Add user_exists? method

lib/mysql_framework/scripts/base.rb

@@ -50,6 +50,14 @@ def index_exists?(client, table_name, index_name)
         result.count >= 1
       end
 
+      def user_exists?(client, user, host)
+        result = client.query(<<~SQL)
+           SELECT user FROM mysql.user WHERE user = '#{user}' AND host = '#{host}';
+        SQL
+
+        result.count == 1
+      end
+
       def index_up_to_date?(client, table_name, index_name, columns)
         result = client.query(<<~SQL)
           SHOW INDEX FROM #{table_name} WHERE Key_name="#{index_name}";

lib/mysql_framework/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module MysqlFramework
-  VERSION = '2.1.9'
+  VERSION = '2.2.0'
 end

spec/lib/mysql_framework/scripts/base_spec.rb

@@ -87,6 +87,18 @@
     end
   end
 
+  describe '#user_exists?' do
+    it 'returns true when user exists' do
+      expect(client).to receive(:query).and_return(['result'])
+      expect(subject.user_exists?(client,'foo', 'localhost')).to eq(true)
+    end
+
+    it 'returns false when user does not exist' do
+      expect(client).to receive(:query).and_return([])
+      expect(subject.user_exists?(client,'foo', 'localhost')).to eq(false)
+    end
+  end
+
   describe '#index_up_to_date?' do
     before do
       expect(client).to receive(:query).and_return(