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app.c
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app.c
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#include <stdio.h>
#include <stdlib.h>
#include <sqlite3.h>
#include <string.h>
int ret = 0, empty = 1, id, age;
char *sql = NULL, *err = 0;
char name[20] = { 0 };
char gender[7] = { 0 };
sqlite3 *db;
void empty_cache()
{
char ch;
ch = getchar();
while (ch != EOF && ch != '\n') {
ch = getchar();
}
}
int rscallback(void *p, int argc, char **argv, char **argvv)
{
int i;
*(int *) p = 0;
for (i = 0; i < argc; i++) {
printf("%s = %s ", argvv[i], argv[i] ? argv[i] : "NULL");
}
printf("\n");
return 0;
}
int main(int argc, const char *argv[])
{
ret = sqlite3_open("./test.db", &db);
if (ret != SQLITE_OK) {
fputs(sqlite3_errmsg(db), stderr);
fputs("\n", stderr);
exit(1);
}
//sql =
// sqlite3_mprintf
// ("create table student(id integer primary key,name text,gender text,age integer);");
//ret = sqlite3_exec(db, sql, 0, 0, &err);
while (1) {
printf("1.Display all records\n");
printf("2.Insert Record\n");
printf("3.Delete Record\n");
printf("4.Exit\n");
printf("Please Select[1-4]:");
int i;
scanf("%d", &i);
switch (i) {
case 1:
xianshi();
empty_cache();
break;
case 2:
charu();
empty_cache();
break;
case 3:
shanchu();
empty_cache();
break;
case 4:
exit(0);
break;
default:
empty_cache();
break;
}
}
if (ret != SQLITE_OK) {
fputs(err, stderr);
fputs("\n", stderr);
sqlite3_close(db);
exit(1);
}
sqlite3_close(db);
return 0;
}
xianshi()
{
sql = sqlite3_mprintf("select * from student;");
ret = sqlite3_exec(db, sql, rscallback, &empty, &err);
sqlite3_free(sql);
if (empty) {
fputs("table student is empty\n", stderr);
sql =
sqlite3_mprintf
("create table student(id integer primary key,name text,gender text,age integer);");
ret = sqlite3_exec(db, sql, 0, 0, &err);
exit(1);
}
}
charu()
{
start:printf("Please input id name gender age:");
empty_cache();
scanf("%d %20s %s %d", &id, name, gender, &age);
if ((id > 0 && id < 1000) && (age > 0 && age < 100) && ((strcmp(gender, "female") == 0
|| strcmp(gender, "male") == 0))) {
sql =
sqlite3_mprintf
("insert into student values(%d,%Q,%Q,%d);", id, name,
gender, age);
ret = sqlite3_exec(db, sql, 0, 0, &err);
sqlite3_free(sql);
} else {
// empty_cache();
goto start;
}
}
shanchu()
{
printf("1.Delete by id\n");
printf("2.Delete by name\n");
printf("Your choice:");
empty_cache();
int a;
scanf("%d", &a);
switch (a) {
case 1:
printf("Please input the id:");
scanf("%d", &id);
sql =
sqlite3_mprintf("delete from student where id = %d;",
id);
ret = sqlite3_exec(db, sql, 0, 0, &err);
sqlite3_free(sql);
break;
case 2:
printf("Please input the name:");
scanf("%s", name);
sql =
sqlite3_mprintf
("delete from student where name = %Q;", name);
ret = sqlite3_exec(db, sql, 0, 0, &err);
sqlite3_free(sql);
break;
default:
exit(0);
}
}