连接 Erlang 和 mysql odbc 时出错

Posted 2023-03-15

【中文标题】连接 Erlang 和 mysql odbc 时出错

【英文标题】：Error connecting Erlang and mysql odbc

【发布时间】：2017-10-07 18:32:33

【问题描述】：

我有一个 Amazon linux 实例，我在上面安装了一个名为 ejabberd 的服务器 在里面我有一个用 erlang 编写的代码（db.erl）。

-module(db).
-export([connection/0]).
connection()->
odbc:start(),
ConnectionString = "DSN=qaz;UID=root;PWD=abc", 
ok, Ref = odbc:connect(ConnectionString, []),
Ref.

但是当我这段代码即将运行时，我得到一个错误

[error] gen_server myapp terminated with reason: no match of right hand 
value error,"[unixODBC][Driver Manager]Can't open lib 
'/usr/lib/libmyodbc5.so' : file not found SQLSTATE IS: 01000 Connection to 
database failed." in db:connection/0 line 15

10:34:15.111 [error] CRASH REPORT Process myapp with 0 neighbours exited 
with reason: no match of right hand value error,"[unixODBC][Driver 
Manager]Can't open lib '/usr/lib/libmyodbc5.so' : file not found SQLSTATE 
IS: 01000 Connection to database failed." in db:connection/0 line 15 in 
gen_server:terminate/7 line 812

10:34:15.111 [error] Supervisor frequency_sup had child myapp started with 
myapp:start() at <0.502.0> exit with reason no match of right hand value 
error,"[unixODBC][Driver Manager]Can't open lib '/usr/lib/libmyodbc5.so' : 
file not found SQLSTATE IS: 01000 Connection to database failed." in 
db:connection/0 line 15 in context child_terminated

我已经使用以下配置编辑了我的 /etc/odbc.ini 和 /root/.odbc.ini

[ODBC Data Sources]
qaz= ODBC for mysql



[qaz]
Driver      = /usr/lib64/libmyodbc5.so
Description = ODBC for MySQL
SERVER      = localhost
PORT        = 3306
USER        = root
Password    = abc
Database    = mydb

我的 odbcinst.ini 文件看起来像这样

# Example driver definitions

# Driver from the postgresql-odbc package
# Setup from the unixODBC package
[PostgreSQL]
Description = ODBC for PostgreSQL
Driver      = /usr/lib/psqlodbc.so
Setup       = /usr/lib/libodbcpsqlS.so
Driver64    = /usr/lib64/psqlodbc.so
Setup64     = /usr/lib64/libodbcpsqlS.so
FileUsage   = 1


# Driver from the mysql-connector-odbc package
# Setup from the unixODBC package
[MySQL]
Description = ODBC for MySQL
Driver      = /usr/lib/libmyodbc5.so
Setup       = /usr/lib/libodbcmyS.so
Driver64    = /usr/lib64/libmyodbc5.so
Setup64     = /usr/lib64/libodbcmyS.so
FileUsage   = 1

[MySQL ODBC 5.3 Unicode Driver]
Driver          = /usr/lib/libmyodbc5w.so
UsageCount              = 1

[MySQL ODBC 5.3 ANSI Driver]
Driver          = /usr/lib/libmyodbc5a.so
UsageCount              = 1

当我运行命令时

isql qaz [root [abc]]

我得到一个错误

[ISQL]ERROR: Could not SQLConnect

谁能告诉我这个问题并指导我在 linux 中设置 odbc 配置的正确方法 我已经在windows上成功了，但是我对linux不太熟悉。 提前谢谢你

【参考方案1】：

是mySQL提供的ODBC驱动（ODBC连接器）。有没有预装驱动？搜索如何安装mysql odbc驱动。

但是，我建议使用另一个 mysql 驱动程序，例如 mysql/otp 而不是 ODBC 驱动程序。我在使用带有 mySql 的 ODBC 驱动程序时遇到了问题。