Node.js数据表编辑器-如何使用组成联接的（knex）VIEW

Question

我正在使用node.js数据表编辑器库。 当尝试做一个复杂的左连接'portfolios_isin_mm.isin AND（securities.mic = Portfolios_isin_mm.mic）'...像这样：

let editor = new Editor( db, 'portfolios_isin_mm' )
    .fields(
        new Field( 'portfolios_isin_mm.account_id' ),
        new Field( 'portfolios_isin_mm.user_id' ),
        new Field( 'portfolios_isin_mm.uid_foreign' )
        new Field( 'securities.issuer_name' ),
        new Field( 'portfolios_isin_mm.isin' ),
        new Field( 'portfolios_isin_mm.mic' ),
       )

    .leftJoin( 'portfolios_isin', 'portfolios_isin.id', '=', 'portfolios_isin_mm.uid_foreign' )
    .leftJoin( 'securities', 'securities.isin', '=', 'portfolios_isin_mm.isin AND (securities.mic = portfolios_isin_mm.mic)' );
    //.leftJoin( 'securities', 'securities.isin', '=', 'portfolios_isin_mm.isin' );

我遇到错误了。 调试错误向我显示：

{ Error: ER_PARSE_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.`mic)`' at line 1
    at Query.Sequence._packetToError (/home/myproject/node_modules/mysql/lib/protocol/sequences/Sequence.js:47:14)
    at Query.ErrorPacket (/home/myproject/node_modules/mysql/lib/protocol/sequences/Query.js:77:18)
    at Protocol._parsePacket (/home/myproject/node_modules/mysql/lib/protocol/Protocol.js:278:23)
    at Parser.write (/home/myproject/node_modules/mysql/lib/protocol/Parser.js:76:12)
    at Protocol.write (/home/myproject/node_modules/mysql/lib/protocol/Protocol.js:38:16)
    at Socket.<anonymous> (/home/myproject/node_modules/mysql/lib/Connection.js:91:28)
    at Socket.<anonymous> (/home/myproject/node_modules/mysql/lib/Connection.js:502:10)
    at Socket.emit (events.js:182:13)
    at addChunk (_stream_readable.js:283:12)
    at readableAddChunk (_stream_readable.js:264:11)
    at Socket.Readable.push (_stream_readable.js:219:10)
    at TCP.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)
    --------------------
    at Protocol._enqueue (/home/myproject/node_modules/mysql/lib/protocol/Protocol.js:144:48)
    at Connection.query (/home/myproject/node_modules/mysql/lib/Connection.js:200:25)
    at /home/myproject/node_modules/knex/lib/dialects/mysql/index.js:152:18
    at Promise._execute (/home/myproject/node_modules/bluebird/js/release/debuggability.js:313:9)
    at Promise._resolveFromExecutor (/home/myproject/node_modules/bluebird/js/release/promise.js:483:18)
    at new Promise (/home/myproject/node_modules/bluebird/js/release/promise.js:79:10)
    at Client_MySQL._query (/home/myproject/node_modules/knex/lib/dialects/mysql/index.js:146:12)
    at Client_MySQL.query (/home/myproject/node_modules/knex/lib/client.js:197:17)
    at Runner.<anonymous> (/home/myproject/node_modules/knex/lib/runner.js:146:36)
    at Runner.tryCatcher (/home/myproject/node_modules/bluebird/js/release/util.js:16:23)
    at Runner.query (/home/myproject/node_modules/bluebird/js/release/method.js:15:34)
    at /home/myproject/node_modules/knex/lib/runner.js:65:21
    at tryCatcher (/home/myproject/node_modules/bluebird/js/release/util.js:16:23)
    at /home/myproject/node_modules/bluebird/js/release/using.js:185:26
    at tryCatcher (/home/myproject/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/home/myproject/node_modules/bluebird/js/release/promise.js:512:31)
  code: 'ER_PARSE_ERROR',
  errno: 1064,
  sqlMessage:
   'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near \'.`mic)`\' at line 1',
  sqlState: '42000',
  index: 0,
  sql:
   'select count(`portfolios_isin_mm`.`id`) as `cnt` from `portfolios_isin_mm` left join `portfolios_isin` on `portfolios_isin`.`id` = `portfolios_isin_mm`.`uid_foreign` left join `securities` on `securities`.`isin` = `portfolios_isin_mm`.`isin AND (securities`.`mic = portfolios_isin_mm`.`mic)`' }

...使用php库，一切正常：

->leftJoin( 'securities', 'securities.isin', '=', 'portfolios_isin_mm.isin AND (securities.mic = portfolios_isin_mm.mic)' ) 

据说我可以引用“目前唯一的方法是创建一个由连接组成的VIEW，然后可以从该视图中进行选择。 readTable（ https://editor.datatables.net/docs/1.8.1/nodejs/classes/ 编辑器 .editor.html＃readtable ）方法可用于从视图中读取信息，同时仍可更新到主机表。

我如何才能使复杂的左联接也可以在node.js中工作（使用组成该联接的VIEW（使用knex））？

...我正在使用$ node -v ... v10.15.0和“ datatables.net-editor-server”：“ ^ 1.8.1”

Answer 1

您在最后一个leftjoin中有语法错误。

.leftJoin( 'securities', 'securities.isin', '=', 'portfolios_isin_mm.isin AND (securities.mic = portfolios_isin_mm.mic)' )

这就是生成错误的SQL查询的原因：

select count(`portfolios_isin_mm`.`id`) as `cnt` from `portfolios_isin_mm` left join `portfolios_isin` on `portfolios_isin`.`id` = `portfolios_isin_mm`.`uid_foreign` left join `securities` on `securities`.`isin` = `portfolios_isin_mm`.`isin AND (securities`.`mic = portfolios_isin_mm`.`mic)`'

请注意，从开始的不完整的报价： portfolios_isin_mm .`isin

您应该考虑使用andOn（）在查询中包含“ AND”：

.leftJoin('securities', function() {
        this.on('securities.isin', '=', 'portfolios_isin_mm.isin')
            .andOn('securities.mic', '=', portfolios_isin_mm.mic')
    })