@@ -2514,10 +2514,18 @@ Options is same as C<delete>.

         }

     );

-Iterate all column informations of all table from database.

-Argument is callback when one column is found.

-Callback receive four arguments, dbi object, table name,

-column name and column information.

+Iterate all column informations in database.

+Argument is callback which is executed when one column is found.

+Callback receive four arguments. C<DBIx::Custom object>, C<table name>,

+C<column name>, and C<column information>.

+

+If C<user_column_info> is set, C<each_column> method use C<user_column_info>

+infromation, you can improve the performance of C<each_column> in

+the following way.

+

+    my $column_infos = $dbi->get_column_info(exclude_table => qr/^system_/);

+    $dbi->user_column_info($column_info);

+    $dbi->each_column(sub { ... });

 =head2 C<each_table>

@@ -2529,10 +2537,18 @@ column name and column information.

         }

     );

-Iterate all table informationsfrom database.

-Argument is callback when one table is found.

-Callback receive three arguments, dbi object, table name,

-table information.

+Iterate all table informationsfrom in database.

+Argument is callback which is executed when one table is found.

+Callback receive three arguments, C<DBIx::Custom object>, C<table name>,

+C<table information>.

+

+If C<user_table_info> is set, C<each_table> method use C<user_table_info>

+infromation, you can improve the performance of C<each_table> in

+the following way.

+

+    my $table_infos = $dbi->get_table_info(exclude => qr/^system_/);

+    $dbi->user_table_info($table_info);

+    $dbi->each_table(sub { ... });

 =head2 C<execute>

@@ -2742,7 +2758,7 @@ Turn C<into2> type rule off.

 =head2 C<get_column_info>

-    my $tables = $dbi->get_column_info(exclude_table => qr/^system_/);

+    my $column_infos = $dbi->get_column_info(exclude_table => qr/^system_/);

 get column infomation except for one which match C<exclude_table> pattern.

@@ -2753,7 +2769,7 @@ get column infomation except for one which match C<exclude_table> pattern.

 =head2 C<get_table_info>

-    my $tables = $dbi->get_table_info(exclude => qr/^system_/);

+    my $table_infos = $dbi->get_table_info(exclude => qr/^system_/);

 get table infomation except for one which match C<exclude> pattern.

@@ -3467,14 +3483,6 @@ is executed, the following SQL is executed.

 Execute update statement for all rows.

 Options is same as C<update> method.

-=head2 C<update_param>

-

-    my $update_param = $dbi->update_param({title => 'a', age => 2});

-

-Create update parameter tag.

-

-    set title = :title, author = :author

-

 =head2 C<update_or_insert EXPERIMENTAL>

     # Where