SQL Server数据迁移至PostgreSQL出错的解释以及解决方案

问题重现：

1、PG客户端:

postgres=# create table text_test (id int,info text);
CREATE TABLE
postgres=# insert into text_test values (1,E'\0x00');
ERROR: invalid byte sequence for encoding "UTF8": 0x00

2、SQL Server产生数据

create table test_varchar(id int,name varchar(20));
insert into test_varchar values (1, 'name' + char(0));
insert into test_varchar values (1, 'name' + '');

然后通过java程序进行获取数据并插入到PG，同样会得到错误信息：

invalid byte sequence for encoding "UTF8": 0x00

首先我们认为此为gb2312转化到UTF8时，发生了无法转化的错误。经查UTF8是变长的, 1-6个字节。他的编码规则如下：

而0x00是符合UTF8规则的。这就使我们非常诧异。然后我们发现有两点继而确认了问题：
1、

PostgreSQL doesn't support storing NULL (\0x00) characters in text fields (this is obviously different from the database NULL value, which is fully supported).

If you need to store the NULL character, you must use a bytea field - which should store anything you want, but won't support text operations on it.

Given that PostgreSQL doesn't support it in text values, there's no good way to get it to remove it. You could import your data into bytea and later convert it to text using a special function (in perl or something, maybe?), but it's likely going to be easier to do that in preprocessing before you load it.

Source:http://stackoverflow.com/questions/1347646/postgres-error-on-insert-error-invalid-byte-sequence-for-encoding-utf8-0x0

2、