private RouteResultset routeWithPartitionColumn(
SchemaConfig schema,
TableConfig tc,
QueryTreeNode ast,
InsertParseInf parsInf,
RouteResultset rrs,
String stmt,
LayerCachePool cachePool)
throws SQLNonTransientException {
String partColumn = tc.getPartitionColumn();
if (partColumn != null) {
String sharindVal = parsInf.columnPairMap.get(partColumn);
if (sharindVal != null) {
Set<ColumnRoutePair> col2Val = new HashSet<ColumnRoutePair>(1);
col2Val.add(new ColumnRoutePair(sharindVal));
return tryRouteForTable(ast, schema, rrs, false, stmt, tc, col2Val, null, cachePool);
} else { // must provide sharding_id when insert
String inf = "bad insert sql (sharding column:" + partColumn + " not provided," + stmt;
LOGGER.warn(inf);
throw new SQLNonTransientException(inf);
}
}
return null;
}
/**
* 简单描述该方法的实现功能
*
* @param ast QueryTreeNode
* @param schema 数据库名
* @param rrs 数据路由集合
* @param isSelect 是否是select语句标志
* @param sql 执行语句
* @param tc 表实体
* @param ruleCol2Val 一个ColumnRoutePair集合
* @param allColConds 一个ColumnRoutePair集合
* @param cachePool
* @return 一个数据路由集合
* @throws SQLNonTransientException
* @author mycat
*/
private RouteResultset tryRouteForTable(
QueryTreeNode ast,
SchemaConfig schema,
RouteResultset rrs,
boolean isSelect,
String sql,
TableConfig tc,
Set<ColumnRoutePair> ruleCol2Val,
Map<String, Set<ColumnRoutePair>> allColConds,
LayerCachePool cachePool)
throws SQLNonTransientException {
if (tc.getTableType() == TableConfig.TYPE_GLOBAL_TABLE && isSelect) {
sql = addSQLLmit(schema, rrs, ast, sql);
return RouterUtil.routeToSingleNode(rrs, tc.getRandomDataNode(), sql);
}
// no partion define or no where condtion for this table or no
// partion column condtions
boolean cache = isSelect;
if (ruleCol2Val == null || ruleCol2Val.isEmpty()) {
if (tc.isRuleRequired()) {
throw new IllegalArgumentException(
"route rule for table " + tc.getName() + " is required: " + sql);
} else if (allColConds != null && allColConds.size() == 1) {
// try if can route by ER relation
if (tc.isSecondLevel() && tc.getParentTC().getPartitionColumn().equals(tc.getParentKey())) {
Set<ColumnRoutePair> joinKeyPairs = allColConds.get(tc.getJoinKey());
if (joinKeyPairs != null) {
Set<String> dataNodeSet = RouterUtil.ruleCalculate(tc.getParentTC(), joinKeyPairs);
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) {
return routeToMultiNode(schema, isSelect, isSelect, ast, rrs, dataNodeSet, sql);
} else {
rrs.setCacheAble(true);
return RouterUtil.routeToSingleNode(rrs, dataNodeSet.iterator().next(), sql);
}
}
}
// try by primary key if found in cache
Set<ColumnRoutePair> primaryKeyPairs = allColConds.get(tc.getPrimaryKey());
if (primaryKeyPairs != null) {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("try to find cache by primary key ");
}
cache = false;
Set<String> dataNodes = new HashSet<String>(primaryKeyPairs.size());
boolean allFound = true;
String tableKey = schema.getName() + '_' + tc.getName();
for (ColumnRoutePair pair : primaryKeyPairs) {
String cacheKey = pair.colValue;
String dataNode = (String) cachePool.get(tableKey, cacheKey);
if (dataNode == null) {
allFound = false;
break;
} else {
dataNodes.add(dataNode);
}
}
if (allFound) {
return routeToMultiNode(schema, isSelect, isSelect, ast, rrs, dataNodes, sql);
}
// need cache primary key ->datanode relation
if (isSelect && tc.getPrimaryKey() != null) {
rrs.setPrimaryKey(tableKey + '.' + tc.getPrimaryKey());
}
}
}
return routeToMultiNode(schema, isSelect, cache, ast, rrs, tc.getDataNodes(), sql);
}
// match table with where condtion of partion colum values
Set<String> dataNodeSet = RouterUtil.ruleCalculate(tc, ruleCol2Val);
if (dataNodeSet.size() == 1) {
rrs.setCacheAble(isSelect);
return RouterUtil.routeToSingleNode(rrs, dataNodeSet.iterator().next(), sql);
} else {
return routeToMultiNode(schema, isSelect, isSelect, ast, rrs, dataNodeSet, sql);
}
}