Some stuff I had on another machine and which might provide useful.

pglab/CreateDatabaseDialog.cpp

@@ -0,0 +1,14 @@
+#include "CreateDatabaseDialog.h"
+#include "ui_CreateDatabaseDialog.h"
+
+CreateDatabaseDialog::CreateDatabaseDialog(QWidget *parent) :
+    QDialog(parent),
+    ui(new Ui::CreateDatabaseDialog)
+{
+    ui->setupUi(this);
+}
+
+CreateDatabaseDialog::~CreateDatabaseDialog()
+{
+    delete ui;
+}

pglab/CreateDatabaseDialog.h

@@ -0,0 +1,22 @@
+#ifndef CREATEDATABASEDIALOG_H
+#define CREATEDATABASEDIALOG_H
+
+#include <QDialog>
+
+namespace Ui {
+class CreateDatabaseDialog;
+}
+
+class CreateDatabaseDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit CreateDatabaseDialog(QWidget *parent = 0);
+    ~CreateDatabaseDialog();
+
+private:
+    Ui::CreateDatabaseDialog *ui;
+};
+
+#endif // CREATEDATABASEDIALOG_H

pglab/CreateDatabaseDialog.ui

@@ -0,0 +1,162 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>CreateDatabaseDialog</class>
+ <widget class="QDialog" name="CreateDatabaseDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>506</width>
+    <height>371</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Dialog</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <layout class="QFormLayout" name="formLayout">
+     <item row="0" column="0">
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>Name</string>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="1">
+      <widget class="QLineEdit" name="lineEdit"/>
+     </item>
+     <item row="1" column="0">
+      <widget class="QLabel" name="label_2">
+       <property name="text">
+        <string>Template</string>
+       </property>
+      </widget>
+     </item>
+     <item row="1" column="1">
+      <widget class="QComboBox" name="comboBox"/>
+     </item>
+     <item row="2" column="0">
+      <widget class="QLabel" name="label_3">
+       <property name="text">
+        <string>Encoding</string>
+       </property>
+      </widget>
+     </item>
+     <item row="2" column="1">
+      <widget class="QComboBox" name="comboBox_2"/>
+     </item>
+     <item row="3" column="0">
+      <widget class="QLabel" name="label_4">
+       <property name="text">
+        <string>Collation order</string>
+       </property>
+      </widget>
+     </item>
+     <item row="3" column="1">
+      <widget class="QComboBox" name="comboBox_3"/>
+     </item>
+     <item row="4" column="0">
+      <widget class="QLabel" name="label_5">
+       <property name="text">
+        <string>Character classification</string>
+       </property>
+      </widget>
+     </item>
+     <item row="4" column="1">
+      <widget class="QComboBox" name="comboBox_4"/>
+     </item>
+     <item row="5" column="0">
+      <widget class="QLabel" name="label_6">
+       <property name="text">
+        <string>Connection limit</string>
+       </property>
+      </widget>
+     </item>
+     <item row="5" column="1">
+      <widget class="QSpinBox" name="spinBox"/>
+     </item>
+     <item row="6" column="0">
+      <widget class="QLabel" name="label_8">
+       <property name="text">
+        <string>Tablespace</string>
+       </property>
+      </widget>
+     </item>
+     <item row="6" column="1">
+      <widget class="QComboBox" name="comboBox_5"/>
+     </item>
+     <item row="7" column="0">
+      <widget class="QLabel" name="label_7">
+       <property name="text">
+        <string>Owner</string>
+       </property>
+      </widget>
+     </item>
+     <item row="7" column="1">
+      <widget class="QComboBox" name="comboBox_6"/>
+     </item>
+     <item row="8" column="0">
+      <widget class="QCheckBox" name="checkBox">
+       <property name="text">
+        <string>Template database</string>
+       </property>
+      </widget>
+     </item>
+     <item row="9" column="0">
+      <widget class="QCheckBox" name="checkBox_2">
+       <property name="text">
+        <string>Allow connections</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>CreateDatabaseDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>CreateDatabaseDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

pglab/OpenDatabase.cpp

@@ -32,7 +32,7 @@ bool OpenDatabase::Init()
 	auto kw = m_config.getKeywords();
 	auto vals = m_config.getValues();
 	if (conn.connect(kw, vals, 0)) {
-		m_catalogue->loadAll(conn);
+		m_catalogue->loadAll(conn, nullptr);
         return true;
 	}
 	return false;

pglab/PgDatabaseCatalog.cpp

@@ -1,5 +1,6 @@
 #include "PgDatabaseCatalog.h"
 
+#include "ASyncDBConnection.h"
 #include "PgAttributeContainer.h"
 #include "PgAuthIdContainer.h"
 #include "PgClassContainer.h"
@@ -11,6 +12,8 @@
 #include "Pgsql_Connection.h"
 #include "Pgsql_oids.h"
 
+#include <QThread>
+
 using namespace Pgsql;
 
 QString getRoleNameFromOid(const PgDatabaseCatalog &cat, Oid oid)
@@ -100,17 +103,35 @@ PgDatabaseCatalog::~PgDatabaseCatalog()
 {
 }
 
-void PgDatabaseCatalog::loadAll(Pgsql::Connection &conn)
+void PgDatabaseCatalog::loadAll(Pgsql::Connection &conn,
+								std::function<bool(int, int)> progress_callback)
 {
 	loadInfo(conn);
+	if (progress_callback && !progress_callback(1, 9))
+		return;
 	load2(m_attributes, conn);
+	if (progress_callback && !progress_callback(2, 9))
+		return;
 	load2(m_authIds, conn);
+	if (progress_callback && !progress_callback(3, 9))
+		return;
 	load2(m_classes, conn);
+	if (progress_callback && !progress_callback(4, 9))
+		return;
 	load2(m_constraints, conn);
+	if (progress_callback && !progress_callback(5, 9))
+		return;
 	load2(m_databases, conn);
+	if (progress_callback && !progress_callback(6, 9))
+		return;
 	load2(m_indexes, conn);
+	if (progress_callback && !progress_callback(7, 9))
+		return;
 	load2(m_namespaces, conn);
+	if (progress_callback && !progress_callback(8, 9))
+		return;
 	load2(m_types, conn);
+	progress_callback && progress_callback(9, 9);
 }
 
 void PgDatabaseCatalog::loadInfo(Pgsql::Connection &conn)
@@ -128,6 +149,7 @@ void PgDatabaseCatalog::loadInfo(Pgsql::Connection &conn)
 
 void load(Pgsql::Connection &conn, IPgContainter &pg_cont)
 {
+	QThread::msleep(400);
 	std::string q = pg_cont.getLoadQuery();
 	Pgsql::Result result = conn.query(q.c_str());
 	if (result && result.resultStatus() == PGRES_TUPLES_OK)

pglab/PgDatabaseCatalog.h

@@ -3,6 +3,7 @@
 
 #include <libpq-fe.h>
 #include <QString>
+#include <functional>
 #include <memory>
 #include <vector>
 
@@ -26,22 +27,13 @@ public:
 	PgDatabaseCatalog();
 	PgDatabaseCatalog(const PgDatabaseCatalog&) = delete;
 	PgDatabaseCatalog& operator = (const PgDatabaseCatalog&) = delete;
-
 	~PgDatabaseCatalog();
 
+	void loadAll(Pgsql::Connection &conn,
+		std::function<bool(int, int)> progress_callback);
 
-	void loadAll(Pgsql::Connection &conn);
 	void loadInfo(Pgsql::Connection &conn);
 
-	//void loadAttributes(Pgsql::Connection &conn);
-//	void loadAuthIds(Pgsql::Connection &conn);
-//	void loadClasses(Pgsql::Connection &conn);
-//	void loadConstraints(Pgsql::Connection &conn);
-//	void loadDatabases(Pgsql::Connection &conn);
-//	void loadIndexes(Pgsql::Connection &conn);
-//	void loadNamespaces(Pgsql::Connection &conn);
-//	void loadTypes(Pgsql::Connection &conn);
-
 	const QString& serverVersionString() const;
 	int serverVersion() const;
 

pglab/pglab.pro

@@ -34,6 +34,7 @@ SOURCES += main.cpp\
     QueryExplainModel.cpp \
 	ASyncDBConnection.cpp \
     tsqueue.cpp \
+	CreateDatabaseDialog.cpp \
     DatabaseWindow.cpp \
 	ConnectionManagerWindow.cpp \
 	ConnectionListModel.cpp \
@@ -89,6 +90,7 @@ HEADERS  += \
     QueryExplainModel.h \
 	ASyncDBConnection.h \
     tsqueue.h \
+	CreateDatabaseDialog.h \
     DatabaseWindow.h \
 	ConnectionManagerWindow.h \
 	ConnectionListModel.h \
@@ -141,6 +143,7 @@ HEADERS  += \
 FORMS    += mainwindow.ui \
     DatabaseWindow.ui \
 	ConnectionManagerWindow.ui \
+	CreateDatabaseDialog.ui \
     DatabaseInspectorWidget.ui \
     TuplesResultWidget.ui \
     QueryTab.ui \

pgsql/Pgsql_PgException.cpp

@@ -0,0 +1 @@
+#include "Pgsql_PgException.h"

pgsql/Pgsql_PgException.h

@@ -0,0 +1,94 @@
+#ifndef PGEXCEPTION_H
+#define PGEXCEPTION_H
+
+#include <stdexcept>
+#include <utility>
+
+namespace Pgsql {
+
+    class PgException {
+    public:
+        PgException(const char *msg)
+            : message(msg)
+        {}
+        PgException(std::string msg)
+             : message(std::move(msg))
+        {}
+       
+        
+    private:
+        std::string message;
+        
+    };
+    
+    class PgResultError: public PgException {
+    public:
+        PgResultError(std::string msg, std::string result_code)
+            : PgException(std::move(msg))
+        {}
+    };
+    
+    class PgConnectionError: public PgResultError, std::runtime_error {
+        PgConnectionError(const std::string &msg, std::string result_code)
+            : PgResultError(msg, std::move(result_code))
+            , std::runtime_error(msg)
+        {}
+        
+    };
+    
+    
+ 
+/* postgresq error classes
+ *
+ * success
+ * warning
+ * no data
+ *
+ * 03 sql statement not yet  complete
+ * 08 connection exception -> could be resolved by reconnecting / resetting connection
+ * 09 triggered action exception
+ * 0A feature not supported
+ * 0B invalid transaction initiation
+ * 0F locator exception
+ * 0L invalid grantor
+ * 0P invalid role
+ * 0Z diagnostic exception
+ * 20 case not fount
+ * 21 cardinality violation
+ * 22 data exception
+ * 23 integrity constraint error
+ * 24 invalid cursor statement
+ * 25 invalid transaction state
+ * 26 invalid sql statement name
+ * 27 triggered data change violation
+ * 28 invalid authorization specification
+ * 2B Dependent Privilege Descriptors Still Exist
+ * 2D Invalid Transaction Termination
+ * 2F SQL Routine Exception
+ * 34 Invalid Cursor Name
+ * 38 External Routine Exception
+ * 39 External Routine Invocation Exception
+ * 3B Savepoint Exception
+ * 3D Invalid Catalog Name 
+ * 3F Invalid Schema Name
+ * 40 Transaction Rollback
+ * 42 Syntax Error or Access Rule Violation
+ * 44 WITH CHECK OPTION Violation
+ * 53 Insufficient Resources
+ * 54 Program Limit Exceeded
+ * 55 Object Not In Prerequisite State
+ * 57 Operator Intervention
+ * 58 System Error (errors external to PostgreSQL itself)
+ * 72 Snapshot Failure
+ * F0 Configuration File Error
+ * HV Foreign Data Wrapper Error (SQL/MED)
+ * P0 PL/pgSQL Error
+ * XX Internal Error
+ * 
+ * At what levels can the communication with postgresql fail
+ * - network -> reset/reconnecting
+ * - 
+ */
+}
+
+#endif // PGEXCEPTION_H

pgsql/pgsql.pro

@@ -34,6 +34,7 @@ release {
 
 SOURCES += Pgsql_Connection.cpp \
 	Pgsql_Params.cpp \
+	Pgsql_PgException.cpp \
     Pgsql_Result.cpp \
     Pgsql_Row.cpp \
     Pgsql_Value.cpp \ 
@@ -43,6 +44,7 @@ SOURCES += Pgsql_Connection.cpp \
 
 HEADERS  += Pgsql_Connection.h \
 	Pgsql_Params.h \
+	Pgsql_PgException.h \
     Pgsql_Result.h \
     Pgsql_Row.h \
     Pgsql_Value.h \