fix the way it gets column name for id property

lib/sql.js

@@ -421,17 +421,13 @@ SQLConnector.prototype.propertyName = function(model, column) {
 };
 
 /**
- * Get the id column name
+ * Get the id column name.
  * @param {String} model The model name
  * @returns {String} The id column name
  */
 SQLConnector.prototype.idColumn = function(model) {
-  let name = this.getDataSource(model).idColumnName(model);
-  const dbName = this.dbName;
-  if (typeof dbName === 'function') {
-    name = dbName(name);
-  }
-  return name;
+  const idName = this.getDataSource(model).getModelDefinition(model).idName();
+  return this.column(model, idName);
 };
 
 /**

test/sql.test.js

@@ -17,6 +17,7 @@ const ds = new juggler.DataSource({
 /* eslint-disable one-var */
 let connector;
 let Customer;
+let Order;
 /* eslint-enable one-var */
 
 describe('sql connector', function() {
@@ -58,6 +59,24 @@ describe('sql connector', function() {
         address: String,
       },
       {testdb: {table: 'CUSTOMER'}});
+    Order = ds.createModel('order',
+      {
+        id: {
+          id: true,
+          type: Number,
+          testdb: {
+            column: 'orderId',
+            dataType: 'INTEGER',
+          },
+        }, des: {
+          type: String,
+          name: 'des',
+          testdb: {
+            column: 'description',
+          },
+        },
+      },
+      {testdb: {table: 'ORDER'}});
   });
 
   it('should map table name', function() {
@@ -80,6 +99,12 @@ describe('sql connector', function() {
     expect(column).to.eql('LASTNAME');
   });
 
+  it('uses database-specific column name over property name even if the column name \
+  does not follow the connector-specific configuration (UPPERCASE)', function() {
+    const column = connector.column('order', 'des');
+    expect(column).to.eql('description');
+  });
+
   it('prefers property name when database is different', function() {
     const column = connector.column('customer', 'middleName');
     expect(column).to.eql('middle_name');
@@ -104,6 +129,13 @@ describe('sql connector', function() {
     expect(idCol).to.eql('NAME');
   });
 
+  it('should map id column name even if the column name does not \
+  follow the connector-specific configuration (UPPERCASE)', function() {
+    const idCol = connector.idColumn('order');
+    // shouldn't be converted to ORDERID
+    expect(idCol).to.eql('orderId');
+  });
+
   it('should find escaped id column name', function() {
     const idCol = connector.idColumnEscaped('customer');
     expect(idCol).to.eql('`NAME`');