Fix string escape problem with PostgreSQL >= 9.1 and standard_conform…

…ing_strings=on

fixes #9244

doc/2-getting-started.md

@@ -408,6 +408,7 @@ RHEL/CentOS 5/6:
 RHEL/CentOS 7:
 
     # yum install postgresql-server postgresql
+    # postgresql-setup --initdb
     # systemctl enable postgresql
     # systemctl start postgresql
 
@@ -471,7 +472,7 @@ authentication method and restart the postgresql server.
     # IPv6 local connections:
     host    all         all         ::1/128               ident
 
-    # /etc/init.d/postgresql restart
+    # service postgresql restart
 
 
 After creating the database and permissions you can import the Icinga 2 IDO

lib/db_ido_pgsql/idopgsqlconnection.cpp

@@ -217,8 +217,16 @@ void IdoPgsqlConnection::Reconnect(void)
 			BOOST_THROW_EXCEPTION(std::runtime_error(message));
 		}
 
+		IdoPgsqlResult result;
+
+		/* explicitely require legacy mode for string escaping in PostgreSQL >= 9.1
+		 * changing standard_conforming_strings to on by default
+		 */
+		if (PQserverVersion(m_Connection) >= 90100)
+			result = Query("SET standard_conforming_strings TO off");
+
 		String dbVersionName = "idoutils";
-		IdoPgsqlResult result = Query("SELECT version FROM " + GetTablePrefix() + "dbversion WHERE name=E'" + Escape(dbVersionName) + "'");
+		result = Query("SELECT version FROM " + GetTablePrefix() + "dbversion WHERE name=E'" + Escape(dbVersionName) + "'");
 
 		Dictionary::Ptr row = FetchRow(result, 0);