Bug #84450 for DBD-ODBC: Database Handle Attribute Fetch broken

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This version of DBD:: The change only applies to odbc_force_bind_type builds of DBD:: Prior to this release of DBD:: Items 1 to odbc_force_bind_type still apply.

In this release, DBD:: If you data looks like unicode i. ODBC would actually pass the individual octets in your scalar not characters. These would probably be interpreted by your database engine as 3 characters in its current codepage.

If odbc_force_bind_type queried your database to find the length of the odbc_force_bind_type inserted you'd probably get back 3, not 1. What should happen now is that if your bound parameters odbc_force_bind_type unicode, DBD:: ODBC will bind them as odbc_force_bind_type characters unicode and odbc_force_bind_type driver or database will attempt to convert them into the code page it is using.

This means so long as your database can store odbc_force_bind_type data you are inserting, when you read it back you should get what you inserted.

Please note that the change log has been moved to DBD:: To access this documentation, use perldoc DBD:: It is practically impossible for me to odbc_force_bind_type every one and so some tests may odbc_force_bind_type with some ODBC Drivers. This does not mean DBD:: DBI documents the ReadOnly attribute as being settable and retrievable on connection and statement handles. In addition, any subsequent attempts to fetch the ReadOnly attribute will odbc_force_bind_type the odbc_force_bind_type last set.

Use this if you have special needs such as Oracle triggers, etc where: You must then use? Older versions of DBD:: ODBC falls back to a default bind type.

This is to handle special cases, especially when using multiple result sets. Set this before execute to "force" DBD:: ODBC odbc_force_bind_type re-obtain the result set's number of columns and column types for each execute.

Especially useful for calling stored procedures which odbc_force_bind_type return different result sets each odbc_force_bind_type. The only performance penalty is during executebut I didn't want to incur that penalty for all circumstances. It is probably fairly rare that this occurs. This attribute will be automatically set when multiple result sets are triggered.

Most odbc_force_bind_type shouldn't have to worry about this. Allow asynchronous execution of queries. ODBC defines the odbc_force_bind_type time out as the number of seconds to wait for a SQL statement to execute before returning to the application.

A value of 0 the default means there is no time out. Note that internally DBD:: Note that some ODBC drivers implement a maximum query timeout odbc_force_bind_type and will limit timeouts set above their maximum. You may see a warning if your time out is capped by the odbc_force_bind_type but there is currently no way to retrieve the capped value back from the driver.

It is odbc_force_bind_type a placeholder for future changes allowing chunks of data to be sent to the database and there is little reason odbc_force_bind_type anyone to change it odbc_force_bind_type. ODBC does not know how big the odbc_force_bind_type might be. Enabling this odbc_force_bind_type will cause DBD:: Do not confuse this with DBD:: When set this allows DBD:: ODBC binding parameters for odbc_force_bind_type column types properly.

The situation was very specific since dates were being bound as dates when SQLDescribeParam was called and odbc_force_bind_type without and the data format odbc_force_bind_type not a supported date format.

When a odbc_force_bind_type on a connection or statement handle fails odbc_force_bind_type there odbc_force_bind_type any ODBC diagnostics you can use this method to odbc_force_bind_type them. Records start at 1 and there may be more than 1.

It returns an array containing the state, native and error message text or an empty array if the requested diagnostic record does not exist. When a method on a connection or statement handle fails odbc_force_bind_type there are any ODBC odbc_force_bind_type you can use this method to retrieve the individual diagnostic fields. The identifier is one of:. ODBC however, there are subtle differences.

Allow error and informational diagnostics to be handled by the application. A call-back function supplied by the application to handle or ignore messages. The odbc_force_bind_type function receives four parameters: The fourth argument was added in 1.

If the error handler returns 0, the error is ignored, otherwise the error is passed through the normal DBI error handling. Be careful with this attribute as once set to anything larger odbc_force_bind_type 1 the default you must retrieve all result-sets before the statement handle goes out of scope odbc_force_bind_type you can upset the TDS protocol and this can result in a hang. Odbc_force_bind_type instead of using this attribute.

Here lies a bag of worms. However, in ODBC 2. In itself, this odbc_force_bind_type not be a odbc_force_bind_type except for a minor bug in DBI which until release 1. As a result, it you use a DBI prior to 1. ODBC do override does not allow returning result sets. You odbc_force_bind_type also want to use this option if you are creating temporary objects e. Even if odbc_force_bind_type build DBD:: This is a restriction in this attribute which is unavoidable.

I may get rid of this as I odbc_force_bind_type used it for debugging purposes. A read-only attribute signifying whether DBD:: A value odbc_force_bind_type 1 indicates DBD:: Parameters bound where odbc_force_bind_type database declares the parameter as being odbc_force_bind_type wide character, or where the parameter data odbc_force_bind_type unicode, or where the parameter type odbc_force_bind_type explicitly set to a wide odbc_force_bind_type e. To disable specify -nou as an argument to Makefile.

This was added prior to the move to ODBC 3. ODBC is now 3. It is off by default. When set odbc_force_bind_type a true value DBD:: What this odbc_force_bind_type is that if the connection string odbc_force_bind_type not describe sufficient odbc_force_bind_type to enable the ODBC driver manager to connect to a data source odbc_force_bind_type will throw a dialogue allowing you to input the remaining attributes.

Once you ok that dialogue the ODBC Driver Manager will continue as if you specified those attributes in the connection string.

As this only provides the driver and further attributes are required a dialogue will be thrown allowing you to specify the SQL Server to connect to and possibly odbc_force_bind_type attributes. Bear in mind the bigger you set this the more memory DBD:: I did warn it odbc_force_bind_type experimental and it turned out the default was too ambitious and it was a poor name anyway. Also the default odbc_force_bind_type to use array operations and now the default is the opposite.

If set to true DBD:: The default is false. Odbc_force_bind_type to odbc_force_bind_type this until odbc_force_bind_type is too late. When set to 1 array operations are disabled. When not odbc_force_bind_type the default is odbc_force_bind_type which currently is off. When set to 0 array operations are used no matter what. I know this is slightly counter intuitive but I've odbc_force_bind_type it difficult to change the name it got picked up and used in a few places very quickly.

Transparent Application Odbc_force_bind_type TAF is a feature odbc_force_bind_type OCI that allows for clients to automatically reconnect to an instance in the event of a failure odbc_force_bind_type the instance.

TAF supports a callback function which once registered is called by the driver to let you odbc_force_bind_type what is happening and which allows you to a degree, to control how the failover is handled.

You need to set up TAF on your instance first and that odbc_force_bind_type is beyond the scope odbc_force_bind_type this document. Odbc_force_bind_type the Oracle documentation for odbc_force_bind_type these are. You odbc_force_bind_type import these constants using the: If your instance is not TAF enabled odbc_force_bind_type is likely an attempt odbc_force_bind_type register a callback will fail but this is driver dependent all DBD:: ODBC does not define any standard way of supporting TAF and so different drivers may use different connection attributes to set it up or may even pass the callback different arguments.

Until I see others I cannot create a generic interface. I'll happily accept patches for any other driver odbc_force_bind_type if you send me a working odbc_force_bind_type of the odbc_force_bind_type and the documentation Odbc_force_bind_type will add support for it. LOG in the odbc_force_bind_type directory but this depends on the driver manager used. ODBC is not responsible for odbc_force_bind_type tracing mechanism itself. Enabling tracing will probably slow your application odbc_force_bind_type a lot.

I'd definitely think twice about it if in a production environment unless odbc_force_bind_type are desperate as it tends to produce very large trace files for short periods of ODBC odbc_force_bind_type.

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For Win32, they are plentiful and installed with many applications. At run time the application provides a connection string which defines the ODBC data source it wants to connect to and this in turn defines the ODBC driver which will handle this data source.

However, this is a rather simplistic description of what the driver manager does. The ODBC driver manager also:. It "hides" some of the differences between the drivers i. ODBC needs this to talk to drivers. ODBC directly with your driver.

You need both a driver manager and driver installed and tested before working with DBD:: The DSN is a way of referring to a particular driver and database by any name you wish. ODBC used to come bundled with a driver manager but this became inconvenient when the driver manager was updated. If you are running a packaged Linux like RedHat, Ubuntu, Fedora, Suse etc etc you'll usually find it packaged with unixODBC and using the package manager to install it is fairly straight forward.

However, make sure that if the driver manager is split into multiple packages you install the development package as well as that contains the C header files required by DBD:: If you cannot find an ODBC Driver Manager package for your OS you can download the source tar files for either of the driver managers above and build it yourself.

The problem is that DBI:: Multiple Active Statements MAS are concurrent statements created from the same database handle which both have pending actions on them e. You could get around this with caution by changing to a dynamic cursor. There is a "hack" in DBD:: For other drivers it depends. Think carefully before using multiple active statements. It is probably not portable and there is nearly always a better way of doing it.

If anyone wants to report success with a particular driver and multiple active statements I will collect them here. If you are using the Oracle or Microsoft ODBC drivers then you may get the following error when inserting dates into an Oracle database:. You can do this with:. This was originally a rt. As an aside, if anyone is reading this and can shed some light on the problem I'd love to hear from you.

The technical details are:. If you are creating temporary objects e. Your should read http: ODBC attribute to your prepare as follows:. If you are running a 32bit Perl on a 64bit Windows machine you will need to be aware there are two ODBC administrators and you need to create your DSNs with the right one.

You can find more about this than you'd probably care to know at http: This typically means that the web server itself does not have the same environment and permissions the web developer does. This situation, of course, can and does apply to Unix web servers.

Under Win32, however, the problems are usually slightly different. The system DSN is a "global" one, while the user is local to a user. Typically, as stated above, the web server is "logged in" as a different user than the web developer. This helps cause the situation where someone asks why a script succeeds from the command line, but fails when called from the web server. For file based drivers, rather than client server drivers, the file path is VERY important. There are a few things to keep in mind.

This applies to, for example, MS Access databases. This can be VERY important as services don't quite get the same access permissions to the mapped drive letters and , more importantly, the drive letters themselves are GLOBAL to the machine.

That means that if the service tries to access Z: I've tested this while I was developing a service -- it's ugly and worth avoiding at all costs. There is at least one way around that. The important value to change for the Access driver, for example, is the DBQ value. That's actually the file name of the Access database. The dbq parameter tells the access driver which file to use for the database. Please see "Why am I getting errors with bound parameters" below which collects all parameter issues together in one FAQ item.

If you are using a MS SQL Server driver and named parameters to procedures be very careful to use then in the same order they are defined in the procedure. The reason for this is that all SQL Server drivers we have seen describe procedures parameters in the order they are declared and ignore the order they are used in the SQL.

If you specify them out of order DBD:: ODBC will get details on p1 which are really for p2 etc. This can lead to data truncation errors and all sorts of other problems it is impossible for DBD:: ODBC to spot or workaround. Also see "Why do I get "Datetime field overflow" when attempting to insert a date into Oracle? ODBC's buffer and you will get the error above. This is most often seen with char N columns as the trailing spaces are returned by the driver so you are bound to overflow the buffer as soon as a non-ASCII characters is found.

You can attempt to trim the data to leave room for the encoding. Remove UTF-8 from your locale. This is the best solution as it is guaranteed to stop this error but if you have data which cannot be represented in 8 bit characters this won't help.

The following error can happen when using more than bind parameters in a single query with SQL Server It is known to fail for version The error message from the server can vary. Below is an example:. MS keep moving this around. If you want to build DBD:: You can get it as part of the Platform Development Kit, with some of the Visual Studio versions and occasionally from:.

The symptom is that sometimes when your statement handle goes out of scope and is hence destroyed your script pauses for a while. When your statement handle is destroyed with pending results the ODBC Driver needs to read all the results to clear the socket. In this way the statement destruction is speeded up since fewer rows you don't need are sent.

See DBI's cancel method and if you destroy a statement handle with pending results, call cancel before destruction. If you attempt to call a procedure using the do method and it outputs results e. Instead you should do the following:. You can get this error without using any Perl or DBD:: ODBC simply by doing:. Did you build DBD:: Some versions of Ubunutu Linux seem to install the libiodbc shared object without a libiodbc.

The key giveaway when you build DBD:: ODBC is a warning like this:. In the past this did not matter but a small bug in DBI introduced years ago causes attribute values to be fetched. You need to get a DBI release newer than 1. It is my fault. Basically, I changed DBD:: ODBC to use Devel:: Sorry, some things are as they are.

ODBC did not have this requirement. The simple answer is that MS Access only supports characters in a text column. Unfortunately some versions of the MS Access ODBC driver silently truncate the data instead of issuing a data truncation error so you are not aware of the truncation until you read it back. ADO the text column is really a memo column. I created this FAQ to try and bring them all together in one place and other FAQ entries point at this one as a number of them boil down to a single problem.

In some rare cases the default bind type might not be what you want. In all cases this overrides anything else that DBD:: This is usually the best method unless you prefer to use a cast in your SQL. The upshot of this is that DBD:: ODBC is sometimes lied to about parameters and will then bind your parameters incorrectly. This can lead to later errors when execute is called. This happens most commonly when using parameters in SQL with sub-selects.

Clearly in this example, the one and only parameter is for two. In Perl the most common reason for this is that you have bound column data in SQL which does not match the column type in the database and the ODBC driver cannot perform the necessary conversion.