出现"ArangoError: bind parameter 'value1' was not declared in the query (while parsing)"错误

Question

出现"ArangoError: bind parameter 'value1' was not declared in the query (while parsing)"错误

7

我在我的Foxx应用程序中有这样的代码：

db._query(aqlQuery`
  FOR d IN FULLTEXT('api_texts', '${args.attribute}', '${args.search}')
    SORT d.${args.sort_by} ${args.sort}
    LIMIT ${args.skip}, ${args.limit}
    RETURN d
`).toArray()

看起来是正确的，但出现错误，错误信息为绑定参数'value1'在查询中未声明（解析时）。

我尝试在arangosh中运行它...也出现了同样的错误：

arangosh [ilearn]> db._query({ "query" : "\n        FOR d IN FULLTEXT('api_texts', '@value0', '@value1')\n          SORT d.@value2 @value3\n          LIMIT @value4, @value5\n          RETURN d\n      ", "bindVars" : { "value0" : "title_en", "value1" : "1", "value2" : "created_at", "value3" : "ASC", "value4" : 0, "value5" : 10 } })
JavaScript exception in file '/usr/local/Cellar/arangodb/2.8.6/share/arangodb/js/client/modules/org/arangodb/arangosh.js' at 106,13: ArangoError 1552: bind parameter 'value1' was not declared in the query (while parsing)
!      throw error;
!            ^
stacktrace: ArangoError: bind parameter 'value1' was not declared in the query (while parsing)
    at Object.exports.checkRequestResult (/usr/local/Cellar/arangodb/2.8.6/share/arangodb/js/client/modules/org/arangodb/arangosh.js:104:21)
    at ArangoStatement.execute (/usr/local/Cellar/arangodb/2.8.6/share/arangodb/js/client/modules/org/arangodb/arango-statement.js:186:12)
    at ArangoDatabase._query (/usr/local/Cellar/arangodb/2.8.6/share/arangodb/js/client/modules/org/arangodb/arango-database.js:814:45)
    at <shell command>:1:4

我是否做错了什么？请帮忙解答，谢谢！

附注：我的操作系统是OS X，使用的是Arangodb v2.8.6版本。

- artnikpro

1个回答

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- dothebart · Accepted Answer

你的错误在于在绑定值周围加上了引号。绑定值不能用引号设置。

由于你正在使用模板字符串，绑定值会自动被赋予一个名称：valueN。模板字符串引擎将你的查询翻译成类似以下的内容：

db._query(`
  FOR d IN FULLTEXT('api_texts', '@value0', '@value1')
    SORT d.@value2 @value3
    LIMIT @value4, @value5
    RETURN d
`, {value0: args.attribute, value1.... }).toArray()

我们最好通过调用模板处理器来检查这个问题，而不是直接将结果放入db._query()中：

args={
    attribute: "theAttribute", 
    search: "theSearchString", 
    sort_by: "sortByMe", 
    skip: 5, 
    limit: 10
}
aqlQuery`FOR d IN FULLTEXT('api_texts', '${args.attribute}', '${args.search}')
    SORT d.${args.sort_by} ${args.sort} LIMIT ${args.skip}, ${args.limit} RETURN d`
{ 
  "query" : "FOR d IN FULLTEXT('api_texts', '@value0', '@value1') 
             SORT d.@value2 @valu...", 
  "bindVars" : { 
    "value0" : "theAttribute", 
    "value1" : "theSearchString", 
    "value2" : "sortByMe", 
    "value3" : undefined, 
    "value4" : 5, 
    "value5" : 10 
  } 
}

由于绑定值不能在字符串中（否则它们将被视为字符串），因此您的查询不会引用@value0和@value1，这也是错误的原因：

在绑定值列表中指定了一个绑定值，但查询中没有引用该绑定值。

已更正的代码，${...}周围没有引号:

db._query(aqlQuery`
  FOR d IN FULLTEXT('api_texts', ${args.attribute}, ${args.search})
    SORT d.${args.sort_by} ${args.sort}
    LIMIT ${args.skip}, ${args.limit}
    RETURN d
`).toArray()