使用数据库实现增删改查

 

#include<myhead.h>//定义添加数据函数int do_add(sqlite3 *ppDb)
{//1.准备sql语句,输入要添加的信息int add_numb;          //工号char  add_name[20];    //姓名char  add_sex[10];     //性别double add_score;      //工资printf("请输入要添加的工号:");scanf("%d",&add_numb);printf("请输入要添加的姓名:");scanf("%s",add_name);printf("请输入要添加的性别:");scanf("%s", add_sex);printf("请输入要添加的工资:");scanf("%lf", &add_score);getchar();//准备sql语句char sql[128]="";sprintf(sql,"insert into Worker(numb, name, sex, score) value(%d,\"%s\",\"%s\",%2lf);",add_numb,add_name,add_sex,add_score);//2.定义错误信息存放指针char *errmsg = NULL;//3.执行语句if(sqlite3_exec(ppDb, sql, NULL,NULL,NULL, &errmsg) != SQLITE_OK){printf("exec error:%s\n",errmsg);sqlite3_free(errmsg);errmsg = NULL;return -1;}printf("do_add success\n");return 0;
}//删除员工信息
int do_delete(sqlite3 *ppDb)
{//1.准备sql语句 输入要删除员工信息int delete_numb;printf("请输入要删除记录的工号:");scanf("%d",&delete_numb);getchar();char sql[128]="";sprintff(sql,"delete from Stu where numb=%d",delete_numb);//2.定义错误信息存放指针char *errmsg = NULL;//3.执行语句if(sqlite3_exec(ppDb, sql, NULL,NULL,NULL, &errmsg) != SQLITE_OK){printf("exec error:%s\n",errmsg);sqlite3_free(errmsg);errmsg = NULL;return -1;}printf("do_delete success\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 *sql = "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;
}