代码实现:

#include <head.h>

int add_msg(sqlite3* ppdb)
{
	int id;
	char name[20];
	int age;
	double salary;

	//输入要插入的工人信息
	printf("请输入工号:");
	scanf("%d",&id);
	printf("请输入姓名:");
	scanf("%s",name);
	printf("请输入年龄:");
	scanf("%d",&age);
	printf("请输入工资:");
	scanf("%lf",&salary);
	getchar();

	//准备sql语句
	char sql[128]="insert into Worker values(id,name,age,salary)";
	//将格式串转换为字符串
	sprintf(sql,"insert into Worker values(%d,'%s',%d,%.2lf);",id,name,age,salary);
	printf("sql=%s\n",sql);
	
	//定义储存错误信息的指针
	char* errmsg=NULL;
	//调用执行sql语句的函数
	sqlite3_exec(ppdb,sql,NULL,NULL,&errmsg);
	//释放
	sqlite3_free(errmsg);

	printf("insert success\n");
	
	return 0;
}

int delete_msg(sqlite3* ppdb)
{
	int id;
	printf("请输入要删除的信息id号:");
	scanf("%d",&id);
	getchar();

	//准备sql语句
	char sql[128]="";
	sprintf(sql,"delete from Worker where id=%d;",id);
	printf("sql=%s\n",sql);

	//定义储存错误信息的指针
	char* errmsg=NULL;
	//调用执行sql语句的函数
	sqlite3_exec(ppdb,sql,NULL,NULL,&errmsg);
	//释放
	sqlite3_free(errmsg);
	
	printf("delete success\n");

	return 0;
}

int update_msg(sqlite3* ppdb)
{
	int old_id;
	int new_id;
	char name[128]="";
	int age;
	double salary;
	printf("请输入要修改的信息id号:");
	scanf("%d",&old_id);
	printf("请输入修改的id号:");
	scanf("%d",&new_id);
	printf("请输入要修改的姓名:");
	scanf("%s",name);
	printf("请输入要修改的年龄:");
	scanf("%d",&age);
	printf("请输入要修改的薪资:");
	scanf("%lf",&salary);
	getchar();

	//准备sql语句
	char sql[128]="";
	sprintf(sql,"update Worker set id=%d,name='%s',age=%d,salary=%.2lf where id=%d;",new_id,name,age,salary,old_id);
	printf("sql=%s\n",sql);

	//定义储存错误信息的指针
	char* errmsg=NULL;
	//调用执行sql语句的函数
	sqlite3_exec(ppdb,sql,NULL,NULL,&errmsg);
	//释放
	sqlite3_free(errmsg);

	printf("update success\n");
	
	return 0;
}

//定义回调函数
int callback(void* arg,int cols,char** col_text,char** col_name)
{
	//打印表头
	if(*((int*)arg)==0)
	{
		(*((int*)arg))++;  //标识位自增
		for(int i=0;i<cols;i++)
		{
			printf("%5s\t",*(col_name+i));
		}
		putchar(10);
	}

	//打印数据
	for(int i=0;i<cols;i++)
	{
		printf("%5s\t",*(col_text+i));
	}
	putchar(10);

	return 0;
}

int search_msg(sqlite3* ppdb)
{
	//准备sql语句
	char sql[]="select * from Worker;";
	char* errmsg=NULL;

	int arg=0;  //标识位

	sqlite3_exec(ppdb,sql,callback,&arg,&errmsg);
	sqlite3_free(errmsg);
	
	printf("查找成功\n");
	return 0;
}

int main(int argc, const char *argv[])
{
	//1.打开数据库
	//定义句柄指针
	sqlite3* ppdb=NULL;
	if(sqlite3_open("my.db",&ppdb)!=SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open error,errcode:%d,errmsg:%s\n",sqlite3_errcode(ppdb),sqlite3_errmsg(ppdb));
		return -1;
	}
	printf("sqlite3_open success\n");

	//2.执行sql语句
	//2.1准备sql语句
	char sql[128]="create table if not exists Worker(id int primery key,name char,age int,salary double);";

	//2.2定义接收错误信息的指针
	char* errmsg=NULL;	
	
	if(sqlite3_exec(ppdb,sql,NULL,NULL,&errmsg)!=SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec error:%s\n",errmsg);
		//释放errmsg的内存
		sqlite3_free(errmsg);
		return -1;
	}
	printf("create table success\n");

	//增删改查操作
	int menu;
	while(1)
	{
		system("clear");
		printf("=====员工信息管理=====\n");
		printf("=====1> 增加记录 =====\n");
		printf("=====2> 删除记录 =====\n");
		printf("=====3> 修改记录 =====\n");
		printf("=====4> 查找记录 =====\n");
		printf("=====0> 退出     =====\n");
		printf("请输入选项:");
		scanf("%d",&menu);
		getchar();  //吸收scanf留下的回车

		switch(menu)
		{
		case 1:
			{
				//增加记录
				add_msg(ppdb);
			}
			break;
		case 2:
			{
				//删除记录
				delete_msg(ppdb);
			}
			break;
		case 3:
			{
				//修改记录
				update_msg(ppdb);
			}
			break;
		case 4:
			{
				//查找记录
				search_msg(ppdb);
			}
			break;
		case 0: goto END;  //退出数据库操作
		default:printf("输入功能有误，请重新输入!\n");
		}
		//阻塞等待用户输入回车
		printf("输入任意字符结束>>>");
		while(getchar() != 10);
	}

END:

	//3.关闭数据库
	sqlite3_close(ppdb);
	
	return 0;
}

效果：