我遇到了一个有时在 unixODBC 和 freeTDS 周围发生的问题。我有一个 CentOS 网络服务器，我将配置文件设置为：
odbc.ini：
[XYZ]
Driver = FreeTDS
Server = X.X.X.X
Port = 1433
Database = mydatabase
TDS_Version = 8.0
odbcinst.ini
[PostgreSQL]
Description = ODBC for PostgreSQL
Driver = /usr/lib/libodbcpsql.so
Setup = /usr/lib/libodbcpsqlS.so
FileUsage = 1
[FreeTDS]
Description = v0.82 with protocol v8.0
Driver = /usr/local/lib/libtdsodbc.so
Setup = /usr/local/lib/libtdsodbc.so
UsageCount = 1
Trace = Yes
TraceFile = /tmp/freetds.log
ForceTrace = Yes
FileUsage = 1
[ODBC]
;Trace = Yes
;TraceFile = /tmp/freetds.log
;ForceTrace = Yes
;Pooling = No
freetds.conf
# $Id: freetds.conf,v 1.12 2007/12/25 06:02:36 jklowden Exp $
#
# This file is installed by FreeTDS if no file by the same
# name is found in the installation directory.
#
# For information about the layout of this file and its settings,
# see the freetds.conf manpage "man freetds.conf".
# Global settings are overridden by those in a database
# server specific section
[global]
# TDS protocol version
tds version = 8.0
# Whether to write a TDSDUMP file for diagnostic purposes
# (setting this to /tmp is insecure on a multi-user system)
; dump file = /tmp/freetds.log
; debug flags = 0xffff
# Command and connection timeouts
; timeout = 10
; connect timeout = 10
# If you get out-of-memory errors, it may mean that your client
# is trying to allocate a huge buffer for a TEXT field.
# Try setting 'text size' to a more reasonable limit
text size = 64512
# A typical Sybase server
[egServer50]
host = symachine.domain.com
port = 5000
tds version = 5.0
# A typical Microsoft server
[egServer70]
host = ntmachine.domain.com
port = 1433
tds version = 7.0
[XYZ]
host = X.X.X.X
port = 1433
tds version = 8.0
并在无法连接时执行 isql -v XYZ 用户名密码，它会给出以下跟踪日志：
[ODBC][22870][__handles.c][444]
Exit:[SQL_SUCCESS]
Environment = 0x938ab58
[ODBC][22870][SQLAllocHandle.c][345]
Entry:
Handle Type = 2
Input Handle = 0x938ab58
[ODBC][22870][SQLAllocHandle.c][463]
Exit:[SQL_SUCCESS]
Output Handle = 0x938b130
[ODBC][22870][SQLConnect.c][3549]
Entry:
Connection = 0x938b130
Server Name = [XYZ][length = 14 (SQL_NTS)]
User Name = [username][length = 11 (SQL_NTS)]
Authentication = [*************][length = 13 (SQL_NTS)]
UNICODE Using encoding ASCII 'ISO8859-1' and UNICODE 'UCS-2LE'
DIAG [42000] [FreeTDS][SQL Server]Login failed for user 'username'.
DIAG [42000] [FreeTDS][SQL Server]Cannot open database "mydatabase" requested by the login. The login failed.
DIAG [S1000] [FreeTDS][SQL Server]Unable to connect to data source
[ODBC][22870][SQLConnect.c][3917]
Exit:[SQL_ERROR]
[ODBC][22870][SQLError.c][424]
Entry:
Connection = 0x938b130
SQLState = 0xbf8ba54e
Native = 0xbf8ba350
Message Text = 0xbf8ba359
Buffer Length = 500
Text Len Ptr = 0xbf8ba356
[ODBC][22870][SQLError.c][461]
Exit:[SQL_SUCCESS]
SQLState = S1000
Native = 0xbf8ba350 -> 0
Message Text = [[unixODBC][FreeTDS][SQL Server]Unable to connect to data source]
[ODBC][22870][SQLError.c][424]
Entry:
Connection = 0x938b130
SQLState = 0xbf8ba54e
Native = 0xbf8ba350
Message Text = 0xbf8ba359
Buffer Length = 500
Text Len Ptr = 0xbf8ba356
[ODBC][22870][SQLError.c][461]
Exit:[SQL_SUCCESS]
SQLState = 37000
Native = 0xbf8ba350 -> 4060
Message Text = [[unixODBC][FreeTDS][SQL Server]Cannot open database "mydatabase" requested by the login. The login failed.]
[ODBC][22870][SQLError.c][424]
Entry:
Connection = 0x938b130
SQLState = 0xbf8ba54e
Native = 0xbf8ba350
Message Text = 0xbf8ba359
Buffer Length = 500
Text Len Ptr = 0xbf8ba356
[ODBC][22870][SQLError.c][461]
Exit:[SQL_SUCCESS]
SQLState = 37000
Native = 0xbf8ba350 -> 18456
Message Text = [[unixODBC][FreeTDS][SQL Server]Login failed for user 'username'.]
[ODBC][22870][SQLError.c][424]
Entry:
Connection = 0x938b130
SQLState = 0xbf8ba54e
Native = 0xbf8ba350
Message Text = 0xbf8ba359
Buffer Length = 500
Text Len Ptr = 0xbf8ba356
[ODBC][22870][SQLError.c][461]
Exit:[SQL_NO_DATA]
[ODBC][22870][SQLError.c][504]
Entry:
Environment = 0x938ab58
SQLState = 0xbf8ba54e
Native = 0xbf8ba350
Message Text = 0xbf8ba359
Buffer Length = 500
Text Len Ptr = 0xbf8ba356
[ODBC][22870][SQLError.c][541]
Exit:[SQL_NO_DATA]
[ODBC][22870][SQLFreeHandle.c][268]
Entry:
Handle Type = 2
Input Handle = 0x938b130
[ODBC][22870][SQLFreeHandle.c][317]
Exit:[SQL_SUCCESS]
[ODBC][22870][SQLFreeHandle.c][203]
Entry:
Handle Type = 1
Input Handle = 0x938ab58
当 tsql 命令起作用时……可能是什么？
unixODBC 版本是 2.2.11-7.1 并且 freeTDS 没有显示为已安装但它存在，因为 /usr/local/lib.. 中存在 libtdsodbc.so
我还不得不说，只有完全重新启动 CentOS 机器 isql 才能恢复正常工作......
我可以做什么或检查什么？提前非常感谢！
干杯，路易吉