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this version of dbd::odbc contains a significant fix to unicode when inserting into char/varchar columns and it is a change in behaviour from 1.45. the change only applies to unicode builds of dbd::odbc (the default on windows but you can build it for unicode on unix too) and char/varchar columns and not nchar/nvarchar columns. this does not mean dbd::odbc will not work with your odbc driver but it is worth reporting any test failures on rt.cpan.org or to the dbi-users mailing list. set this before execute to “force” dbd::odbc to re-obtain the result set’s number of columns and column types for each execute. note that internally dbd::odbc only sets the query timeout if you set it explicitly and the default of 0 (no time out) is implemented by the odbc driver and not dbd::odbc. you may find this useful in an error handler as you can get the odbc diagnostics as they are and not how dbd::odbc was forced to fit them into the dbi’s system. be careful with this attribute as once set to anything larger than 1 (the default) you must retrieve all result-sets before the statement handle goes out of scope or you can upset the tds protocol and this can result in a hang. note: you may also want to use this option if you are creating temporary objects (e.g., tables) in ms sql server and for some reason cannot use the do method. parameters bound where the database declares the parameter as being a wide character, or where the parameter data is unicode, or where the parameter type is explicitly set to a wide type (e.g., sql_wxxx) are bound as wide characters in the odbc api and dbd::odbc encodes the perl parameters as utf-16 before passing them to the driver. however, the required support in some odbc drivers is a little sketchy and there is no way for dbd::odbc to ascertain this until it is too late. if these difference cause you a problem you can set odbc_array_operations to false and dbd::odbc will revert to dbi’s implementations of the array methods. note: this tracing is produced by the odbc driver manager and has nothing to do with dbd::odbc other than it should trace the odbc calls dbd::odbc makes i.e., dbd::odbc is not responsible for the tracing mechanism itself. note: to retrieve a lob like this you must first bind the lob column specifying bindaslob or dbd::odbc will 1) bind the column as normal and it will be subject to longreadlen and b) fail odbc_lob_read.
this function maps to the odbc sqlgettypeinfo api and the argument should be a sql type number (e.g. this is probably not a lot of use with dbd::odbc as if you ask for say an sql_integer and the data is not able to be converted to an integer the odbc driver will probably return “invalid character value for cast specification (sql-22018)”. dbd::odbc implements do by calling sqlexecdirect in odbc and not sqlprepare followed by sqlexecute so do is not the same as: it does this to avoid a round-trip to the server so it is faster. see the dbd::odbc faq and in general you are better to use prepare/execute when calling procedures. if the first problem of sql_diag_row_number proves to be a problem for you the dbd::odbc tracing will show all errors and you can also use “odbc_getdiagrec” yourself. the only time when the type passed to bind_col is used in dbd::odbc is when it is sql_numeric or sql_double in which case dbd::odbc will call dbi’s sql_type_cast method. this is ok, most of the time, but is probably not what you want when inserting a binary (use type => sql_binary). unicode strings in calls to the prepare and do methods are supported so long as the odbc_execdirect attribute is not used. the unicode support in dbd::odbc expects a wchar to be 2 bytes (as it is on windows and as the odbc specification suggests it is). dbd::odbc uses the wide character versions of the odbc api and the sql_wchar odbc type to support unicode in perl. if the odbc driver does not support sqldescribeparam, dbd::odbc assumes the parameters are sql_varchar or sql_wvarchar types (depending on whether dbd::odbc is built for unicode or not and whether your parameter is unicode data). what helps enormously to identify problems in the many combinations of dbd::odbc and odbc drivers is a large test suite. in this way module authors 1) get feedback on the fact that a module is being installed 2) get to know if there are any installation problems.
this version of dbd::odbc contains a significant fix to unicode when inserting into if you had perl scalars that were bound to char/varchar columns in an see t/20sqlserver.t for an example. the odbc driver manager parses this string (“data_source_name” in this example) and attempts to find it in the user the change only applies to unicode builds of dbd::odbc (the see t/ 20sqlserver.t for an example., perl odbc example, perl odbc example, perl dbi, perl dbd mssql.
using dbd::odbc. dbi is the database interface module for the perl installing unixodbc, perl dbi and dbd::odbc using standard instructions have shown truncation dbd::odbc is not intrinsically part of perl, but many distributions include it by default. it is possible to build it but that will ,
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