Linux下的C语言编程——sqlite3的基本操作

在C语言中实现sqlite3的基本操作#include <stdio.h>
#include <stdlib.h>
#include <sqlite3.h>

int delete(sqlite3 *db)
{

char *errmsg;
char sql[100];
int id;

printf("input a id you want to delete!\n");
scanf("%d",&id);

sprintf(sql,"delete from mytable where id = %d;",id);

if(SQLITE_OK != sqlite3_exec(db,sql,NULL,NULL,&errmsg))
{
printf("fail:%s\n",errmsg);
printf("\n");
exit(-1);
}
}

int display(void *para,int col_count,char **col_value,char **col_name)
{
int i;

printf("total column is %d\n",col_count);

for(i = 0; i < col_count; i++)
{
printf("%s: %s: \n",col_name[i],col_value[i]);
}

printf("********************\n");

return 0;
}

int display_usecb(sqlite3 *db)
{

char *errmsg;
char *sql;

sql = "select * from mytable;";

if(SQLITE_OK != sqlite3_exec(db,sql,display,NULL,&errmsg))
{
printf("fail:%s\n",errmsg);
printf("\n");
exit(-1);
}
}

int insert_record(sqlite3 *db)
{

char *errmsg;
char sql[100];

int id;
char name[10];

printf("input a id you want to insert!\n");
scanf("%d",&id);

printf("input a name you want to insert!\n");
scanf("%s",name);

sprintf(sql,"insert into mytable (id,name) values (%d,'%s');",id,name);

if(SQLITE_OK != sqlite3_exec(db,sql,NULL,NULL,&errmsg))
{
printf("fail:%s\n",errmsg);
printf("\n");
exit(-1);
}

/* sql = "insert into mytable (id,name) values (NULL,'qi');";

if(SQLITE_OK != sqlite3_exec(db,sql,NULL,NULL,&errmsg))
{
printf("fail:%s\n",errmsg);
printf("\n");
}

sql = "insert into mytable (id,name) values (NULL,'fei');";

if(SQLITE_OK != sqlite3_exec(db,sql,NULL,NULL,&errmsg))
{
printf("fail:%s\n",errmsg);
printf("\n");
}*/
}

int creat_table(sqlite3 *db)
{
char *errmsg;
char *sql;

sql = "create table if not exists mytable (id integer primary key,name text);";

if(SQLITE_OK != sqlite3_exec(db,sql,NULL,NULL,&errmsg))
{
printf("fail:%s\n",errmsg);
printf("\n");
exit(-1);
}
}

int display_nocb(sqlite3 *db)
{
int nrow;
int ncolumn;
int i;
char *errmsg;
char **aresult;
char *sql;

sql = "select * from mytable;";

if(SQLITE_OK != sqlite3_get_table(db,sql,&aresult,&nrow,&ncolumn,&errmsg))
{
printf("file : %s\n",errmsg);
printf("\n");
exit(-1);
}

printf("row : %d column : %d\n",nrow,ncolumn);

for(i = 0; i < (nrow + 1) * ncolumn; i++)
{
printf("%10s",aresult[i]);

if((i + 1) % ncolumn == 0)
{
printf("\n");
}
}

sqlite3_free_table(aresult);

}

int main()
{
int ret;
sqlite3 *db;

ret = sqlite3_open("test.db",&db);

if(ret != SQLITE_OK)
{
perror("sqlite open:");
exit(-1);
}

creat_table(db);
insert_record(db);
display_usecb(db);
delete(db);
//display_usecb(db);
display_nocb(db);
return 0;
}