Dissolve gerrit-server top-level directory

Change-Id: I538512dfe0f1bea774c01fdd45fa410a45634011

java/com/google/gerrit/server/schema/MySql.java

@@ -0,0 +1,57 @@
+// Copyright (C) 2012 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.schema;
+
+import static com.google.gerrit.server.schema.JdbcUtil.hostname;
+import static com.google.gerrit.server.schema.JdbcUtil.port;
+
+import com.google.gerrit.server.config.ConfigSection;
+import com.google.gerrit.server.config.GerritServerConfig;
+import com.google.inject.Inject;
+import org.eclipse.jgit.lib.Config;
+
+class MySql extends BaseDataSourceType {
+
+  private Config cfg;
+
+  @Inject
+  MySql(@GerritServerConfig Config cfg) {
+    super("com.mysql.jdbc.Driver");
+    this.cfg = cfg;
+  }
+
+  @Override
+  public String getUrl() {
+    final StringBuilder b = new StringBuilder();
+    final ConfigSection dbs = new ConfigSection(cfg, "database");
+    b.append("jdbc:mysql://");
+    b.append(hostname(dbs.optional("hostname")));
+    b.append(port(dbs.optional("port")));
+    b.append("/");
+    b.append(dbs.required("database"));
+    // See https://stackoverflow.com/questions/42084633/table-name-pattern-can-not-be-null-or-empty-in-java
+    b.append("?nullNamePatternMatchesAll=true");
+    return b.toString();
+  }
+
+  @Override
+  public boolean usePool() {
+    // MySQL has given us trouble with the connection pool,
+    // sometimes the backend disconnects and the pool winds
+    // up with a stale connection. Fortunately opening up
+    // a new MySQL connection is usually very fast.
+    return false;
+  }
+}