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| 1 | +/* |
| 2 | + * Copyright 2002-present the original author or authors. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * https://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +package org.springframework.jdbc.support.incrementer; |
| 18 | + |
| 19 | +import java.sql.Connection; |
| 20 | +import java.sql.ResultSet; |
| 21 | +import java.sql.SQLException; |
| 22 | +import java.sql.Statement; |
| 23 | + |
| 24 | +import javax.sql.DataSource; |
| 25 | + |
| 26 | +import org.springframework.dao.DataAccessResourceFailureException; |
| 27 | +import org.springframework.jdbc.datasource.DataSourceUtils; |
| 28 | +import org.springframework.jdbc.support.JdbcUtils; |
| 29 | + |
| 30 | +/** |
| 31 | + * {@link DataFieldMaxValueIncrementer} that increments the maximum value of a given table with |
| 32 | + * the equivalent of an auto-increment column, using a SQLite {@code select max(rowid)} query. |
| 33 | + * |
| 34 | + * @author Luke Taylor |
| 35 | + * @author Juergen Hoeller |
| 36 | + * @since 7.0 |
| 37 | + */ |
| 38 | +public class SqliteMaxValueIncrementer extends AbstractColumnMaxValueIncrementer { |
| 39 | + |
| 40 | + /** |
| 41 | + * Default constructor for bean property style usage. |
| 42 | + * @see #setDataSource |
| 43 | + * @see #setIncrementerName |
| 44 | + * @see #setColumnName |
| 45 | + */ |
| 46 | + public SqliteMaxValueIncrementer() { |
| 47 | + } |
| 48 | + |
| 49 | + /** |
| 50 | + * Convenience constructor. |
| 51 | + * @param dataSource the DataSource to use |
| 52 | + * @param incrementerName the name of the sequence/table to use |
| 53 | + * @param columnName the name of the column in the sequence table to use |
| 54 | + */ |
| 55 | + public SqliteMaxValueIncrementer(DataSource dataSource, String incrementerName, String columnName) { |
| 56 | + super(dataSource, incrementerName, columnName); |
| 57 | + } |
| 58 | + |
| 59 | + |
| 60 | + @Override |
| 61 | + protected long getNextKey() { |
| 62 | + Connection con = DataSourceUtils.getConnection(getDataSource()); |
| 63 | + Statement stmt = null; |
| 64 | + try { |
| 65 | + stmt = con.createStatement(); |
| 66 | + DataSourceUtils.applyTransactionTimeout(stmt, getDataSource()); |
| 67 | + stmt.executeUpdate("insert into " + getIncrementerName() + " values(null)"); |
| 68 | + ResultSet rs = stmt.executeQuery("select max(rowid) from " + getIncrementerName()); |
| 69 | + if (!rs.next()) { |
| 70 | + throw new DataAccessResourceFailureException("rowid query failed after executing an update"); |
| 71 | + } |
| 72 | + long nextKey = rs.getLong(1); |
| 73 | + stmt.executeUpdate("delete from " + getIncrementerName() + " where " + getColumnName() + " < " + nextKey); |
| 74 | + return nextKey; |
| 75 | + } |
| 76 | + catch (SQLException ex) { |
| 77 | + throw new DataAccessResourceFailureException("Could not obtain rowid", ex); |
| 78 | + } |
| 79 | + finally { |
| 80 | + JdbcUtils.closeStatement(stmt); |
| 81 | + DataSourceUtils.releaseConnection(con, getDataSource()); |
| 82 | + } |
| 83 | + } |
| 84 | + |
| 85 | +} |
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