TableShardRule#eval 根据路由规则解析sql的时候如果没匹配找到分片键的值
// full table scan if is not insert sql.
if (type != SqlType.INSERT && type != SqlType.REPLACE) {
if (forbidNoShardKeyWrite) {
if (SqlType.UPDATE == type || SqlType.DELETE == type) {
throw new ShardRouterException("Update or delete is forbidden without shard key!");
}
}
return new ShardEvalResult(tableName, masterDimension.getAllDBAndTables()); // 返回所有的库表
} else {
throw new ShardRouterException("Cannot find any shard columns in your insert sql.");
}
- 如果是 insert 或 replace 语句，必须提供分片键的值，不然直接报错
- 如果禁止不带分片键的写操作 forbidNoShardKeyWrite = true，则直接报错；否则返回所有的分库和分表，全表扫描
