网络编程(3/6)

使用C语言完成数据库的增删改

#include<myhead.h>
int do_add(sqlite3 *ppDb)
{int numb;char name[50];int salary;printf("请输入员工信息：工号、姓名、薪水\n");scanf("%d %s %d",&numb,name,&salary);char sql[128];char *errmsg=NULL;sprintf(sql,"INSERT INTO Worker values(%d,'%s',%d)",numb,name,salary);if(sqlite3_exec(ppDb,sql,NULL,NULL,&errmsg)!=SQLITE_OK){printf("exec error : %s\n", errmsg);sqlite3_free(errmsg);             	errmsg = NULL;return -1;}printf("员工信息加入成功\n");return 0;
}
int do_delete(sqlite3 *ppDb)
{char buf[128];printf("请输入要删除的员工工号：");fgets(buf,sizeof(buf),stdin);char sql[128]="DELETE form Worker where numb=";strcat(sql,buf);char *errmsg=NULL;if(sqlite3_exec(ppDb,sql,NULL,NULL,&errmsg)!=SQLITE_OK){printf("exec error : %s\n", errmsg);sqlite3_free(errmsg);             	errmsg = NULL;return -1;}printf("删除成功\n");return 0;
}
int do_update(sqlite3 *ppDb)
{int salary,numb;printf("请输入要更改薪资的员工的员工号：");scanf("%d",&numb);printf("请输入所要更改后的薪水：");scanf("%d",&salary);char sql[128];sprintf(sql,"update Worker set salary=%d where numb=%d",salary,numb);char *errmsg=NULL;if(sqlite3_exec(ppDb,sql,NULL,NULL,&errmsg)!=SQLITE_OK){printf("exec error : %s\n", errmsg);sqlite3_free(errmsg);             	errmsg = NULL;return -1;}printf("更新成功\n");return 0;}
int main(int argc, const char *argv[])
{//定义数据库句柄指针sqlite3 * ppDb = NULL;//打开数据库，如果数据库不存在，则创建数据库//将数据库句柄由参数2返回if(sqlite3_open("./my.db", &ppDb) != SQLITE_OK){printf("sqlite3_open error,errcode=%d, errmsg = %s\n",\sqlite3_errcode(ppDb), sqlite3_errmsg(ppDb));return -1;}printf("sqlite3_open success\n");//创建数据表//1、准备sql语句char sql[128] = "create table if not exists Worker(numb int, name char, salary double)";char *errmsg = NULL;       //存放执行sql语句口的错误信息if(sqlite3_exec(ppDb, sql, NULL, NULL, &errmsg) != SQLITE_OK){printf("exec error : %s\n", errmsg);sqlite3_free(errmsg);             //防止内存泄露errmsg = NULL;return -1;}printf("员工信息表创建成功\n");int menu = -1;         //菜单选项for(;;){system("clear");             //清空之前的终端信息printf("\t\t=======XXX公司员工管理系统=======\n");printf("\t\t======1、添加员工信息=========\n");printf("\t\t======2、删除员工信息=========\n");printf("\t\t======3、修改员工信息=========\n");printf("\t\t======4、查询员工信息=========\n");printf("\t\t======0、退出=========\n");printf("请输入操作码:");          //提示并输入信息scanf("%d", &menu);getchar();                          //吸收回车switch(menu){case 1:{do_add(ppDb);}break;case 2:{do_delete(ppDb);}break;case 3:{do_update(ppDb);}break;case 4:{//do_search(ppDb);}break;case 0:goto END;default:printf("您输入的功能有误，请重新输入！！！\n");}printf("请输入任意键，按回车清屏\n");while(getchar() != '\n');}END://关闭数据库sqlite3_close(ppDb);return 0;
}