iPhone开发之Ssqlite3数据库操作是本文要介绍的内容,下面是对sqlite3数据库的操作,首先是要倒入类,最基本的,但不要忘记。我对数据库的操作进行了单独的处理,自己看着比较舒服,也好明白,需要用到时,直接调用久好了,也可以有代理,一直没研究,日后好好看看,先总结这些,方便自己查看,忘记时找找,老不用会很快忘记,方便自己吧!
- #import
- #define kFilename @"data.sqlite3"
1、打开数据库操作
- -(void)openDB {
- NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
- NSString *documentsDirectory = [paths objectAtIndex:0];
- NSString *dataFilePath = [documentsDirectory stringByAppendingPathComponent:kFilename];
- if (sqlite3_open([dataFilePath UTF8String], &database) != SQLITE_OK) {
- sqlite3_close(database);
- }
2、创建表,结构,类型
- - (void)initDB {
- char *errorMsg;
- NSString *sql = @"CREATE TABLE IF NOT EXISTS USER (USER_ID INTEGER PRIMARY KEY,USERNAME TEXT,PASSWORD TEXT);";
- if (sqlite3_exec(database, [sql UTF8String], NULL, NULL, &errorMsg) != SQLITE_OK) {
- sqlite3_close(database);
- }
- }
3、执行添加方法
- - (void)insertUsername:(NSString *)username insertPassword:(NSString *)password {
- [self openDB];//调用打开库
- [self initDB];//调用创建表
- char *errorMsg;
- char *update = "INSERT OR REPLACE INTO USER (USERNAME,PASSWORD) VALUES (?,?);";//添加语句
- NSString *sql = [NSString stringWithFormat:@"SELECT USERNAME,PASSWORD FROM USER"];//查询语句
- sql = @"DELETE FROM USER;";//删除语句
- sqlite3_stmt *statement;
- if (sqlite3_prepare_v2(database, update, -1, &statement, nil) == SQLITE_OK) {
- sqlite3_bind_text(statement, 1, [username UTF8String], -1, SQLITE_TRANSIENT);
- sqlite3_bind_text(statement, 2, [password UTF8String], -1, SQLITE_TRANSIENT);
- }
- if (sqlite3_step(statement) != SQLITE_DONE)
- NSAssert1(0,@"Error updating table:%s",errorMsg);
- sqlite3_finalize(statement);
- sqlite3_close(database);
小结:iPhone开发之Ssqlite3数据库操作的内容介绍完了,希望本文对你有所帮助。