pgsql DbFirst 完成未测试；oracle 适配进行中

FreeSql.Tests/PostgreSQL/PostgreSQLDbFirstTest.cs

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+using FreeSql.DataAnnotations;
+using System;
+using Xunit;
+
+namespace FreeSql.Tests.PostgreSQL {
+	public class PostgreSQLDbFirstTest {
+		[Fact]
+		public void GetDatabases() {
+
+			var t1 = g.pgsql.DbFirst.GetDatabases();
+
+		}
+
+		[Fact]
+		public void GetTablesByDatabase() {
+
+			var t2 = g.pgsql.DbFirst.GetTablesByDatabase(g.pgsql.DbFirst.GetDatabases()[1]);
+
+		}
+	}
+}