sqlite运用总结
1、打开数据库。//打开数据库-(BOOL)openDatabase{NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);NSString *paths = [ stringByAppendingPathComponent:@"NineCellDiaryDB.sqlite3"];if(sqlite3_open(, &database) != SQLITE_OK){;return NO;}return YES;}
2、关闭数据库。
//关闭数据库-(BOOL)closeDatabase{return (sqlite3_close(database) == SQLITE_OK)?YES:NO;}
3、插入数据。
//打开数据库if(!){;return NO;}sqlite3_stmt *insert_statement;//准备sql语句const char* sql = "insert into userinfo(uname,upassword,uexp,uportrait) values(?,?,?,?)";//绑定语句值if (sqlite3_prepare_v2(database,sql, -1, &insert_statement, NULL) != SQLITE_OK)return NO;sqlite3_bind_text(insert_statement, 1, , -1, SQLITE_TRANSIENT);sqlite3_bind_text(insert_statement, 2, , -1, SQLITE_TRANSIENT);sqlite3_bind_int(insert_statement, 3, );//提供png格式和jpg格式支持int returnValue = -1;NSData *imageData = nil; UIImage *por = ;imageData = UIImagePNGRepresentation(por);//png格式if (nil == por) {returnValue = sqlite3_bind_blob(insert_statement, 4, nil, -1, NULL);}else {returnValue = sqlite3_bind_blob(insert_statement, 4,,, NULL);}//执行插入if (sqlite3_step(insert_statement) != SQLITE_DONE) {sqlite3_finalize(insert_statement);;return NO;}sqlite3_finalize(insert_statement);;
4、更新数据。
//打开数据库if(!){;return NO;}//准备陈述命令sqlite3_stmt *update_statement;//准备sql语句const char* sql = "update userinfo set uname=?,upassword=?,uexp=?,uportrait=? where id=1";//绑定语句值if (sqlite3_prepare_v2(database,sql, -1, &update_statement, NULL) != SQLITE_OK)return NO;sqlite3_bind_text(update_statement, 1, , -1, SQLITE_TRANSIENT);sqlite3_bind_text(update_statement, 2, , -1, SQLITE_TRANSIENT);sqlite3_bind_int(update_statement, 3, );//提供png格式和jpg格式支持int returnValue = -1;NSData *imageData = nil;UIImage *por = ;if (nil == por) {returnValue = sqlite3_bind_blob(update_statement, 4, nil, -1, NULL); }else {imageData = UIImageJPEGRepresentation(por,1.0f);//jpg格式returnValue = sqlite3_bind_blob(update_statement, 4,,, NULL);}}//执行if (sqlite3_step(update_statement) != SQLITE_OK){sqlite3_finalize(update_statement);;return NO;}sqlite3_finalize(update_statement);;
5、查询数据
//打开数据库if (!) {return self;}//查询所有数据sqlite3_stmt *statement;const char* zTail;sqlite3_prepare_v2(database,"SELECT * from userinfo;",-1,&statement,&zTail); const unsigned char *name; const unsigned char *password;int exp=0;NSString *newName = nil;NSString *newPassword = nil;NSData *imgData = nil;//sqlite3_reset(statement);if (SQLITE_ROW == sqlite3_step(statement)) {name = sqlite3_column_text(statement,1);password = sqlite3_column_text(statement,2);exp = sqlite3_column_int(statement,3);if (NULL != sqlite3_column_blob(statement,4)) {imgData = [ initWithBytes:sqlite3_column_blob(statement,4) length:sqlite3_column_bytes(statement, 1)];}newName = ;newPassword = ;}
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