add PGExceptionSorter

src/main/java/com/alibaba/druid/pool/DruidDataSource.java

@@ -69,6 +69,7 @@ import com.alibaba.druid.pool.vendor.MySqlExceptionSorter;
 import com.alibaba.druid.pool.vendor.MySqlValidConnectionChecker;
 import com.alibaba.druid.pool.vendor.OracleExceptionSorter;
 import com.alibaba.druid.pool.vendor.OracleValidConnectionChecker;
+import com.alibaba.druid.pool.vendor.PGExceptionSorter;
 import com.alibaba.druid.pool.vendor.SybaseExceptionSorter;
 import com.alibaba.druid.proxy.DruidDriver;
 import com.alibaba.druid.proxy.jdbc.DataSourceProxyConfig;
@@ -911,6 +912,9 @@ public class DruidDataSource extends DruidAbstractDataSource
         } else if (realDriverClassName.equals("com.sybase.jdbc2.jdbc.SybDriver")) {
             this.exceptionSorter = new SybaseExceptionSorter();
 
+        } else if (realDriverClassName.equals("org.postgresql.Driver")) {
+            this.exceptionSorter = new PGExceptionSorter();
+            
         } else if (realDriverClassName.equals("com.alibaba.druid.mock.MockDriver")) {
             this.exceptionSorter = new MockExceptionSorter();
         } else if (realDriverClassName.contains("DB2")) {

src/main/java/com/alibaba/druid/pool/vendor/PGExceptionSorter.java

@@ -0,0 +1,30 @@
+package com.alibaba.druid.pool.vendor;
+
+import java.sql.SQLException;
+import java.util.Properties;
+
+import com.alibaba.druid.pool.ExceptionSorter;
+
+public class PGExceptionSorter implements ExceptionSorter {
+
+    @Override
+    public boolean isExceptionFatal(SQLException e) {
+        String sqlState = e.getSQLState();
+        if (sqlState == null) {
+            return false;
+        }
+        
+        // org.postgresql.util.PSQLState
+        if (sqlState.startsWith("08")) {
+            return true;
+        }
+        
+        return false;
+    }
+
+    @Override
+    public void configFromProperties(Properties properties) {
+
+    }
+
+}