String patchwork batch Insert SQL statement with God Bug

Project, in order to implement the deletion of the original elements of the loop insert data intended to use a string piece of the way to piece together a batch of write data SQL, the following magic bug

Some of the statements in the patchwork were swallowed.

Turn on Debug View:

For the first time, the statements behind into are all swallowed.

The second piece, the statement completely disordered.

Check that the code is normal,

Decide to replace a way to write the implementation separately, first delete the completion and then write it (data verified legal)

String patchwork batch Insert SQL statement with God Bug