Fix compilation on less than postgres 9.0

PQEscapeLiteral was added in 9.0

Author: brianc

binding.gyp

@@ -1,4 +1,9 @@
 {
+  'target_defaults': {
+    'defines': [
+      '<!@(node ./src/config.js)'
+    ]
+  },
   'targets': [
     {
       'target_name': 'binding',

src/binding.cc

@@ -137,6 +137,10 @@ class Connection : public ObjectWrap {
   EscapeIdentifier(const Arguments& args)
   {
     HandleScope scope;
+#ifdef ESCAPE_NOT_SUPPORTED
+    THROW("Your version of libpq does not support PQEscapeIdentifier");
+#endif
+
     Connection *self = ObjectWrap::Unwrap<Connection>(args.This());
 
     char* inputStr = MallocCString(args[0]);
@@ -163,8 +167,13 @@ class Connection : public ObjectWrap {
   EscapeLiteral(const Arguments& args)
   {
     HandleScope scope;
+#ifdef ESCAPE_NOT_SUPPORTED
+    THROW("Your version of libpq does not support PQEscapeLiteral");
+#endif
     Connection *self = ObjectWrap::Unwrap<Connection>(args.This());
 
+
+
     char* inputStr = MallocCString(args[0]);
 
     if(!inputStr) {
@@ -364,13 +373,18 @@ class Connection : public ObjectWrap {
   char * EscapeIdentifier(const char *str)
   {
     TRACE("js::EscapeIdentifier")
+
+#ifndef ESCAPE_NOT_SUPPORTED
     return PQescapeIdentifier(connection_, str, strlen(str));
+#endif
   }
 
   char * EscapeLiteral(const char *str)
   {
     TRACE("js::EscapeLiteral")
+#ifndef ESCAPE_NOT_SUPPORTED
     return PQescapeLiteral(connection_, str, strlen(str));
+#endif
   }
 
   int Send(const char *queryText)

src/config.js

@@ -0,0 +1,8 @@
+var exec = require('child_process').exec;
+exec('pg_config --version', function(err, stdout) {
+  if(err) return err;
+  var majorVersion = stdout.split(' ')[1].split('.')[0];
+  if(parseInt(majorVersion) < 9) {
+    console.log('ESCAPE_NOT_SUPPORTED')
+  }
+});