以编程方式将Sqlite表数据导出到csv文件

Question

可能重复:
以编程方式将Sqlite表数据导出到csv文件 - xcode iOS 5(适用于ipad应用)

我正在开发一个简单的应用程序 我正在使用sqlite将数据保存到表中(本地,在app documents文件夹中).我想在csv文件中导出此表数据并将其通过电子邮件发送给某人.我的意思是我想在iPad转换后物理访问csv文件....任何人都可以提供示例应用程序下载吗？还是代码？请帮忙

Answer 1

这应该给你一个好主意.假设一个包含2行的表,此代码读取表中的所有值并将它们写入NSString,然后将其写入文档目录中的CSV文件.如果您需要澄清如何使此代码适用于您的特定项目,请告诉我们.

    NSString *csv = [[NSString alloc] init];

    sqlite3 *database;

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *sqLiteDb
    = [documentsDirectory stringByAppendingPathComponent:@"INSERT_DATABASE_NAME.sqlite3"];


    if(sqlite3_open([sqLiteDb UTF8String], &database) == SQLITE_OK) {
        const char *sqlStatement = [[NSString stringWithFormat:@"SELECT * FROM myTable"] UTF8String];
        sqlite3_stmt *compiledStatement;
        if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {

           while(sqlite3_step(compiledStatement) == SQLITE_ROW) { 
             //this assumes that there are two rows in your database you want to get data from   
             [csv stringByAppendingFormat:@"%@,%@\n", [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)], [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)]];
           }

          sqlite3_finalize(compiledStatement);
          sqlite3_close(database);
        }else{
            NSLog(@"database error");
        }
    }

NSError *error = nil;
[csv writeToFile:[documentsDirectory stringByAppendingPathComponent:@"myFile.csv"]
      atomically:YES encoding:NSUTF8StringEncoding error:&error];

[csv release];