/**
* 获取第一个节点作为路由
*
* @param rrs 数据路由集合
* @param dataNode 数据库所在节点
* @param stmt 执行语句
* @return 数据路由集合
* @author mycat
*/
public static RouteResultset routeToSingleNode(RouteResultset rrs, String dataNode, String stmt) {
if (dataNode == null) {
return rrs;
}
RouteResultsetNode[] nodes = new RouteResultsetNode[1];
nodes[0] = new RouteResultsetNode(dataNode, rrs.getSqlType(), stmt); // rrs.getStatement()
rrs.setNodes(nodes);
rrs.setFinishedRoute(true);
if (rrs.getCanRunInReadDB() != null) {
nodes[0].setCanRunInReadDB(rrs.getCanRunInReadDB());
}
return rrs;
}
public static boolean processERChildTable(
final SchemaConfig schema, final String origSQL, final ServerConnection sc)
throws SQLNonTransientException {
String tableName = StringUtil.getTableName(origSQL).toUpperCase();
final TableConfig tc = schema.getTables().get(tableName);
if (null != tc && tc.isChildTable()) {
final RouteResultset rrs = new RouteResultset(origSQL, ServerParse.INSERT);
String joinKey = tc.getJoinKey();
MySqlInsertStatement insertStmt =
(MySqlInsertStatement) (new MySqlStatementParser(origSQL)).parseInsert();
int joinKeyIndex = getJoinKeyIndex(insertStmt.getColumns(), joinKey);
if (joinKeyIndex == -1) {
String inf = "joinKey not provided :" + tc.getJoinKey() + "," + insertStmt;
LOGGER.warn(inf);
throw new SQLNonTransientException(inf);
}
if (isMultiInsert(insertStmt)) {
String msg = "ChildTable multi insert not provided";
LOGGER.warn(msg);
throw new SQLNonTransientException(msg);
}
String joinKeyVal = insertStmt.getValues().getValues().get(joinKeyIndex).toString();
String sql = insertStmt.toString();
// try to route by ER parent partion key
RouteResultset theRrs = RouterUtil.routeByERParentKey(sql, rrs, tc, joinKeyVal);
if (theRrs != null) {
rrs.setFinishedRoute(true);
sc.getSession2().execute(rrs, ServerParse.INSERT);
return true;
}
// route by sql query root parent's datanode
final String findRootTBSql = tc.getLocateRTableKeySql().toLowerCase() + joinKeyVal;
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("find root parent's node sql " + findRootTBSql);
}
ListenableFuture<String> listenableFuture =
MycatServer.getInstance()
.getListeningExecutorService()
.submit(
new Callable<String>() {
@Override
public String call() throws Exception {
FetchStoreNodeOfChildTableHandler fetchHandler =
new FetchStoreNodeOfChildTableHandler();
return fetchHandler.execute(
schema.getName(), findRootTBSql, tc.getRootParent().getDataNodes());
}
});
Futures.addCallback(
listenableFuture,
new FutureCallback<String>() {
@Override
public void onSuccess(String result) {
if (Strings.isNullOrEmpty(result)) {
StringBuilder s = new StringBuilder();
LOGGER.warn(
s.append(sc.getSession2()).append(origSQL).toString()
+ " err:"
+ "can't find (root) parent sharding node for sql:"
+ origSQL);
sc.writeErrMessage(
ErrorCode.ER_PARSE_ERROR,
"can't find (root) parent sharding node for sql:" + origSQL);
return;
}
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(
"found partion node for child table to insert " + result + " sql :" + origSQL);
}
RouteResultset executeRrs = RouterUtil.routeToSingleNode(rrs, result, origSQL);
sc.getSession2().execute(executeRrs, ServerParse.INSERT);
}
@Override
public void onFailure(Throwable t) {
StringBuilder s = new StringBuilder();
LOGGER.warn(
s.append(sc.getSession2()).append(origSQL).toString() + " err:" + t.getMessage());
sc.writeErrMessage(ErrorCode.ER_PARSE_ERROR, t.getMessage() + " " + s.toString());
}
},
MycatServer.getInstance().getListeningExecutorService());
return true;
}
return false;
}
/**
* 处理分库表路由
*
* @param schema
* @param tablesAndConditions
* @param tablesRouteMap
* @throws SQLNonTransientException
*/
public static void findRouteWithcConditionsForTables(
SchemaConfig schema,
RouteResultset rrs,
Map<String, Map<String, Set<ColumnRoutePair>>> tablesAndConditions,
Map<String, Set<String>> tablesRouteMap,
String sql,
LayerCachePool cachePool,
boolean isSelect)
throws SQLNonTransientException {
// 为分库表找路由
for (Map.Entry<String, Map<String, Set<ColumnRoutePair>>> entry :
tablesAndConditions.entrySet()) {
String tableName = entry.getKey().toUpperCase();
TableConfig tableConfig = schema.getTables().get(tableName);
if (tableConfig == null) {
String msg =
"can't find table define in schema " + tableName + " schema:" + schema.getName();
LOGGER.warn(msg);
throw new SQLNonTransientException(msg);
}
// 全局表或者不分库的表略过（全局表后面再计算）
if (tableConfig.isGlobalTable()
|| schema.getTables().get(tableName).getDataNodes().size() == 1) {
continue;
} else { // 非全局表：分库表、childTable、其他
Map<String, Set<ColumnRoutePair>> columnsMap = entry.getValue();
String joinKey = tableConfig.getJoinKey();
String partionCol = tableConfig.getPartitionColumn();
String primaryKey = tableConfig.getPrimaryKey();
boolean isFoundPartitionValue =
partionCol != null && entry.getValue().get(partionCol) != null;
boolean isLoadData = false;
if (LOGGER.isDebugEnabled()) {
if (sql.startsWith(LoadData.loadDataHint)
|| rrs.isLoadData()) { // 由于load data一次会计算很多路由数据，如果输出此日志会极大降低load data的性能
isLoadData = true;
}
}
if (entry.getValue().get(primaryKey) != null
&& entry.getValue().size() == 1
&& !isLoadData) { // 主键查找
// try by primary key if found in cache
Set<ColumnRoutePair> primaryKeyPairs = entry.getValue().get(primaryKey);
if (primaryKeyPairs != null) {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("try to find cache by primary key ");
}
String tableKey = schema.getName() + '_' + tableName;
boolean allFound = true;
for (ColumnRoutePair pair : primaryKeyPairs) { // 可能id in(1,2,3)多主键
String cacheKey = pair.colValue;
String dataNode = (String) cachePool.get(tableKey, cacheKey);
if (dataNode == null) {
allFound = false;
continue;
} else {
if (tablesRouteMap.get(tableName) == null) {
tablesRouteMap.put(tableName, new HashSet<String>());
}
tablesRouteMap.get(tableName).add(dataNode);
continue;
}
}
if (!allFound) {
// need cache primary key ->datanode relation
if (isSelect && tableConfig.getPrimaryKey() != null) {
rrs.setPrimaryKey(tableKey + '.' + tableConfig.getPrimaryKey());
}
} else { // 主键缓存中找到了就执行循环的下一轮
continue;
}
}
}
if (isFoundPartitionValue) { // 分库表
Set<ColumnRoutePair> partitionValue = columnsMap.get(partionCol);
if (partitionValue == null || partitionValue.size() == 0) {
if (tablesRouteMap.get(tableName) == null) {
tablesRouteMap.put(tableName, new HashSet<String>());
}
tablesRouteMap.get(tableName).addAll(tableConfig.getDataNodes());
} else {
for (ColumnRoutePair pair : partitionValue) {
if (pair.colValue != null) {
Integer nodeIndex =
tableConfig.getRule().getRuleAlgorithm().calculate(pair.colValue);
if (nodeIndex == null) {
String msg =
"can't find any valid datanode :"
+ tableConfig.getName()
+ " -> "
+ tableConfig.getPartitionColumn()
+ " -> "
+ pair.colValue;
LOGGER.warn(msg);
throw new SQLNonTransientException(msg);
}
String node = tableConfig.getDataNodes().get(nodeIndex);
if (node != null) {
if (tablesRouteMap.get(tableName) == null) {
tablesRouteMap.put(tableName, new HashSet<String>());
}
tablesRouteMap.get(tableName).add(node);
}
}
if (pair.rangeValue != null) {
Integer[] nodeIndexs =
tableConfig
.getRule()
.getRuleAlgorithm()
.calculateRange(
pair.rangeValue.beginValue.toString(),
pair.rangeValue.endValue.toString());
for (Integer idx : nodeIndexs) {
String node = tableConfig.getDataNodes().get(idx);
if (node != null) {
if (tablesRouteMap.get(tableName) == null) {
tablesRouteMap.put(tableName, new HashSet<String>());
}
tablesRouteMap.get(tableName).add(node);
}
}
}
}
}
} else if (joinKey != null
&& columnsMap.get(joinKey) != null
&& columnsMap.get(joinKey).size()
!= 0) { // childTable (如果是select 语句的父子表join)之前要找到root table,将childTable移除,只留下root
// table
Set<ColumnRoutePair> joinKeyValue = columnsMap.get(joinKey);
ColumnRoutePair joinCol = null;
Set<String> dataNodeSet = ruleByJoinValueCalculate(rrs, tableConfig, joinKeyValue);
if (dataNodeSet.isEmpty()) {
throw new SQLNonTransientException("parent key can't find any valid datanode ");
}
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(
"found partion nodes (using parent partion rule directly) for child table to update "
+ Arrays.toString(dataNodeSet.toArray())
+ " sql :"
+ sql);
}
if (dataNodeSet.size() > 1) {
routeToMultiNode(rrs.isCacheAble(), rrs, dataNodeSet, sql);
rrs.setFinishedRoute(true);
return;
} else {
rrs.setCacheAble(true);
routeToSingleNode(rrs, dataNodeSet.iterator().next(), sql);
return;
}
} else {
// 没找到拆分字段，该表的所有节点都路由
if (tablesRouteMap.get(tableName) == null) {
tablesRouteMap.put(tableName, new HashSet<String>());
}
tablesRouteMap.get(tableName).addAll(tableConfig.getDataNodes());
}
}
}
}