10 = '%c' where name = '%s'",role_info[0],role_info[1],role_info[2],role_info[3],role_info[4],role_info[5],role_info[6],role_info[7],role_info[8],role_info[9], role);

    return mysql_real_query1(sql);
}
int Mysql::select_role(char *role,char *role_info)
{
    char sql[MAX_SQL_LEN];

    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"select * from privilege where name = '%s'",role);

    return select_role_store(sql,role_info);
}
int Mysql::select_role_store(char *sql,char *role_info)
{   
    if ( -1 == mysql_real_query1(sql))
    {
        return (-1);
    }
    //process result  
    result = mysql_store_result(conn);  
    if (result == NULL)
    {  
        if (mysql_error(conn))  
            fprintf(stderr, "%s\n", mysql_error(conn));  
        fprintf(stderr, "%s\n", "unknown error\n");  
        return -1;  
    }  
    if (row = mysql_fetch_row(result))
    {
        if (NULL == role_info)
        {
            return (0);
        }else {
            sprintf(role_info,"%s%s%s%s%s%s%s%s%s%s%s:%s",row[0],row[1],row[2],row[3],row[4],row[5],row[6],row[7],row[8],row[9],row[10]);
            return 0;
        }
    }
    else
        return -2;
    return (0);
}   
int Mysql::select_roles_name(char **p)
{
    char sql[MAX_SQL_LEN];

    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"select name from privilege");
    int ret = mysql_real_query1(sql);
    if (ret != 0)
        return -1;

    result = mysql_store_result(conn);
    unsigned int num = mysql_field_count(conn);
    unsigned int count = mysql_num_rows(result);
    cout << "roles name count:" << count << endl;
    char *buffer = new char[count * 8];
    bzero(buffer, count * 8);
    while (row = mysql_fetch_row(result))
    {
        for (unsigned int i = 0; i < num; i++)
        {
            strcat(buffer, row[i]);
            strcat(buffer, ":");
        }
    }
    *p = buffer;

    return 0;
}

int Mysql::selectUserPrivilege(const char *name, char *body)
{
    char sql[MAX_SQL_LEN];

    bzero(sql,MAX_SQL_LEN);
    sprintf(sql,"select privilege.id1, privilege.id2, privilege.id3, privilege.id4, privilege.id5, privilege.id6, privilege.id7, privilege.id8, privilege.id9, privilege.id10, usrs.name from usrs, privilege where usrs.name = '%s' and usrs.privilege = privilege.name", name);

    cout << sql << endl;
    int ret = mysql_real_query1(sql);
    if (ret != 0)
        return -1;
    result = mysql_store_result(conn);
    if (row = mysql_fetch_row(result))
    {
        for (int i = 0; i < 11; i++)
        {
            strcat(body, row[i]);
        }
        cout << body << endl;
        return 0;
    }
    else
        return -2;
}