| /* Copyright 2017 The TensorFlow Authors. All Rights Reserved. |
| |
| 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. |
| ==============================================================================*/ |
| #ifndef TENSORFLOW_CORE_KERNELS_DATA_EXPERIMENTAL_SQL_SQLITE_QUERY_CONNECTION_H_ |
| #define TENSORFLOW_CORE_KERNELS_DATA_EXPERIMENTAL_SQL_SQLITE_QUERY_CONNECTION_H_ |
| |
| #include <memory> |
| |
| #include "tensorflow/core/kernels/data/experimental/sql/query_connection.h" |
| #include "tensorflow/core/lib/db/sqlite.h" |
| #include "tensorflow/core/platform/types.h" |
| |
| namespace tensorflow { |
| namespace data { |
| namespace experimental { |
| namespace sql { |
| |
| class SqliteQueryConnection : public QueryConnection { |
| public: |
| SqliteQueryConnection(); |
| ~SqliteQueryConnection() override; |
| Status Open(const string& data_source_name, const string& query, |
| const DataTypeVector& output_types) override; |
| Status Close() override; |
| Status GetNext(IteratorContext* ctx, std::vector<Tensor>* out_tensors, |
| bool* end_of_sequence) override; |
| |
| private: |
| // Prepares the query string `query_`. |
| Status PrepareQuery(); |
| // Fills `tensor` with the column_index_th element of the current row of |
| // `stmt_`. |
| void FillTensorWithResultSetEntry(const DataType& data_type, int column_index, |
| Tensor* tensor); |
| Sqlite* db_ = nullptr; |
| SqliteStatement stmt_; |
| int column_count_ = 0; |
| string query_; |
| DataTypeVector output_types_; |
| }; |
| |
| } // namespace sql |
| } // namespace experimental |
| } // namespace data |
| } // namespace tensorflow |
| |
| #endif // TENSORFLOW_CORE_KERNELS_DATA_EXPERIMENTAL_SQL_SQLITE_QUERY_CONNECTION_H_ |