字节字符串太长PyPyOdbc [英] Byte string too long PyPyOdbc

问题描述

使用FreeTDS和Python3.5库PyPyodbc尝试在SQL Server数据库(位于Windows中)中插入一行时，出现了'Byte string too long'的错误. 在FreeTDS conf文件下，有一个我已更改为的'text size'副版本:

Using FreeTDS and Python3.5 library PyPyodbc I am getting a 'Byte string too long' when trying to insert a row in the SQL Server database (residing on Windows). Under FreeTDS conf file there is a vairable 'text size' that I changed to:

[global]
text size = 4294967295

这是配置文件

/etc/freetds/freetds.conf
[global]
      tds version = 4.2
      text size = 4294967295

[sqlserver]
      host = 192.168.0.3
      port = 1433
      tds version = 8.0

/etc/odbc.ini
[sqlserverdatasource]
Driver = freetds
Description = SQL Server
Servername = sqlserver
Database = MyDB
TDS_Version = 8.0

/etc/odbcinst.ini    
[freetds]
Description = MS SQL
Driver = /usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so
Setup = /usr/lib/x86_64-linux-gnu/odbc/libtdsS.so
Trace = Yes
TraceFile = /tmp/freetds.log
FileUsage = 1
UsageCount = 1

执行'tsql -C':

Compile-time settings (established with the "configure" script)
                            Version: freetds v0.91
             freetds.conf directory: /etc/freetds
     MS db-lib source compatibility: no
        Sybase binary compatibility: yes
                      Thread safety: yes
                      iconv library: yes
                        TDS version: 4.2
                              iODBC: no
                           unixodbc: yes
              SSPI "trusted" logins: no
                           Kerberos: yes

执行'/usr/bin/tsql -S 192.168.0.3 -U user':

Password: 
locale is "en_US.UTF-8"
locale charset is "UTF-8"
using default charset "UTF-8"

执行'odbcinst -j':

unixODBC 2.3.1
DRIVERS............: /etc/odbcinst.ini
SYSTEM DATA SOURCES: /etc/odbc.ini
FILE DATA SOURCES..: /etc/ODBCDataSources
USER DATA SOURCES..: /home/metheUser/.odbc.ini
SQLULEN Size.......: 8
SQLLEN Size........: 8
SQLSETPOSIROW Size.: 8

Python PyPyodbc连接字符串:

Python PyPyodbc connection string:

connStr = 'DSN=sqlserverdatasource;Database=MyDB;uid=user;pwd=password'

但是错误不断出现，我所缺少的是什么?

But the error keeps appearing, what I am missing?

推荐答案

我终于发现了问题，除了在TDS_Version = 8.0中设置之外，在PyPyodbc中分配字符缓冲区还不够.我的查询至少有3100个字符.现在，直接将PyPyodbc更新为两倍即可.不确定是否需要四倍.

I finally found the problem, other than set in TDS_Version = 8.0, the allocation for a character buffer in PyPyodbc is not enough. My query has more than 3100 characters (at a minimum). Updating the PyPyodbc directly to double the amount was sufficient for now. Not sure if quadrupling it will be necessary.

为什么没有将此内容添加到库中?有关更多信息: https://github.com/jiangwen365/pypyodbc/issues/27

Why this not had been added to the library? For more info: https://github.com/jiangwen365/pypyodbc/issues/27

感谢 @GordThompson 帮助我发现各种可能性，并在他自己的环境中进行测试.

Thanks to @GordThompson to help me out with the possibilities and test it on his own environment.

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