fix MSSQL collation detection on freetds tds version 8.0

[dbsrgits/DBIx-Class-Schema-Loader.git] / lib / DBIx / Class / Schema / Loader / DBI / MSSQL.pm

diff --git a/lib/DBIx/Class/Schema/Loader/DBI/MSSQL.pm b/lib/DBIx/Class/Schema/Loader/DBI/MSSQL.pm
index 8fbba24..7a019d9 100644 (file)
--- a/lib/DBIx/Class/Schema/Loader/DBI/MSSQL.pm
+++ b/lib/DBIx/Class/Schema/Loader/DBI/MSSQL.pm
@@ -10,7 +10,7 @@ __PACKAGE__->mk_group_accessors('simple', qw/
     case_sensitive_collation
 /);
 
-our $VERSION = '0.05003';
+our $VERSION = '0.06000';
 
 =head1 NAME
 
@@ -27,6 +27,22 @@ L<DBD::ODBC>.
 See L<DBIx::Class::Schema::Loader> and L<DBIx::Class::Schema::Loader::Base> for
 usage information.
 
+=head1 CASE SENSITIVITY
+
+Most MSSQL databases use C<CI> (case-insensitive) collation, for this reason
+generated column names are lower-cased as this makes them easier to work with
+in L<DBIx::Class>.
+
+We attempt to detect the database collation at startup, and set the column
+lowercasing behavior accordingly, as lower-cased column names do not work on
+case-sensitive databases.
+
+To manually set or unset case-sensitive mode, put:
+
+    case_sensitive_collation => 1
+
+in your Loader options.
+
 =cut
 
 sub _is_case_sensitive {
@@ -40,17 +56,35 @@ sub _setup {
 
     $self->next::method;
 
+    return if defined $self->case_sensitive_collation;
+
     my $dbh = $self->schema->storage->dbh;
 
-    my ($collation_name) = $dbh->selectrow_array(<<'EOS');
-SELECT collation_name
-FROM sys.databases
-WHERE name = DB_NAME()
-EOS
+    # We use the sys.databases query for the general case, and fallback to
+    # databasepropertyex() if for some reason sys.databases is not available,
+    # which does not work over DBD::ODBC with unixODBC+FreeTDS.
+    #
+    # XXX why does databasepropertyex() not work over DBD::ODBC ?
+    #
+    # more on collations here: http://msdn.microsoft.com/en-us/library/ms143515.aspx
+    my ($collation_name) =
+           eval { $dbh->selectrow_array('SELECT collation_name FROM sys.databases WHERE name = DB_NAME()') }
+        || eval { $dbh->selectrow_array("SELECT CAST(databasepropertyex(DB_NAME(), 'Collation') AS VARCHAR)") };
+
+    if (not $collation_name) {
+        warn <<'EOF';
+
+WARNING: MSSQL Collation detection failed. Defaulting to case-insensitive mode.
+Override the 'case_sensitive_collation' attribute in your Loader options if
+needed.
+EOF
+        $self->case_sensitive_collation(0);
+        return;
+    }
 
-    my ($sensitivity) = $collation_name =~ /(C\w)_[A-z]+\z/;
+    my $case_sensitive = $collation_name =~ /_(?:CS|BIN2?)(?:_|\z)/;
 
-    $self->case_sensitive_collation($sensitivity eq 'CS' ? 1 : 0);
+    $self->case_sensitive_collation($case_sensitive ? 1 : 0);
 }
 
 sub _lc {
@@ -65,7 +99,7 @@ sub _tables_list {
     my $dbh = $self->schema->storage->dbh;
     my $sth = $dbh->prepare(<<'EOF');
 SELECT t.table_name
-FROM information_schema.tables t
+FROM INFORMATION_SCHEMA.TABLES t
 WHERE lower(t.table_schema) = ?
 EOF
     $sth->execute(lc $self->db_schema);
@@ -126,9 +160,9 @@ sub _table_uniq_info {
 
     my $sth = $dbh->prepare(qq{
 SELECT ccu.constraint_name, ccu.column_name
-FROM information_schema.constraint_column_usage ccu
-JOIN information_schema.table_constraints tc on (ccu.constraint_name = tc.constraint_name)
-JOIN information_schema.key_column_usage kcu on (ccu.constraint_name = kcu.constraint_name and ccu.column_name = kcu.column_name)
+FROM INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE ccu
+JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc on (ccu.constraint_name = tc.constraint_name)
+JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE kcu on (ccu.constraint_name = kcu.constraint_name and ccu.column_name = kcu.column_name)
 wHERE lower(ccu.table_name) = @{[ $dbh->quote(lc $table) ]} AND constraint_type = 'UNIQUE' ORDER BY kcu.ordinal_position
     });
     $sth->execute;
@@ -154,7 +188,7 @@ sub _columns_info_for {
 
         my $sth = $dbh->prepare(qq{
 SELECT column_name 
-FROM information_schema.columns
+FROM INFORMATION_SCHEMA.COLUMNS
 WHERE columnproperty(object_id(@{[ $dbh->quote(lc $table) ]}, 'U'), @{[ $dbh->quote(lc $col) ]}, 'IsIdentity') = 1
 AND lower(table_name) = @{[ $dbh->quote(lc $table) ]} AND lower(column_name) = @{[ $dbh->quote(lc $col) ]}
         });
@@ -167,7 +201,7 @@ AND lower(table_name) = @{[ $dbh->quote(lc $table) ]} AND lower(column_name) = @
 # get default
         $sth = $dbh->prepare(qq{
 SELECT column_default
-FROM information_schema.columns
+FROM INFORMATION_SCHEMA.COLUMNS
 wHERE lower(table_name) = @{[ $dbh->quote(lc $table) ]} AND lower(column_name) = @{[ $dbh->quote(lc $col) ]}
         });
         my ($default) = eval { $sth->execute; $sth->fetchrow_array };