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Excel VBA 编程 -- 大数据量写入数据库(一)

  • 2026-04-08 21:11:54
Excel VBA 编程 -- 大数据量写入数据库(一)
在《Excel 编程 -- 访问数据库》篇,有朋友问:有没有一次性上传数据库的办法?遍历数据太慢。
为研究这个问题,先通过网络生成了一个含有 10 万条记录、每条记录 5 个字段的 Excel 数据表,如下图所示:
然后分别利用 VBA、Delphi、Python/Pandas 将这 10 万条记录的 Excel 数据表写入 SQL Server 2025 数据库,得到三种方式所花费的时间(单位:秒)如下:
由于 VBA 和 Delphi 都是通过 ADO 与数据库打交道,而且都是通过 Excel 获取数据,因此所花时间差不多,所差的那点时间可能就是 Delphi 编译为本机代码所带来的性能提升。
相反,Python/Pandas 是通过 OpenPyxl 直接读取 Excel 文件,并且通过 ODBC 与数据库沟通,因此性能提升非常明显。
今天我们先来看如果通过 VBA 代码将这 10 万条记录写入数据库。
先来看 VBA 的顶层代码:
WriteDataTest 过程是最顶层的测试代码,这个过程的功能是将 10 万条记录所在的 Range 转换为数组 rArray,然后用这个数组调用 WriteDataToDb。
WriteDataToDb 过程用了两个类模块,一个是先前定义的 Stopwatch,用来统计代码的执行时间。另一个是今天我们定义的 DbClient,用来与数据库打交道。
关于类模块的实例化方式,昨天已经讨论过。在 PiVBALib 中定义了两个 Create 函数,分别创建 Stopwatch 和 DbClient 类的实例。
DbClient 类中定义了一个 WriteDataToDb 的方法,用前面的数组作为参数,将该数组表示的数据集写入数据库。
Stopwatch 用来统计执行时间,并将结果写入 Sheet2 的 B2 单元格。
在进入 DbClient 的讨论之前,先来看在 PiVBALib 的过程模块中创建的 Create 函数:
CreateStopwatch 和 CreateDbClient 分别用来创建类 Stopwatch 和 DbClient 的实例,以供外部代码使用。
Stopwatch 类已经在前面的文章中讨论过了,今天主要讨论 DbClient。
在 DbClient 类中,首先声明两个私有变量,分别是表示数据库连接的 cn 和表示执行 SQL 语句的 cmd。然后是 DbClient 呈现给外界的公有过程 WriteDataToDb,这个过程接受一个 Variant 类型的参数,实际是一个二维数组。如果传递过来的不是一个表示二维数组的 Variant 类型,则在程序执行过程中会出错(LBound 和 UBound 函数对于非数组类型的参数会出错)。
WriteDataToDb 过程中的代码,首先是用 OpenConnection 打开与数据库的连接,然后遍历二维数组,每一行都生成一个 INSERT INTO 类型的 SQL 语句,向数据库表中插入一条记录。这个过程往复循环,直到遍历完所有的行。
最后调用 CloseConnection 关闭数据库连接。下面看 OpenConnection、CloseConnection、ExecuteSQL 三个过程的实现代码:
关于 Connection 和 Command,我们以前已经涉及过,但今天的不同在于“事务”这一概念。
从上面的代码中可以看出,在 cn.Open 之后,我们写了 cn.BeginTrans,在 cn.Close 之前,我们写了 cn.CommitTrans。这表示,在 cn.Open 和 cn.Close 之间执行的所有 SQL 语句(10 万条记录就有 10 条 INSERT INTO 类型的 SQL 语句),都作为一个“事务”进行处理。作为一个事务进行处理的好处是能显著提升数据库的性能。相反,如果不将这 10 万条 SQL INSERT 语句作为一个事务,则默认每一条 INSERT 语句都是一个单独的事务,这将大大降低批量插入数据的性能。
事务是数据库中一个很复杂的概念,今天只是简单涉及:将批量插入数据的 SQL 语句作为一个事务进行处理,能显著提升批量 SQL 语句的执行性能。
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Excel VBA 编程 -- 访问数据库

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  1. CONNECT:[ UseTime:0.001197s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001376s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000640s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000578s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001114s ]
  6. SELECT * FROM `set` [ RunTime:0.000445s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001317s ]
  8. SELECT * FROM `article` WHERE `id` = 474950 LIMIT 1 [ RunTime:0.001021s ]
  9. UPDATE `article` SET `lasttime` = 1775926535 WHERE `id` = 474950 [ RunTime:0.001764s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000511s ]
  11. SELECT * FROM `article` WHERE `id` < 474950 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000899s ]
  12. SELECT * FROM `article` WHERE `id` > 474950 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000908s ]
  13. SELECT * FROM `article` WHERE `id` < 474950 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001466s ]
  14. SELECT * FROM `article` WHERE `id` < 474950 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001418s ]
  15. SELECT * FROM `article` WHERE `id` < 474950 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001629s ]
0.183400s