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Parameterized queries

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Hello,

I would like to be able to use an attribute of the parent block when writing an SQL query in an embed block. For the sake of example, consider I am in the document Trip to the Moon​ and I want to make a query that collects links to it. I would write

select b.* from blocks as b where b.content like "%trip to the moon%" order by updated desc

But I am already in Trip to the Moon​ (a document or a parent block with that name), so ideally I would like to grab the current document's title/name. I would like to replace the literal string "%trip to the moon%"​ with something like :parent.title​. How can I achieve this?

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    Parameterized queries

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    • ciwoyipang •

      思源 SQL 新人指南：SQL 语法 + Query + 模板 - 链滴 (ld246.com)

      SQL&Query 用法记录 - 链滴 (ld246.com)

      The above are two high-quality introductory articles from the Chinese community, which you may find readable using a translation tool.

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    • ciwoyipang • • 2

      You can use the Query Widget which will automatically bring out the path

      image.png

      image.png

      image.png

      1 Reply
    • alvorithm •
      VIP Warrior Author

      Hi,

      Tagging @zuoqiu as well (author of widget-query?).

      Reading the documentation of the widget and exploring the Refs table (use the source 😉 ), I have come up with the following SQL query

      SELECT src.* FROM blocks AS src WHERE src.id in
	(SELECT refs.block_id from refs 
		WHERE refs.def_block_id='.block{.root_id}');

      This actually does what I want, i.e. it lists all the blocks pointing to the query's root block (in this case, the doc that contains the query). But

      1. widget-query renders the output as a table. I would like to render the blocks normally. Is there a way to do it like in embed block queries?
      2. alternatively, I could in principle use the same query in an embed block. But when I do, this produces no results. My question here: is the dot syntax .block{.root_id} that accesses properties of the current block not allowed in normal embeds @88250 ?

      I have searched extensively but so far I haven't found a comprehensive documentation of the query system, though I am thankful to @leolee9086 for sharing some examples in the forum.

      Please let me know if you find ways to improve my query above!

      Thank you everybody for your patience, and apologies that I just discovered the forum has a threaded reply function.

      Á.

      edit:

      1. changed = to IN in query so as to be able to list multiple incoming links.
      2. simplified the nested query, blocks as def not needed for it
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      alvorithm updated this reply at 2023-12-21 01:10:59
      alvorithm updated this reply at 2023-12-21 01:06:30
    • alvorithm •
      VIP Warrior Author

      Hi again,

      I am wondering if using Javascript in the embed block could help here. Because I only get a partial translation and I don't know JS, I don't follow much of what is discussed in the feature request with issue number 9648, proposed by @frostime

      @frostime -- wout be possible to dynamically acquire metadata from the environment (current notebook/doc, preceding block, enclosing superblock) for use in a query by using the new //!js embed functionality?

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