Support DESC {OWNER}.{TABLE} in MS SQL Server

Author: hymkor

dialect/sqlserver/columns.sql

@@ -0,0 +1,36 @@
+select  c.column_id as "ID",
+        c.name as "NAME",
+        case c.is_nullable
+            when 1 then 'NULL'
+            else 'NOT NULL'
+        end as "NULL?",
+        case
+            when t.name in ('char','varchar','nchar','nvarchar',
+                            'binary','varbinary')
+             and c.max_length > 0
+            then t.name + '(' +
+                 convert(varchar,
+                    case
+                        when t.name in ('nchar','nvarchar')
+                        then c.max_length/2
+                        else c.max_length
+                    end
+                 ) + ')'
+             else t.name
+        end as "TYPE"
+  from  sys.columns c,
+        sys.objects o,
+        sys.types   t,
+        sys.schemas s
+ where  c.object_id = o.object_id
+   and  o.name = case
+            when @p1 like '%.%' then parsename(@p1,1)
+            else @p1
+        end
+   and  o.schema_id = s.schema_id
+   and  s.name = case
+            when @p1 like '%.%' then parsename(@p1,2)
+            else schema_name()
+        end
+   and  c.user_type_id = t.user_type_id
+ order  by c.column_id

dialect/sqlserver/main.go

@@ -1,6 +1,7 @@
 package sqlserver
 
 import (
+	_ "embed"
 	"time"
 
 	_ "github.com/microsoft/go-mssqldb"
@@ -10,6 +11,9 @@ import (
 	"github.com/hymkor/sqlbless/dialect"
 )
 
+//go:embed columns.sql
+var columnSql string
+
 var typeSpec = map[string][2]string{
 	"DATE": {
 		"CAST(@v%d AS DATE)",
@@ -61,27 +65,8 @@ func formatValue(typeName string, value any) (string, bool) {
 }
 
 var sqlServerSpec = &dialect.Entry{
-	Usage: "sqlbless sqlserver://@<HOSTNAME>?database=<DBNAME>",
-	SQLForColumns: `
-	select c.column_id as "ID",
-		   c.name as "NAME",
-		   case
-			 when c.max_length > 0 then
-			   t.name + '(' + convert(varchar,c.max_length) + ')'
-			 else
-			   t.name
-		   end as "TYPE",
-		   case c.is_nullable
-			 when 1 then 'NULL'
-			 else 'NOT NULL'
-		   end as "NULL?"
-	  from sys.columns c,
-		   sys.objects o,
-		   sys.types t
-	 where c.object_id = o.object_id
-	   and o.name = @p1
-	   and c.user_type_id = t.user_type_id
-	 order by c.column_id`,
+	Usage:            "sqlbless sqlserver://@<HOSTNAME>?database=<DBNAME>",
+	SQLForColumns:    columnSql,
 	SQLForTables:     `select * from sys.tables`,
 	TypeConverterFor: typeNameToConv,
 	PlaceHolder:      &dialect.PlaceHolderName{Mark: "@", Prefix: "v"},