fix tests on older versions of postgres

Author: brianc

test/integration/connection-pool/error-tests.js

@@ -13,10 +13,12 @@ pg.connect(helper.config, assert.success(function(client, done) {
       client2.id = 2;
       var pidColName = 'procpid'
       helper.versionGTE(client2, '9.2.0', assert.success(function(isGreater) {
-        if(isGreater) {
-          pidColName = 'pid';
+        var killIdleQuery = 'SELECT pid, (SELECT pg_terminate_backend(pid)) AS killed FROM pg_stat_activity WHERE state = $1';
+        var params = ['idle'];
+        if(!isGreater) {
+          killIdleQuery = 'SELECT procpid, (SELECT pg_terminate_backend(procpid)) AS killed FROM pg_stat_activity WHERE current_query LIKE $1';
+          params = ['%IDLE%']
         }
-        var killIdleQuery = 'SELECT ' + pidColName + ', (SELECT pg_terminate_backend(' + pidColName + ')) AS killed FROM pg_stat_activity WHERE state = $1';
         done2();
         //subscribe to the pg error event
         assert.emits(pg, 'error', function(error, brokenClient) {
@@ -25,7 +27,7 @@ pg.connect(helper.config, assert.success(function(client, done) {
           assert.equal(client.id, brokenClient.id);
         });
         //kill the connection from client
-        client2.query(killIdleQuery, ['idle'], assert.success(function(res) {
+        client2.query(killIdleQuery, params, assert.success(function(res) {
           //check to make sure client connection actually was killed
           assert.lengthIs(res.rows, 1);
           pg.end();