Question

使用FreeTDS和Python3.5库PyPyodbc我试图在SQL Server数据库中插入一行（驻留在Windows上）时得到'Byte string too long'。在FreeTDS配置文件下，有一个可修改的'text size'我改为：

[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：

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

但错误一直出现，我错过了什么？

Answer 1

我终于找到了问题，除了在TDS_Version = 8.0中设置之外，PyPyodbc中字符缓冲区的分配还不够。我的查询超过3100个字符（至少）。直接更新PyPyodbc以使金额翻倍现在已足够。不确定是否需要四倍。

为什么没有将这个添加到库中？有关详细信息：https://github.com/jiangwen365/pypyodbc/issues/27

感谢@GordThompson帮助我解决问题并在自己的环境中进行测试。

字节字符串太长PyPyOdbc

1 个答案: