spring-batch SqliteMaxValueIncrementer 源码
spring-batch SqliteMaxValueIncrementer 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/support/SqliteMaxValueIncrementer.java
/*
* Copyright 2014 the original author or authors.
*
* 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
*
* https://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 org.springframework.batch.item.database.support;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.sql.DataSource;
import org.springframework.dao.DataAccessResourceFailureException;
import org.springframework.jdbc.datasource.DataSourceUtils;
import org.springframework.jdbc.support.JdbcUtils;
import org.springframework.jdbc.support.incrementer.AbstractColumnMaxValueIncrementer;
/**
* Implemented as a package-private class since it is required for SQLite support, but
* should ideally be in Spring JDBC.
*
* @author Luke Taylor
* @since 3.0
*/
class SqliteMaxValueIncrementer extends AbstractColumnMaxValueIncrementer {
public SqliteMaxValueIncrementer(DataSource dataSource, String incrementerName, String columnName) {
super(dataSource, incrementerName, columnName);
}
/*
* (non-Javadoc)
*
* @see
* org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer#
* getNextKey()
*/
@Override
protected long getNextKey() {
Connection con = DataSourceUtils.getConnection(getDataSource());
Statement stmt = null;
try {
stmt = con.createStatement();
DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
stmt.executeUpdate("insert into " + getIncrementerName() + " values(null)");
ResultSet rs = stmt.executeQuery("select max(rowid) from " + getIncrementerName());
if (!rs.next()) {
throw new DataAccessResourceFailureException("rowid query failed after executing an update");
}
long nextKey = rs.getLong(1);
stmt.executeUpdate("delete from " + getIncrementerName() + " where " + getColumnName() + " < " + nextKey);
return nextKey;
}
catch (SQLException ex) {
throw new DataAccessResourceFailureException("Could not obtain rowid", ex);
}
finally {
JdbcUtils.closeStatement(stmt);
DataSourceUtils.releaseConnection(con, getDataSource());
}
}
}
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