1

我正在尝试读取/写入 SQLite 数据库，但我不断收到错误。我已验证数据库存在于 ...iPhone Simulator/Applications/5.1/app#/Documents/kipSQLDB.db

我已经从终端完成了 INSERT 和 SELECT 。

但是从应用程序中它只是出错了。（附加问题 - sqlite 有没有办法在 mysql 中获取信息性错误消息，如 mysql_error？当我在应用程序中出错时，我只得到一些符号。

这是我的代码：

。H

#import <Foundation/Foundation.h>
#import <sqlite3.h>

@interface SQLiteController : NSObject { 

//file management
NSFileManager *fileManager;
NSString *documentsDirectory;

//sqlite data
sqlite3* databaseHandle;

}

- (void) initSQLiteDB; 

- (void) insertData : (NSString* ) fName : (NSString* ) lName : (NSString* ) companyName; 

- (NSArray* ) getData;

@end

.m

- (void) insertData : (NSString* ) fName : (NSString* ) lName : (NSString* ) companyName { 

NSString* insertStatement = [NSString stringWithFormat:@"INSERT INTO nameList (userFName, userLName, userCompany) VALUES (\"%@\", \"%@\", \"%@\")", fName, lName, companyName];
NSLog(@"%@", insertStatement);

char *error;
if ( sqlite3_exec(databaseHandle, [insertStatement UTF8String], NULL, NULL, &error) == SQLITE_OK) {

    int recordID = sqlite3_last_insert_rowid(databaseHandle);
    NSLog(@"A record was inserted into the database %@ with the id of %i", databaseHandle, recordID);
} else { 
    NSLog(@"Error: %s", error);
}
}

- (NSArray* ) getData {

NSMutableArray* dataArray = [[NSMutableArray alloc] init];

NSString* getStatement = @"SELECT * FROM nameList";

sqlite3_stmt *statement;
if (sqlite3_prepare_v2(databaseHandle, [getStatement UTF8String], -1, &statement, NULL) == SQLITE_OK){

    // Iterate over all returned rows
    while (sqlite3_step(statement) == SQLITE_ROW) {

        int recordID = sqlite3_column_int(statement, 0);
        NSString* fNameFromDB = [NSString stringWithUTF8String:(char*)sqlite3_column_text(statement, 1)];
        NSLog(@"%@", fNameFromDB);
    }
} else { 
    NSLog(@"No soup for you!");
}

return 0;

}
@end
4

3 回答 3

1

使用 Try catch 格式，捕获 sql 的错误类型

于 2012-06-18T12:09:18.690 回答
1

试试这个，我想它会对你有所帮助 

 - (void) insertData : (NSString* ) fName : (NSString* ) lName : (NSString* ) companyName { 

    if(insertStatement == nil)
    {

    NSString* insertStatement = [NSString stringWithFormat:@"INSERT INTO nameList (userFName, userLName, userCompany) VALUES (\"%@\", \"%@\", \"%@\")", fName, lName, companyName];
    NSLog(@"%@", insertStatement);
    if(sqlite3_prepare_v2(database, insertSql, -1, &insertStmt, NULL) != SQLITE_OK)
            NSAssert1(0, @"Error while creating insert statement. '%s'", sqlite3_errmsg(database));
    }


    sqlite3_bind_text(insertStatement, 1, [Gunameq UTF8String], -1, SQLITE_TRANSIENT);
    sqlite3_bind_text(insertStatement, 2, [Gpassq UTF8String], -1, SQLITE_TRANSIENT);
    if(SQLITE_DONE != sqlite3_step(insertStmt))
        NSAssert1(0, @"Error while inserting data. '%s'", sqlite3_errmsg(database));
    else
        NSLog("Inserted");
    //Reset the add statement.
    sqlite3_reset(insertStatement);
    insertStatement= nil;      

    - (NSArray* ) getData {

    NSMutableArray* dataArray = [[NSMutableArray alloc] init];

    NSString* getStatement = @"SELECT * FROM nameList";

    sqlite3_stmt *statement;
    if (sqlite3_prepare_v2(databaseHandle, [getStatement UTF8String], -1, &statement, NULL) == SQLITE_OK){

        // Iterate over all returned rows
        while (sqlite3_step(statement) == SQLITE_ROW) {

            int recordID = sqlite3_column_int(statement, 0);
            NSString* fNameFromDB = [NSString stringWithUTF8String:(char*)sqlite3_column_text(statement, 1)];
            NSLog(@"%@", fNameFromDB);
        }
    } else { 
        NSLog(@"No soup for you!");
    }

    return 0;

    }
    @end
于 2012-06-18T12:27:39.223 回答
-1

SQLite 可能有点棘手。对它的所有访问都必须来自同一个线程。对于每个准备语句，都必须有一个 finalize 语句。

这里有一个使用 SQLite 的示例项目，您可以参考：https ://github.com/AaronBratcher/ABSQLite

它有用于以更传统的数据库方式访问 SQLite 的类，我觉得这更容易。

于 2013-07-11T15:02:18.387 回答