1 1:使用sqlite3_exec函数读取数据库的数据,将这些数据存入链表遍历该链表，输出“字段”=“数据”2:使用sqlite3_get_table读取数据库的数据写一个“字段" ="数据”输出的循环
1

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <wait.h>
#include <signal.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <semaphore.h>
#include <sys/msg.h>
#include <sys/shm.h>
#include <sys/un.h>
#include <sqlite3.h>typedef struct sockaddr_in addr_in_t;
typedef struct sockaddr addr_t;
typedef struct sockaddr_un addr_un_t;typedef struct sqlite_data{char id[20];char name[20];char sorce[20];
}sqlite_t;
typedef struct STU{union {sqlite_t  date;struct STU *tail;};struct STU *next;                                                                               
}stu_t;
int callback(void* arg , int argc , char **argv , char **col){stu_t * head  =(stu_t*)arg;stu_t * t = calloc(1, sizeof(stu_t));head->tail->next = t;strcpy(t->date.id,argv[0]);strcpy(t->date.name,argv[1]);strcpy(t->date.sorce,argv[2]);head->tail = t;t->next = NULL;//free(t);return 0;
}int main(int argc, const char *argv[])
{sqlite3 *db = NULL;if(sqlite3_open("./student.db" , &db)!= SQLITE_OK){printf("数据库打开失败\n");return -1;}char * errmsg = NULL;stu_t *stu = calloc(1, sizeof(stu_t));stu->next =NULL;stu->tail = stu;const char *sql = "SELECT * FROM stu";if(sqlite3_exec(db , sql , callback , stu  , &errmsg)!= SQLITE_OK){printf("errmsg:%s\n" , errmsg);return -1;}sqlite3_close(db);stu_t * p  = stu->next;while(p!=NULL){printf("id = %s\n",p->date.id);printf("neme = %s\n",p->date.name);printf("sorce =%s\n ",p->date.sorce);//这个 出结果了；p=p->next;printf("-----------------------\n");}return 0;
}

2.

ubuntu@ubuntu:~/11/dataaa$ vim stu.c
ubuntu@ubuntu:~/11/dataaa$ cat stu.c
#include <stdio.h> 
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <wait.h>
#include <signal.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <semaphore.h>
#include <sys/msg.h>
#include <sys/shm.h>
#include <sys/un.h>
#include <sqlite3.h>
typedef struct sockaddr_in addr_in_t;
typedef struct sockaddr addr_t;
typedef struct sockaddr_un addr_un_t;int main(int argc, const char *argv[])
{sqlite3  *db = NULL;if(sqlite3_open("./student.db" , &db)!= SQLITE_OK){printf("数据库打开失败\n");return -1;}char *errmsg = NULL;const char * sql = "SELECT * FROM stu";char **buf = NULL;int  recordno = 0;int colno = 0;if(sqlite3_get_table(db ,sql, &buf ,&recordno , &colno ,&errmsg)!= SQLITE_OK){printf(" errmsg:%s\n" , errmsg);return -1;}sqlite3_close(db);for(int i = 0  ; i < recordno ; i++){for(int j = 0 ; j<   colno ; j++){printf("\t%s" , *(buf+j+i*colno));}printf("\n");}return 0;}