/**
* 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());
}
}
}
}
/**
* 多表路由
*
* @param schema
* @param ctx
* @param tables
* @param rrs
* @param isSelect
* @return
* @throws SQLNonTransientException
*/
public static RouteResultset tryRouteForTables(
SchemaConfig schema,
DruidShardingParseInfo ctx,
RouteCalculateUnit routeUnit,
RouteResultset rrs,
boolean isSelect,
LayerCachePool cachePool)
throws SQLNonTransientException {
List<String> tables = ctx.getTables();
if (schema.isNoSharding() || (tables.size() >= 1 && isNoSharding(schema, tables.get(0)))) {
return routeToSingleNode(rrs, schema.getDataNode(), ctx.getSql());
}
// 只有一个表的
if (tables.size() == 1) {
return RouterUtil.tryRouteForOneTable(
schema, ctx, routeUnit, tables.get(0), rrs, isSelect, cachePool);
}
Set<String> retNodesSet = new HashSet<String>();
// 每个表对应的路由映射
Map<String, Set<String>> tablesRouteMap = new HashMap<String, Set<String>>();
// 分库解析信息不为空
Map<String, Map<String, Set<ColumnRoutePair>>> tablesAndConditions =
routeUnit.getTablesAndConditions();
if (tablesAndConditions != null && tablesAndConditions.size() > 0) {
// 为分库表找路由
RouterUtil.findRouteWithcConditionsForTables(
schema, rrs, tablesAndConditions, tablesRouteMap, ctx.getSql(), cachePool, isSelect);
if (rrs.isFinishedRoute()) {
return rrs;
}
}
// 为全局表和单库表找路由
for (String tableName : tables) {
TableConfig tableConfig = schema.getTables().get(tableName.toUpperCase());
if (tableConfig == null) {
String msg =
"can't find table define in schema " + tableName + " schema:" + schema.getName();
LOGGER.warn(msg);
throw new SQLNonTransientException(msg);
}
if (tableConfig.isGlobalTable()) { // 全局表
if (tablesRouteMap.get(tableName) == null) {
tablesRouteMap.put(tableName, new HashSet<String>());
}
tablesRouteMap.get(tableName).addAll(tableConfig.getDataNodes());
} else if (tablesRouteMap.get(tableName) == null) { // 余下的表都是单库表
tablesRouteMap.put(tableName, new HashSet<String>());
tablesRouteMap.get(tableName).addAll(tableConfig.getDataNodes());
}
}
boolean isFirstAdd = true;
for (Map.Entry<String, Set<String>> entry : tablesRouteMap.entrySet()) {
if (entry.getValue() == null || entry.getValue().size() == 0) {
throw new SQLNonTransientException("parent key can't find any valid datanode ");
} else {
if (isFirstAdd) {
retNodesSet.addAll(entry.getValue());
isFirstAdd = false;
} else {
retNodesSet.retainAll(entry.getValue());
if (retNodesSet.size() == 0) { // 两个表的路由无交集
String errMsg =
"invalid route in sql, multi tables found but datanode has no intersection "
+ " sql:"
+ ctx.getSql();
LOGGER.warn(errMsg);
throw new SQLNonTransientException(errMsg);
}
}
}
}
if (retNodesSet != null && retNodesSet.size() > 0) {
if (retNodesSet.size() > 1 && isAllGlobalTable(ctx, schema)) {
// mulit routes ,not cache route result
if (isSelect) {
rrs.setCacheAble(false);
routeToSingleNode(rrs, retNodesSet.iterator().next(), ctx.getSql());
} else { // delete 删除全局表的记录
routeToMultiNode(isSelect, rrs, retNodesSet, ctx.getSql(), true);
}
} else {
routeToMultiNode(isSelect, rrs, retNodesSet, ctx.getSql());
}
}
return rrs;
}