predictors: Extract sql key-value tables into separate class.

chrome/browser/predictors/glowplug_key_value_table.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/predictors/glowplug_key_value_table.h"
+
+#include "third_party/protobuf/src/google/protobuf/message_lite.h"
+
+namespace predictors {
+
+namespace internal {
+
+void BindDataToStatement(const std::string& key,
+                         const google::protobuf::MessageLite& data,
+                         sql::Statement* statement) {
+  int size = data.ByteSize();
+  DCHECK_GT(size, 0);
+  std::vector<char> proto_buffer(size);
+  data.SerializeToArray(&proto_buffer[0], size);
+
+  statement->BindString(0, key);
+  statement->BindBlob(1, &proto_buffer[0], size);
+}
+
+std::string GetSelectAllSql(const std::string& table_name) {
+  return base::StringPrintf("SELECT * FROM %s", table_name.c_str());
+}
+std::string GetInsertSql(const std::string& table_name) {
+  return base::StringPrintf("INSERT INTO %s (key, proto) VALUES (?,?)",
+                            table_name.c_str());
+}
+std::string GetDeleteSql(const std::string& table_name) {
+  return base::StringPrintf("DELETE FROM %s WHERE key=?", table_name.c_str());
+}
+std::string GetDeleteAllSql(const std::string& table_name) {
+  return base::StringPrintf("DELETE FROM %s", table_name.c_str());
+}
+
+}  // namespace internal
+}  // namespace predictors