Refactor: dialect/postgresql: move SQLs from main.go to *.sql using "embed"

Author: hymkor

dialect/postgresql/columns.sql

@@ -0,0 +1,11 @@
+select  attname as "NAME",
+        case 
+            when attnotnull then 'NOT NULL'
+            else 'NULL'
+        end as "NULL?",
+        format_type(atttypid, atttypmod) as "TYPE"
+  from  pg_attribute
+ where  attrelid = to_regclass($1)::oid
+   and  attnum > 0
+   and  not attisdropped
+ order  by attnum

dialect/postgresql/main.go

@@ -1,6 +1,7 @@
 package postgres
 
 import (
+	_ "embed"
 	"fmt"
 	"strings"
 	"time"
@@ -11,6 +12,12 @@ import (
 	"github.com/hymkor/sqlbless/internal/misc"
 )
 
+//go:embed tables.sql
+var tablesSql string
+
+//go:embed columns.sql
+var columnsSql string
+
 var postgresTypeNameToFormat = map[string][2]string{
 	"TIMESTAMPTZ": [2]string{"TIMESTAMP WITH TIME ZONE", dialect.DateTimeTzLayout},
 	"TIMESTAMP":   [2]string{"TIMESTAMP", dialect.DateTimeLayout},
@@ -44,55 +51,9 @@ func (ph *placeHolder) Values() (result []any) {
 }
 
 var postgresSpec = &dialect.Entry{
-	Usage: "sqlbless postgres://<USERNAME>:<PASSWORD>@<HOSTNAME>:<PORT>/<DBNAME>?sslmode=disable",
-	SQLForColumns: `
-		with target as (
-			select to_regclass($1)::oid as oid
-		)
-		select
-			a.attname as "NAME",
-			case a.attnotnull
-				when true then 'NOT NULL'
-				else 'NULL'
-			end as "NULL?",
-			format_type(a.atttypid, a.atttypmod) as "TYPE"
-		from target t
-		join pg_attribute a
-		  on a.attrelid = t.oid
-		where a.attnum > 0
-		  and not a.attisdropped
-		order by a.attnum`,
-	SQLForTables: `
-		select
-			n.nspname || '.' || c.relname as full_name,
-			n.nspname as table_schema,
-			c.relname as table_name,
-			case c.relkind
-				when 'r' then 'BASE TABLE'
-				when 'p' then 'PARTITIONED TABLE'
-				when 'v' then 'VIEW'
-				when 'm' then 'MATERIALIZED VIEW'
-				when 'f' then 'FOREIGN TABLE'
-			end as table_type,
-			c.reltuples::bigint as estimated_rows,
-			obj_description(c.oid,'pg_class') as remarks
-		from pg_class c
-		join pg_namespace n
-		  on n.oid = c.relnamespace
-		where c.relkind in ('r','p','v','m','f')
-		order by
-			case n.nspname
-				when 'pg_catalog' then 9
-				when 'information_schema' then 8
-				else 0
-			end,
-			case c.relkind
-				when 'r' then 0
-				when 'p' then 1
-				else 9
-			end,
-			n.nspname,
-			c.relname`,
+	Usage:             "sqlbless postgres://<USERNAME>:<PASSWORD>@<HOSTNAME>:<PORT>/<DBNAME>?sslmode=disable",
+	SQLForColumns:     columnsSql,
+	SQLForTables:      tablesSql,
 	TypeConverterFor:  postgresTypeNameToConv,
 	PlaceHolder:       &placeHolder{},
 	TableNameField:    "full_name",

dialect/postgresql/tables.sql

@@ -0,0 +1,29 @@
+select  n.nspname || '.' || c.relname as full_name,
+        n.nspname as table_schema,
+        c.relname as table_name,
+        case c.relkind
+            when 'r' then 'BASE TABLE'
+            when 'p' then 'PARTITIONED TABLE'
+            when 'v' then 'VIEW'
+            when 'm' then 'MATERIALIZED VIEW'
+            when 'f' then 'FOREIGN TABLE'
+        end as table_type,
+        c.reltuples::bigint as estimated_rows,
+        obj_description(c.oid,'pg_class') as remarks
+  from  pg_class c
+  join  pg_namespace n
+    on  n.oid = c.relnamespace
+ where  c.relkind in ('r','p','v','m','f')
+ order  by
+        case n.nspname
+            when 'pg_catalog' then 9
+            when 'information_schema' then 8
+            else 0
+        end,
+        case c.relkind
+            when 'r' then 0
+            when 'p' then 1
+            else 9
+        end,
+        n.nspname,
+        c.relname