diff --git a/apps/emqx_authn/src/simple_authn/emqx_authn_pgsql.erl b/apps/emqx_authn/src/simple_authn/emqx_authn_pgsql.erl
index f431178bc..6589fc8eb 100644
--- a/apps/emqx_authn/src/simple_authn/emqx_authn_pgsql.erl
+++ b/apps/emqx_authn/src/simple_authn/emqx_authn_pgsql.erl
@@ -76,11 +76,10 @@ create(#{query := Query0,
     ok = emqx_authn_password_hashing:init(Algorithm),
     {Query, PlaceHolders} = parse_query(Query0),
     ResourceId = emqx_authn_utils:make_resource_id(?MODULE),
-    State = #{query => Query,
-              placeholders => PlaceHolders,
+    State = #{placeholders => PlaceHolders,
               password_hash_algorithm => Algorithm,
               resource_id => ResourceId},
-    case emqx_resource:create_local(ResourceId, emqx_connector_pgsql, Config) of
+    case emqx_resource:create_local(ResourceId, emqx_connector_pgsql, Config#{named_queries => #{ResourceId => Query}}) of
         {ok, already_created} ->
             {ok, State};
         {ok, _} ->
@@ -101,12 +100,11 @@ update(Config, State) ->
 authenticate(#{auth_method := _}, _) ->
     ignore;
 authenticate(#{password := Password} = Credential,
-             #{query := Query,
-               placeholders := PlaceHolders,
+             #{placeholders := PlaceHolders,
                resource_id := ResourceId,
                password_hash_algorithm := Algorithm}) ->
     Params = emqx_authn_utils:replace_placeholders(PlaceHolders, Credential),
-    case emqx_resource:query(ResourceId, {prepared_query, ResourceId, Query, Params}) of
+    case emqx_resource:query(ResourceId, {prepared_query, ResourceId, Params}) of
         {ok, _Columns, []} -> ignore;
         {ok, Columns, [Row | _]} ->
             NColumns = [Name || #column{name = Name} <- Columns],
@@ -133,7 +131,6 @@ destroy(#{resource_id := ResourceId}) ->
 %% Internal functions
 %%------------------------------------------------------------------------------
 
-%% TODO: Support prepare
 parse_query(Query) ->
     case re:run(Query, ?RE_PLACEHOLDER, [global, {capture, all, binary}]) of
         {match, Captured} ->
diff --git a/apps/emqx_authn/test/emqx_authn_pgsql_SUITE.erl b/apps/emqx_authn/test/emqx_authn_pgsql_SUITE.erl
index bfccaf128..a2c95314d 100644
--- a/apps/emqx_authn/test/emqx_authn_pgsql_SUITE.erl
+++ b/apps/emqx_authn/test/emqx_authn_pgsql_SUITE.erl
@@ -31,10 +31,10 @@
 -define(PATH, [authentication]).
 
 all() ->
-    [{group, require_seeds}, t_create, t_create_invalid, t_parse_query].
+    [{group, require_seeds}, t_create_invalid, t_parse_query].
 
 groups() ->
-    [{require_seeds, [], [t_authenticate, t_update, t_destroy, t_is_superuser]}].
+    [{require_seeds, [], [t_create, t_authenticate, t_update, t_destroy, t_is_superuser]}].
 
 init_per_testcase(_, Config) ->
     {ok, _} = emqx_cluster_rpc:start_link(node(), emqx_cluster_rpc, 1000),
@@ -171,7 +171,7 @@ t_update(_Config) ->
     IncorrectConfig =
         CorrectConfig#{
             query => <<"SELECT password_hash, salt, is_superuser_str as is_superuser
-                          FROM wrong_table where username = ${username} LIMIT 1">>},
+                          FROM users where username = ${username} LIMIT 0">>},
 
     {ok, _} = emqx:update_config(
                 ?PATH,
diff --git a/apps/emqx_authn/test/emqx_authn_pgsql_tls_SUITE.erl b/apps/emqx_authn/test/emqx_authn_pgsql_tls_SUITE.erl
index 51a1ce8dd..0225ed06f 100644
--- a/apps/emqx_authn/test/emqx_authn_pgsql_tls_SUITE.erl
+++ b/apps/emqx_authn/test/emqx_authn_pgsql_tls_SUITE.erl
@@ -125,8 +125,7 @@ raw_pgsql_auth_config(SpecificSSLOpts) ->
       username => <<"root">>,
       password => <<"public">>,
 
-      query => <<"SELECT password_hash, salt, is_superuser_str as is_superuser
-                      FROM users where username = ${username} LIMIT 1">>,
+      query => <<"SELECT 1">>,
       server => pgsql_server(),
       ssl => maps:merge(SSLOpts, SpecificSSLOpts)
      }.
diff --git a/apps/emqx_authz/src/emqx_authz_postgresql.erl b/apps/emqx_authz/src/emqx_authz_postgresql.erl
index d93d5447c..cfd58c53f 100644
--- a/apps/emqx_authz/src/emqx_authz_postgresql.erl
+++ b/apps/emqx_authz/src/emqx_authz_postgresql.erl
@@ -39,12 +39,19 @@
 description() ->
     "AuthZ with Postgresql".
 
-init(#{query := SQL} = Source) ->
-    case emqx_authz_utils:create_resource(emqx_connector_pgsql, Source) of
-        {error, Reason} -> error({load_config_error, Reason});
-        {ok, Id} -> Source#{annotations =>
-                            #{id => Id,
-                              query => parse_query(SQL)}}
+init(#{query := SQL0} = Source) ->
+    {SQL, PlaceHolders} = parse_query(SQL0),
+    ResourceID = emqx_authz_utils:make_resource_id(emqx_connector_pgsql),
+    case emqx_resource:create_local(
+            ResourceID,
+            emqx_connector_pgsql,
+            Source#{named_queries => #{ResourceID => SQL}}) of
+        {ok, _} ->
+            Source#{annotations =>
+                        #{id => ResourceID,
+                          placeholders => PlaceHolders}};
+        {error, Reason} ->
+            error({load_config_error, Reason})
     end.
 
 destroy(#{annotations := #{id := Id}}) ->
@@ -70,10 +77,10 @@ parse_query(Sql) ->
 
 authorize(Client, PubSub, Topic,
             #{annotations := #{id := ResourceID,
-                               query := {Query, Params}
+                               placeholders := Placeholders
                               }
              }) ->
-    case emqx_resource:query(ResourceID, {prepared_query, ResourceID, Query, replvar(Params, Client)}) of
+    case emqx_resource:query(ResourceID, {prepared_query, ResourceID, replvar(Placeholders, Client)}) of
         {ok, _Columns, []} -> nomatch;
         {ok, Columns, Rows} ->
             do_authorize(Client, PubSub, Topic, Columns, Rows);
diff --git a/apps/emqx_authz/test/emqx_authz_postgresql_SUITE.erl b/apps/emqx_authz/test/emqx_authz_postgresql_SUITE.erl
index 6ececd3f8..45745326d 100644
--- a/apps/emqx_authz/test/emqx_authz_postgresql_SUITE.erl
+++ b/apps/emqx_authz/test/emqx_authz_postgresql_SUITE.erl
@@ -168,7 +168,8 @@ t_pgsql_error(_Config) ->
                   },
 
     ok = setup_config(
-      #{<<"query">> => <<"SOME INVALID STATEMENT">>}),
+      #{<<"query">> => <<"SELECT permission, action, topic "
+                         "FROM acl WHERE clientid = ${username}">>}),
 
     ok = emqx_authz_test_lib:test_samples(
            ClientInfo,
diff --git a/apps/emqx_authz/test/emqx_authz_test_lib.erl b/apps/emqx_authz/test/emqx_authz_test_lib.erl
index bacbbe10a..b7de5c3da 100644
--- a/apps/emqx_authz/test/emqx_authz_test_lib.erl
+++ b/apps/emqx_authz/test/emqx_authz_test_lib.erl
@@ -40,8 +40,10 @@ reset_authorizers(Nomatch, ChacheEnabled) ->
 
 setup_config(BaseConfig, SpecialParams) ->
     Config = maps:merge(BaseConfig, SpecialParams),
-    {ok, _} = emqx_authz:update(?CMD_REPLACE, [Config]),
-    ok.
+    case emqx_authz:update(?CMD_REPLACE, [Config]) of
+      {ok, _} -> ok;
+      {error, Reason} -> {error, Reason}
+    end.
 
 is_tcp_server_available(Host, Port) ->
     case gen_tcp:connect(Host, Port, [], ?DEFAULT_CHECK_AVAIL_TIMEOUT) of
diff --git a/apps/emqx_connector/rebar.config b/apps/emqx_connector/rebar.config
index 1865f8f49..a5d453287 100644
--- a/apps/emqx_connector/rebar.config
+++ b/apps/emqx_connector/rebar.config
@@ -9,7 +9,7 @@
   {emqx, {path, "../emqx"}},
   {eldap2, {git, "https://github.com/emqx/eldap2", {tag, "v0.2.2"}}},
   {mysql, {git, "https://github.com/emqx/mysql-otp", {tag, "1.7.1"}}},
-  {epgsql, {git, "https://github.com/emqx/epgsql", {tag, "4.7-emqx.1"}}},
+  {epgsql, {git, "https://github.com/emqx/epgsql", {tag, "4.7-emqx.2"}}},
   %% NOTE: mind poolboy version when updating mongodb-erlang version
   {mongodb, {git,"https://github.com/emqx/mongodb-erlang", {tag, "v3.0.11"}}},
   %% NOTE: mind poolboy version when updating eredis_cluster version
diff --git a/apps/emqx_connector/src/emqx_connector_pgsql.erl b/apps/emqx_connector/src/emqx_connector_pgsql.erl
index 0dcddcc68..90d1c207e 100644
--- a/apps/emqx_connector/src/emqx_connector_pgsql.erl
+++ b/apps/emqx_connector/src/emqx_connector_pgsql.erl
@@ -17,6 +17,7 @@
 
 -include_lib("typerefl/include/types.hrl").
 -include_lib("emqx/include/logger.hrl").
+-include_lib("epgsql/include/epgsql.hrl").
 
 -export([roots/0, fields/1]).
 
@@ -33,7 +34,7 @@
 -export([connect/1]).
 
 -export([ query/3
-        , prepared_query/4
+        , prepared_query/3
         ]).
 
 -export([do_health_check/1]).
@@ -44,12 +45,17 @@ roots() ->
     [{config, #{type => hoconsc:ref(?MODULE, config)}}].
 
 fields(config) ->
+    [{named_queries, fun named_queries/1}] ++
     emqx_connector_schema_lib:relational_db_fields() ++
     emqx_connector_schema_lib:ssl_fields().
 
 on_jsonify(#{server := Server}= Config) ->
     Config#{server => emqx_connector_schema_lib:ip_port_to_string(Server)}.
 
+named_queries(type) -> map();
+named_queries(nullable) -> true;
+named_queries(_) -> undefined.
+
 %% ===================================================================
 on_start(InstId, #{server := {Host, Port},
                    database := DB,
@@ -57,7 +63,7 @@ on_start(InstId, #{server := {Host, Port},
                    password := Password,
                    auto_reconnect := AutoReconn,
                    pool_size := PoolSize,
-                   ssl := SSL } = Config) ->
+                   ssl := SSL} = Config) ->
     ?SLOG(info, #{msg => "starting_postgresql_connector",
                   connector => InstId, config => Config}),
     SslOpts = case maps:get(enable, SSL) of
@@ -74,7 +80,8 @@ on_start(InstId, #{server := {Host, Port},
                {password, Password},
                {database, DB},
                {auto_reconnect, reconn_interval(AutoReconn)},
-               {pool_size, PoolSize}],
+               {pool_size, PoolSize},
+               {named_queries, maps:to_list(maps:get(named_queries, Config, #{}))}],
     PoolName = emqx_plugin_libs_pool:pool_name(InstId),
     _ = emqx_plugin_libs_pool:start_pool(PoolName, ?MODULE, Options ++ SslOpts),
     {ok, #{poolname => PoolName}}.
@@ -84,20 +91,17 @@ on_stop(InstId, #{poolname := PoolName}) ->
                   connector => InstId}),
     emqx_plugin_libs_pool:stop_pool(PoolName).
 
-on_query(InstId, QueryParams, AfterQuery, #{poolname := PoolName} = State) ->
-    {Command, Args} = case QueryParams of
-                          {query, SQL} -> {query, [SQL, []]};
-                          {query, SQL, Params} -> {query, [SQL, Params]};
-                          {prepared_query, Name, SQL} -> {prepared_query, [Name, SQL, []]};
-                          {prepared_query, Name, SQL, Params} -> {prepared_query, [Name, SQL, Params]}
-                      end,
-    ?TRACE("QUERY", "postgresql_connector_received",
-        #{connector => InstId, command => Command, args => Args, state => State}),
-    case Result = ecpool:pick_and_do(PoolName, {?MODULE, Command, Args}, no_handover) of
+on_query(InstId, {Type, NameOrSQL}, AfterQuery, #{poolname := _PoolName} = State) ->
+    on_query(InstId, {Type, NameOrSQL, []}, AfterQuery, State);
+
+on_query(InstId, {Type, NameOrSQL, Params}, AfterQuery, #{poolname := PoolName} = State) ->
+    ?SLOG(debug, #{msg => "postgresql connector received sql query",
+        connector => InstId, sql => NameOrSQL, state => State}),
+    case Result = ecpool:pick_and_do(PoolName, {?MODULE, Type, [NameOrSQL, Params]}, no_handover) of
         {error, Reason} ->
             ?SLOG(error, #{
-                msg => "postgresql_connector_do_sql_query_failed",
-                connector => InstId, sql => SQL, reason => Reason}),
+                msg => "postgresql connector do sql query failed",
+                connector => InstId, sql => NameOrSQL, reason => Reason}),
             emqx_resource:query_failed(AfterQuery);
         _ ->
             emqx_resource:query_success(AfterQuery)
@@ -118,13 +122,32 @@ connect(Opts) ->
     Host     = proplists:get_value(host, Opts),
     Username = proplists:get_value(username, Opts),
     Password = proplists:get_value(password, Opts),
-    epgsql:connect(Host, Username, Password, conn_opts(Opts)).
+    NamedQueries = proplists:get_value(named_queries, Opts),
+    case epgsql:connect(Host, Username, Password, conn_opts(Opts)) of
+        {ok, Conn} ->
+            case parse(Conn, NamedQueries) of
+                ok -> {ok, Conn};
+                {error, Reason} -> {error, Reason}
+            end;
+        {error, Reason} ->
+            {error, Reason}
+    end.
 
 query(Conn, SQL, Params) ->
     epgsql:equery(Conn, SQL, Params).
 
-prepared_query(Conn, Name, SQL, Params) ->
-    epgsql:prepared_query2(Conn, Name, SQL, Params).
+prepared_query(Conn, Name, Params) ->
+    epgsql:prepared_query2(Conn, Name, Params).
+
+parse(_Conn, []) ->
+    ok;
+parse(Conn, [{Name, Query} | More]) ->
+    case epgsql:parse2(Conn, Name, Query, []) of
+        {ok, _Statement} ->
+            parse(Conn, More);
+        Other ->
+            Other
+    end.
 
 conn_opts(Opts) ->
     conn_opts(Opts, []).
diff --git a/mix.exs b/mix.exs
index ca66f0c6d..aa0aa9d31 100644
--- a/mix.exs
+++ b/mix.exs
@@ -73,7 +73,7 @@ defmodule EMQXUmbrella.MixProject do
       # in conflict by ehttpc and emqtt
       {:gun, github: "emqx/gun", tag: "1.3.6", override: true},
       # in conflict by emqx_connectior and system_monitor
-      {:epgsql, github: "emqx/epgsql", tag: "4.7-emqx.1", override: true},
+      {:epgsql, github: "emqx/epgsql", tag: "4.7-emqx.2", override: true},
       # in conflict by mongodb and eredis_cluster
       {:poolboy, github: "emqx/poolboy", tag: "1.5.2", override: true},
       # in conflict by emqx and observer_cli