MySQL入门之动态SQL工具实现

2017-01-13 19:11:06来源:CSDN作者:lzjsqn人点击

集体看代码,而且在应用程序里面解决了backup回显的问题

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <dlfcn.h>#include <mysql/mysql.h>#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <errno.h>#include <termios.h>#include <mysql/mysql.h>#include <termios.h>struct termios oldterm;void setstty2()//设置输入退格键,不回显{    //system("stty erase ^H");//执行shell命令,也可以 用来设置读取用户键盘输入的时候,退格键不回显    struct termios term;    if(tcgetattr(STDIN_FILENO, &term) == -1)//得到系统termion的设置    {        printf("tcgetattr error is %s/n", strerror(errno));        return;    }    oldterm = term;//保留当前termios设置,以便程序退出的时候可以恢复termios    /*    term.c_lflag &= ~ICANON;//取消ICANON选项(不规范输入)    term.c_lflag |= ICANON;//设置ICANON选项(规范输入)    term.c_cc字段为要设置的具体特殊输入字符,如c_cc[VERASE]代表退格键,    term.c_cc[VERASE] = '/b';意思为把退格键修改为'/b'    VERASE代表向前擦出一个字符,VINTR代表发送ctrl + C中断信号,ctrl + c的ASCII码为3    例如:term.c_cc[VINTR] = '/t';意思为将tab键设置为终端信号    tcsetattr中,第二个参数说明,TCSAFLUSH:发送了所有输出后更改才生效,在更改发生时,未读取的所有输入数据都被删除    TCSANOW:更改立即生效    TCSADRAIN:发送了所有输出后更改才发生,如果更改输出参数则应该使用该选项    */    term.c_cc[VERASE] = '/b';//'/b'为退格键的ASCII码    if (tcsetattr(STDIN_FILENO, TCSANOW, &term) == -1)//设置系统termion    {        printf("tcsetattr error is %s/n", strerror(errno));    }    return;}void setstty()//设置输入退格键,不回显{    system("stty erase ^H");//执行shell命令,也可以 用来设置读取用户键盘输入的时候,退格键不回显}void returnstty()//恢复系统的termios设置{    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &oldterm) == -1)//设置系统termion    {        printf("tcsetattr error is %s/n", strerror(errno));    }    return;}int main(int arg, char *args[]){    int             ret = 0, i=0;    MYSQL           mysql;    MYSQL           *connect;    MYSQL_RES       *result;    MYSQL_ROW       row;    MYSQL_FIELD     *fields;    unsigned int    num_fields;    if (arg < 4)    {        printf("please enter: %s localhost user password dbname/n", args[0]);        return -1;    }    setstty();//设置输入退格键,不回显    mysql_init(&mysql);    //连接到mysql server    connect = mysql_real_connect(&mysql, args[1], args[2], args[3], args[4],0, 0, 0);    if (connect == NULL)    {        printf("connect error, %s/n", mysql_error(&mysql));        return -1;    }    ret = mysql_query(connect, "SET NAMES utf8");       //设置字符集为UTF8    if (ret != 0)    {        printf("设置字符集错误, %s/n", mysql_error(&mysql));        return ret;    }    char buf[4096];    for( ; ; )      {          memset(buf, 0, sizeof(buf));        //strcpy(buf, "mysql>");        //write(STDOUT_FILENO, buf, strlen(buf));        //memset(buf, 0, sizeof(buf));        //read(STDIN_FILENO, buf, sizeof(buf));        printf("/nmysql>");        gets(buf);          /* EXIT(exit):退出 */          if ( 0 == strncmp(buf , "exit" , 4) || 0 == strncmp(buf , "EXIT" , 4) ||             0 == strncmp(buf , "quit" , 4) || 0 == strncmp(buf , "QUIT" , 4) )         {            break;        }            //printf("buf:%s /n", buf);         ret = mysql_query(connect, buf);          if (ret != 0 )         {            printf("func mysql_query() err: %s", mysql_error(&mysql) );            continue;         }         else         {            //printf("ok/n");         }         if ( (strncmp(buf, "select", 6) == 0) || (strncmp(buf, "SELECT", 6) == 0) ||              (strncmp(buf, "show", 4) == 0) || (strncmp(buf, "SHOW", 4) == 0) ||              (strncmp(buf, "desc", 4) == 0) || (strncmp(buf, "DESC", 4) == 0) )         {                //获取查询结果                result = mysql_store_result(&mysql);                 //获取列表头信息信息                fields = mysql_fetch_fields(result);                num_fields = mysql_num_fields(result);                for (i=0; i<num_fields; i++)                {                   printf("%s/t", fields[i].name);                }                printf("/n");                //按照行获取数据 检索结果集的下一行。                while(row = mysql_fetch_row(result))                {                    for (i=0; i<mysql_num_fields(result); i++)                    {                        printf("%s/t ",row[i]);                    }                    printf("/n");                }                mysql_free_result(result);     //free result after you get the result         }         else         {            //printf("")mysql_affected_rows(connect);          }    }        mysql_close(connect);      //断开与SQL server的连接    // returnstty();//恢复系统的termios设置    return 0;}

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