Problems and solutions of VFP accessing Oracle under 64 bit win10 environment

author ： Green tea @ Fox Friends Association
Previously used VFP stay 64 position WIN7 Connect and access in the environment oracle, Whether it is a / C set setting 、 Or use code to access data remotely , There have been no problems , Recently, I changed a machine , Installed 64 position WIN10 System , Follow the old routine , When testing connections and accessing databases , But there are always problems , Tossed for days , Finally, the problem was solved .

Now the pit has been filled up , In order to avoid people suffering from similar problems , Now record the whole process and solution as follows , For your reference .

VFP The remote access oracle, I used to install oracle 9i Compact client , As the access driver , Because the client size of the thin version is only ten megabytes , Easy to install .

Follow the old routine , Installed and configured 9i After the client , Then use the A / C set setting tool , Make a test connection , Here's the picture , You can see , Test success .

then , As before , Start writing code to test ：

ocon = NEWOBJECT(“qiyu_connection”,“qiyu Superclass ”,“”,“test”)

ncon = ocon.createcon()

?‘ncon=’,ncon

however , Something magical has happened ,ncon Unexpectedly return -1, in other words , Connection failed . This code has been written many times before , There will be no problem , Besides, , In a / C set settings , It clearly shows that the test is successful .

I'm a little confused , To Con_set See in the table , You can see that both servername,Uid, still Pwd, as well as port etc. , There's no problem .

Then think of ,VFP It's through ODBC To connect and access oracle Of , So I came to the control panel , Be careful ,64 There are two bit systems odbc, To use 32 Bit , Here's the picture ：

Input various parameters , Test connection , You can see that the connection is successful , This explanation oracle There is no problem with the driver , adopt Oracle ODBC It can be connected and accessed normally oracle.

There is no problem with the driver , Using the A / C set setting tool can also test successfully , When it comes to using code testing, problems arise , This is not the ghost ？

here , Think of the previous articles in teacher cat's official account ： No client installation configuration VFP Connect Oracle database , It's really just using oracle Lightweight client for instant client Methods , To connect and access oracle, in other words , use instant client To replace the previous oracle 9i Compact client .

uninstall oracle 9i, install and configure instant cliet, Be careful , Also needed 32 Bit version , After all environment variables are configured , Go to the... Of the control panel first ODBC Medium test , Same as above ,ODBC return Connection successful, explain instant client There is no problem with the configuration .

Re execute the above code ：

ocon = NEWOBJECT(“qiyu_connection”,“qiyu Superclass ”,“”,“test”)

ncon = ocon.createcon()

?‘ncon=’,ncon

result , Still return to -1, This time, I was really cheated .

Last , Modify the connection string in the cat box , The original Driver={Microsoft ODBC for Oracle};server= Change it to Driver={Oracle in instantclient_12_2};dbq=, Execute the above code again , Finally, the connection is successful ,ncon You can return a positive number .

perhaps , Follow teacher cat's advice , Do not modify the frame , First create your own handle using the connection string ：

m.lcConn = “Driver={Oracle in instantclient_12_2};Dbq=;Uid=;Pwd=***;”

m.handle = SQLSTRINGCONNECT(m.lcConn)

This handle is then passed in :

oDbHelper=NEWOBJECT(“MSSQLHelper”,“MSSQLHelper.prg”,“”,m.handle)

This method can also be used ( I didn't test ).

however , It always feels bad to do this , First, the framework needs to be modified , and ,driver String , It will be installed with instant client Different versions , therefore , I still feel that I still use oracle 9i Thin client for , This makes it more versatile .

Delete instant client Environment variables of , go back to oracle 9i, And turn over all kinds of Posts again , Finally I found the problem .

The Internet says yes ： Run connection Oracle The directory name of the program cannot contain parentheses . And this time I installed VFP when , The installation directory is D:\Program Files (x86)\VFP9, Is this really the problem ？

Unload immediately VFP, Re install to D:\Program Files\VFP9, All the codes have not changed , Continue testing ,ncon The value of becomes positive , The connection is successful ！

At this time, I really feel like a boat capsized in the gutter , This is because the directory contains parentheses , I have been busy for several days .

The conclusion is as follows ：VFP The remote access oracle, have access to oracle 9i Thin client for , You can also use instant client, In fact, both of them play the role of access driven .

But I personally still like to use 9i client , Because after installation , It can be configured automatically ( Of course ,tnsnames.ora You need to configure it yourself ), Don't be like instant client, You need to manually configure three environment variables .