1.思维导图

2.数据库操作的增、删、改完成。

#include<myhead.h>
//定义新增员工信息函数
int do_add(sqlite3 *ppDb)
{
	int numb;
	char name;
	double salary;
	printf("请输入要插入的信息：");
	scanf("%d%s%d\n",&numb,name,&salary);
	char sql[128]="";
	sprintf(sql,"INSERT INTO Worker VALUES(%d,%s,%d)",numb,name,salary);
	//char sql[128]="insert into Worker values(001,'张三',10000)";
	//char sql2[128]="insert into Worker values(002,'李四',9000)";
	//char sql3[128]="insert into Worker values(003,'王五',12000)";
	//char sql4[128]="insert into Worker values(004,'赵六',20000)";
	//char sql[128]="alter table Worker add column numb int";
	char *errmsg=NULL;    //存放执行sql语句的错误信息
	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("add success\n");
}
//定义删除员工信息函数
int do_delete(sqlite3 *ppDb)
{
	char sql[128]="DELETE FROM Worker WHERE numb=001";
	char *errmsg=NULL;    //存放执行sql语句的错误信息
	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("delete success\n");
}

//定义修改员工信息函数
int do_update(sqlite3 *ppDb)
{
	char sql[128]="UPDATE Worker SET salary>10000 WHERE numb=002"; 
	char *errmsg=NULL;    //存放执行sql语句的错误信息
	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("update success\n");
}

//定义查找员工信息函数
int do_search(sqlite3 *ppDb)
{
	char sql[128]="SELECT *FROM Worker WHERE numb=003";
	char *errmsg=NULL;    //存放执行sql语句的错误信息
	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("search success\n");
}



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;
}