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UpdateExecutor.java
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UpdateExecutor.java
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/*
* Copyright 1999-2019 Seata.io Group.
*
* 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 io.seata.rm.datasource.exec;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.StringJoiner;
import io.seata.common.util.IOUtil;
import io.seata.common.util.StringUtils;
import io.seata.config.Configuration;
import io.seata.config.ConfigurationFactory;
import io.seata.core.constants.ConfigurationKeys;
import io.seata.common.DefaultValues;
import io.seata.sqlparser.util.ColumnUtils;
import io.seata.rm.datasource.SqlGenerateUtils;
import io.seata.rm.datasource.StatementProxy;
import io.seata.rm.datasource.sql.struct.TableMeta;
import io.seata.rm.datasource.sql.struct.TableRecords;
import io.seata.sqlparser.SQLRecognizer;
import io.seata.sqlparser.SQLUpdateRecognizer;
/**
* The type Update executor.
*
* @param <T> the type parameter
* @param <S> the type parameter
* @author sharajava
*/
public class UpdateExecutor<T, S extends Statement> extends AbstractDMLBaseExecutor<T, S> {
private static final Configuration CONFIG = ConfigurationFactory.getInstance();
private static final boolean ONLY_CARE_UPDATE_COLUMNS = CONFIG.getBoolean(
ConfigurationKeys.TRANSACTION_UNDO_ONLY_CARE_UPDATE_COLUMNS, DefaultValues.DEFAULT_ONLY_CARE_UPDATE_COLUMNS);
/**
* Instantiates a new Update executor.
*
* @param statementProxy the statement proxy
* @param statementCallback the statement callback
* @param sqlRecognizer the sql recognizer
*/
public UpdateExecutor(StatementProxy<S> statementProxy, StatementCallback<T, S> statementCallback,
SQLRecognizer sqlRecognizer) {
super(statementProxy, statementCallback, sqlRecognizer);
}
@Override
protected TableRecords beforeImage() throws SQLException {
ArrayList<List<Object>> paramAppenderList = new ArrayList<>();
TableMeta tmeta = getTableMeta();
String selectSQL = buildBeforeImageSQL(tmeta, paramAppenderList);
return buildTableRecords(tmeta, selectSQL, paramAppenderList);
}
private String buildBeforeImageSQL(TableMeta tableMeta, ArrayList<List<Object>> paramAppenderList) {
SQLUpdateRecognizer recognizer = (SQLUpdateRecognizer) sqlRecognizer;
StringBuilder prefix = new StringBuilder("SELECT ");
StringBuilder suffix = new StringBuilder(" FROM ").append(getFromTableInSQL());
String whereCondition = buildWhereCondition(recognizer, paramAppenderList);
String orderByCondition = buildOrderCondition(recognizer, paramAppenderList);
String limitCondition = buildLimitCondition(recognizer, paramAppenderList);
if (StringUtils.isNotBlank(whereCondition)) {
suffix.append(WHERE).append(whereCondition);
}
if (StringUtils.isNotBlank(orderByCondition)) {
suffix.append(" ").append(orderByCondition);
}
if (StringUtils.isNotBlank(limitCondition)) {
suffix.append(" ").append(limitCondition);
}
suffix.append(" FOR UPDATE");
StringJoiner selectSQLJoin = new StringJoiner(", ", prefix.toString(), suffix.toString());
List<String> needUpdateColumns = getNeedUpdateColumns(tableMeta.getTableName(), sqlRecognizer.getTableAlias(), recognizer.getUpdateColumnsIsSimplified());
for (String needUpdateColumn : needUpdateColumns) {
selectSQLJoin.add(needUpdateColumn);
}
return selectSQLJoin.toString();
}
@Override
protected TableRecords afterImage(TableRecords beforeImage) throws SQLException {
TableMeta tmeta = getTableMeta();
if (beforeImage == null || beforeImage.size() == 0) {
return TableRecords.empty(getTableMeta());
}
String selectSQL = buildAfterImageSQL(tmeta, beforeImage);
ResultSet rs = null;
try (PreparedStatement pst = statementProxy.getConnection().prepareStatement(selectSQL)) {
SqlGenerateUtils.setParamForPk(beforeImage.pkRows(), getTableMeta().getPrimaryKeyOnlyName(), pst);
rs = pst.executeQuery();
return TableRecords.buildRecords(tmeta, rs);
} finally {
IOUtil.close(rs);
}
}
private String buildAfterImageSQL(TableMeta tableMeta, TableRecords beforeImage) throws SQLException {
StringBuilder prefix = new StringBuilder("SELECT ");
String whereSql = SqlGenerateUtils.buildWhereConditionByPKs(tableMeta.getPrimaryKeyOnlyName(), beforeImage.pkRows().size(), getDbType());
String suffix = " FROM " + getFromTableInSQL() + " WHERE " + whereSql;
StringJoiner selectSQLJoiner = new StringJoiner(", ", prefix.toString(), suffix);
SQLUpdateRecognizer recognizer = (SQLUpdateRecognizer) sqlRecognizer;
List<String> needUpdateColumns = getNeedUpdateColumns(tableMeta.getTableName(), sqlRecognizer.getTableAlias(), recognizer.getUpdateColumnsIsSimplified());
for (String needUpdateColumn : needUpdateColumns) {
selectSQLJoiner.add(needUpdateColumn);
}
return selectSQLJoiner.toString();
}
protected List<String> getNeedUpdateColumns(String table, String tableAlias, List<String> originUpdateColumns) {
List<String> needUpdateColumns = new ArrayList<>();
TableMeta tableMeta = getTableMeta(table);
if (ONLY_CARE_UPDATE_COLUMNS) {
if (!containsPK(table, originUpdateColumns)) {
needUpdateColumns.add(getColumnNamesWithTablePrefix(table,tableAlias, tableMeta.getEscapePkNameList(getDbType())));
}
needUpdateColumns.addAll(originUpdateColumns);
// The on update xxx columns will be auto update by db, so it's also the actually updated columns
List<String> onUpdateColumns = tableMeta.getOnUpdateColumnsOnlyName();
onUpdateColumns.removeAll(originUpdateColumns);
for (String onUpdateColumn : onUpdateColumns) {
needUpdateColumns.add(ColumnUtils.addEscape(onUpdateColumn, getDbType()));
}
} else {
for (String columnName : tableMeta.getAllColumns().keySet()) {
needUpdateColumns.add(ColumnUtils.addEscape(columnName, getDbType()));
}
}
return needUpdateColumns;
}
}