/**
* 增加判断支持未配置分片的表走默认的dataNode
*
* @param schemaConfig
* @param tableName
* @return
*/
public static boolean isNoSharding(SchemaConfig schemaConfig, String tableName) {
if (schemaConfig.isNoSharding()) {
return true;
}
if (schemaConfig.getDataNode() != null && !schemaConfig.getTables().containsKey(tableName)) {
return true;
}
return false;
}
/**
* 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;
}