SQLite最新的版本是3.0，使用之前应该先导入libsqlite3.0.dylib
1.导入流程
2.iOS中操作数据库的流程
打开数据库
准备SQL数据库
执行SQL数据库
语句完结
关闭数据库
3.SQLite()使用的是C的函数接口
4.创建数据库
-(void)createSQL{
NSFileManager *manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:kDataBaseFilePath]) {
NSLog(@"数据库不存在");
return;
}
NSLog(@"%@",kDataBaseFilePath);
[manager createFileAtPath:kDataBaseFilePath contents:nil attributes:nil];
sqlite3 *sql =NULL;
int openDbResult = sqlite3_open([kDataBaseFilePath UTF8String], &sql);
if (openDbResult==SQLITE_OK) {
NSLog(@"数据库打开成功");
}
else{
NSLog(@"打开不成功");
[manager removeItemAtPath:kDataBaseFilePath error:nil];
return;
}
NSString *sqlString = @"CREATE TABLE user(id integer PRIMARY KEY AUTOINCREMENT, username text NOT NULL UNIQUE, password text NOT NULL);";
char *errmsg = NULL;
int exeResult = sqlite3_exec(sql, [sqlString UTF8String], NULL, NULL, &errmsg);
if (exeResult == SQLITE_OK) {
NSLog(@"表格成功被创建");
}
else{
NSLog(@"失败");
sqlite3_close(sql);
[manager removeItemAtPath:kDataBaseFilePath error:nil];
return;
}
sqlite3_close(sql);
}
5.数据库的插入数据库
-(void)createSQL{
NSFileManager *manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:kDataBaseFilePath]) {
NSLog(@"数据库不存在");
return;
}
NSLog(@"%@",kDataBaseFilePath);
[manager createFileAtPath:kDataBaseFilePath contents:nil attributes:nil];
sqlite3 *sql =NULL;
int openDbResult = sqlite3_open([kDataBaseFilePath UTF8String], &sql);
if (openDbResult==SQLITE_OK) {
NSLog(@"数据库打开成功");
}
else{
NSLog(@"打开不成功");
[manager removeItemAtPath:kDataBaseFilePath error:nil];
return;
}
NSString *sqlString = @"CREATE TABLE user(id integer PRIMARY KEY AUTOINCREMENT, username text NOT NULL UNIQUE, password text NOT NULL);";
char *errmsg = NULL;
int exeResult = sqlite3_exec(sql, [sqlString UTF8String], NULL, NULL, &errmsg);
if (exeResult == SQLITE_OK) {
NSLog(@"表格成功被创建");
}
else{
NSLog(@"失败");
sqlite3_close(sql);
[manager removeItemAtPath:kDataBaseFilePath error:nil];
return;
}
sqlite3_close(sql);
}