Add discover methods for model names and properties

.gitignore

@@ -10,3 +10,4 @@ analyse.r
 docs/html
 docs/man
 npm-debug.log
+.project

lib/schema.js

@@ -360,6 +360,43 @@ Schema.prototype.autoupdate = function (cb) {
     }
 };
 
+/**
+ * Discover existing database tables.
+ * This method returns an array of model objects, including {type, name, onwer}
+ * 
+ * @param options An object that contains the following settings:
+ * all: true - Discovering all models, false - Discovering the models owned by the current user 
+ * views: true - Including views, false - only tables
+ * limit: The page size
+ * offset: The starting index
+ */
+Schema.prototype.discoverModels = function (options, cb) {
+    this.freeze();
+    if (this.adapter.discoverModels) {
+        this.adapter.discoverModels(options, cb);
+    } else if (cb) {
+        cb();
+    }
+};
+
+/**
+ * Discover properties for a given model.
+ * @param options An object that contains the following settings:
+ * model: The model name
+ * limit: The page size
+ * offset: The starting index
+ * The method return an array of properties, including {owner, tableName, columnName, dataType, dataLength, nullable}
+ */
+Schema.prototype.discoverModelProperties = function (options, cb) {
+  this.freeze();
+  if (this.adapter.discoverModelProperties) {
+      this.adapter.discoverModelProperties(options, cb);
+  } else if (cb) {
+      cb();
+  }
+};
+
+
 /**
  * Check whether migrations needed
  * This method make sense only for sql adapters.