diff --git a/sqlor/mssqlor.py b/sqlor/mssqlor.py
index 31b8bf5..25edad8 100755
--- a/sqlor/mssqlor.py
+++ b/sqlor/mssqlor.py
@@ -51,7 +51,7 @@ class MsSqlor(SQLor):
 			'select':select_stmt,
 		}
 		
-	def placeHolder(self,varname):
+	def placeHolder(self,varname,pos=None):
 		if varname=='__mainsql__' :
 			return ''
 		return '%s'
diff --git a/sqlor/mysqlor.py b/sqlor/mysqlor.py
index 58360f8..d68b621 100755
--- a/sqlor/mysqlor.py
+++ b/sqlor/mysqlor.py
@@ -64,7 +64,7 @@ class MySqlor(SQLor):
 	def _opendb(self):
 		self.conn = connector.connect(**self.dbdesc['kwargs'])
 		
-	def placeHolder(self,varname):
+	def placeHolder(self,varname,pos=None):
 		if varname=='__mainsql__' :
 			return ''
 		return '%s'
@@ -119,7 +119,7 @@ limit $[from_line]$,$[rows]$"""
 	case when character_maximum_length is null then  NUMERIC_PRECISION
 		else character_maximum_length end
 	as length,
-	NUMERIC_SCALE as dec1,
+	NUMERIC_SCALE as 'dec',
 	lower(is_nullable) as nullable,
 	column_comment as title,
 	lower(table_name) as table_name
@@ -160,7 +160,10 @@ limit $[from_line]$,$[rows]$"""
 	def indexesSQL(self,tablename=None):
 		sqlcmd = """SELECT DISTINCT
     lower(index_name) as index_name,
-	NON_UNIQUE as is_unique,
+	case NON_UNIQUE
+		when 1 then 'unique'
+	else ''
+	end as is_unique,
 	lower(column_name) as column_name
 FROM
     information_schema.statistics
diff --git a/sqlor/oracleor.py b/sqlor/oracleor.py
index 0646943..b7d30ee 100755
--- a/sqlor/oracleor.py
+++ b/sqlor/oracleor.py
@@ -45,7 +45,7 @@ class Oracleor(SQLor):
 			'select':select_stmt,
 		}
 		
-	def placeHolder(self,varname):
+	def placeHolder(self,varname,pos=None):
 		if varname=='__mainsql__' :
 			return ''
 		return ':%s' % varname
diff --git a/sqlor/postgresqlor.py b/sqlor/postgresqlor.py
index a606737..15895c1 100755
--- a/sqlor/postgresqlor.py
+++ b/sqlor/postgresqlor.py
@@ -45,17 +45,16 @@ class PostgreSQLor(SQLor):
 			'select':select_stmt,
 		}
 		
-	def placeHolder(self,varname):
+	def placeHolder(self,varname,i):
 		if varname=='__mainsql__' :
 			return ''
-		return ':%s' % varname
+		return '$%d' % i
 	
 	def dataConvert(self,dataList):
-		if type(dataList) == type({}):
-			return dataList
-		d = {}
-		[ d.update({i['name']:i['value']}) for i in dataList ]
-		return d
+		x = super().dataConvert(dataList)
+		if x == []:
+			return None
+		return x
 
 	def pagingSQLmodel(self):
 		return u"""select * 
@@ -71,7 +70,7 @@ where row_id >=$[from_line]$ and row_id < $[end_line]$"""
 from 
 (select a.name,c.oid
 	from
-	(select lower(tablename) as name from tables where schemaname='public') a
+	(select lower(tablename) as name from pg_tables where schemaname='public') a,
 	pg_class c
 where a.name = c.relname) x
 left join pg_description y
@@ -89,13 +88,13 @@ on x.oid=y.objoid
 		else null
 	end as length,
 	case t.typname
-		when 'numeric' then (a.atttypmod - 4) % 65536
+		when 'numeric' then (a.atttypmod - 4) %% 65536
 		else null
 	end as dec,
     case a.attnotnull
 		when 't' then 'no'
 		when 'f' then 'yes'
-	end as nullable
+	end as nullable,
 	b.description AS title
 FROM pg_class c, pg_attribute a
     LEFT JOIN pg_description b
@@ -168,7 +167,5 @@ where
 order by
     t.relname,
     i.relname""" % tablename.lower()
-		if tablename is not None:
-			sqlcmd += """  and lower(a.table_name) = lower('%s')"""  % tablename.lower()
 		return sqlcmd
 		
diff --git a/sqlor/sor.py b/sqlor/sor.py
index 9558f28..f8cda6c 100755
--- a/sqlor/sor.py
+++ b/sqlor/sor.py
@@ -67,6 +67,34 @@ class SQLor(object):
 		self.dataChanged = False
 		self.metadatas={}
 
+	async def get_schema(self):
+		def concat_idx_info(idxs):
+			x = []
+			n = None
+			for i in idxs:
+				if not n or n.index_name != i.index_name:
+					if n:
+						x.append(n)
+					n = i
+					n.column_name = [i.column_name]
+				else:
+					n.column_name.append(i.column_name)
+			return x
+
+		tabs = await self.tables()
+		schemas = []
+		for t in tabs:
+			primary = await self.primary(t.name)
+			indexes = concat_idx_info(await self.indexes(t.name))
+			fields = await self.fields(t.name)
+			t.primary = [f.field_name for f in primary]
+			x = {}
+			x['summary'] = [t]
+			x['indexes'] = indexes
+			x['fields'] = fields
+			schemas.append(x)
+		return schemas
+
 	def setMeta(self,tablename,meta):
 		self.metadatas[tablename.lower()] = meta
 
@@ -99,7 +127,7 @@ class SQLor(object):
 	def pagingSQLmodel(self):
 		return u""
 		
-	def placeHolder(self,varname):
+	def placeHolder(self,varname,pos=None):
 		if varname=='__mainsql__' :
 			return ''
 		return '?'
@@ -200,7 +228,7 @@ class SQLor(object):
 		sql1 = cc.convert(sql1,NS)
 		vars = sqlargsAC.findAllVariables(sql1)
 		phnamespace = {}
-		[phnamespace.update({v:self.placeHolder(v)}) for v in vars]
+		[phnamespace.update({v:self.placeHolder(v,i)}) for v,i in enumerate(vars)]
 		m_sql = sqlargsAC.convert(sql1,phnamespace)
 		newdata = []
 		for v in vars:
diff --git a/sqlor/sqlite3or.py b/sqlor/sqlite3or.py
index 5283012..9d96c8f 100755
--- a/sqlor/sqlite3or.py
+++ b/sqlor/sqlite3or.py
@@ -33,7 +33,7 @@ class SQLite3or(SQLor):
 	def isMe(self,name):
 		return name=='sqlite3'
 			
-	def placeHolder(self,varname):
+	def placeHolder(self,varname,pos=None):
 		if varname=='__mainsql__' :
 			return ''
 		return '?'