Added ERD Diagram support with basic table fields, primary key, foreign key, and DDL SQL generation. Fixes #1802

web/pgadmin/tools/erd/tests/sql/12_plus/test_sql_output.sql

@@ -0,0 +1,25 @@
+
+
+CREATE TABLE public.newtable1
+(
+    id integer,
+    col1 character varying(50),
+    PRIMARY KEY (id)
+);
+
+CREATE TABLE public.newtable2
+(
+    table1_id integer,
+    col2 character varying(50),
+    PRIMARY KEY (id)
+);
+
+CREATE TABLE public.newtable3
+(
+)
+;
+
+ALTER TABLE public.newtable2
+    ADD FOREIGN KEY (table1_id)
+    REFERENCES public.newtable1 (id)
+    NOT VALID;

web/pgadmin/tools/erd/tests/sql/default/test_sql_output.sql

@@ -0,0 +1,34 @@
+
+
+CREATE TABLE public.newtable1
+(
+    id integer,
+    col1 character varying(50),
+    PRIMARY KEY (id)
+)
+WITH (
+    OIDS = FALSE
+);
+
+CREATE TABLE public.newtable2
+(
+    table1_id integer,
+    col2 character varying(50),
+    PRIMARY KEY (id)
+)
+WITH (
+    OIDS = FALSE
+);
+
+CREATE TABLE public.newtable3
+(
+)
+
+WITH (
+    OIDS = FALSE
+);
+
+ALTER TABLE public.newtable2
+    ADD FOREIGN KEY (table1_id)
+    REFERENCES public.newtable1 (id)
+    NOT VALID;