NodeJs如何使用SQL模糊查询

SmileNicky

发布于 2024-05-24 14:18:18

350

发布于 2024-05-24 14:18:18

最近在改一个比较久的项目，是使用nodejs写的，但是对于长期写java的后端开发来说，还是有点难维护，不过不改bug的话，就需要重新开发，所以只能慢慢看nodejs代码，测试人员提了一个需要支持模糊查询的bug，如果是java写的，可以马上改好，因为不熟悉nodejs代码，还是改了一两个小时，边找资料，边改，记录下来，方便回顾

实验环境

VS Code

Mysql 8.0.26

修改过程

最开始直接这样改

exports.queryWordsList = function (req, res, next) {
  var Words = DB.get('Words')
  var params = req.body
  var page = new Page({
    pageNum: params.pageNum || 1,
    pageSize: params.pageSize || 10,
  })
  delete params.pageNum
  delete params.pageSize
  var sql = `select t.id,t.name,t.words, t.type,t.tip_msg,t.replace_str,t.desc,
    UNIX_TIMESTAMP(t.create_time)*1000 as create_time,
    UNIX_TIMESTAMP(t.modify_time)*1000 as modify_time
    from t_words t`
  if (params.word) {
    sql = `${sql} WHERE name like '%?%' order by t.modify_time desc`
  } else {
    sql = `${sql} order by t.modify_time desc`
  }
  Words.queryPageBySql(sql,page,[params.word],function (err, result) {
      if (err) {
        res.json({ rescode: '10001', err: err })
        return
      }
      var list = page.list
      res.json({ rescode: '10000', data: result })
    }
  )
}

运行后，发现报错

{
    "rescode": "10001",
    "err": {
        "code": "ER_PARSE_ERROR",
        "errno": 1064,
        "sqlMessage": "You have an error in your SQL syntax; check the manual that corresponds to your OceanBase version for the right syntax to use near '其'%' order by t.modify_time desc ) T' at line 4",
        "sqlState": "42000",
        "index": 0,
        "sql": "select count(*) as count from ( select t.id,t.name,t.type,t.tip_msg,t.replace_str,t.desc,\n    UNIX_TIMESTAMP(t.create_time)*1000 as create_time,\n    UNIX_TIMESTAMP(t.modify_time)*1000 as modify_time\n    from t_words t WHERE name like '%'其'%' order by t.modify_time desc ) T"
    },
    "status": false,
    "req_id": "1713148803682.74"
}

所以，修改一下，传一个参数进去

exports.queryWordsList = function (req, res, next) {
  var Words = DB.get('Words')
  var params = req.body
  var page = new Page({
    pageNum: params.pageNum || 1,
    pageSize: params.pageSize || 10,
  })
  delete params.pageNum
  delete params.pageSize
  var sql = `select t.id,t.name,t.type,t.tip_msg,t.replace_str,t.desc,
    UNIX_TIMESTAMP(t.create_time)*1000 as create_time,
    UNIX_TIMESTAMP(t.modify_time)*1000 as modify_time
    from t_words t`
  if (params.word) {
    sql = `${sql} WHERE name like ? order by t.modify_time desc`
  } else {
    sql = `${sql} order by t.modify_time desc`
  }
  var queryWord = "%" + params.word + "%";
  Words.queryPageBySql(sql,page,[queryWord],function (err, result) {
      if (err) {
        res.json({ rescode: '10001', err: err })
        return
      }
      var list = page.list
      res.json({ rescode: '10000', data: result })
    }
  )
}

ok，经过测试，可以查询，不过测试，对于传入"其%"这样的查询字符，sql是直接当成关键字“其”进行模糊查询的，直接忽略了特殊符号“%”，所以要支持这种特殊符号查询，可以加上转义字符，暂时这样处理

sql = `${sql} WHERE name LIKE ? ESCAPE '\\' ORDER BY t.modify_time DESC`;
var queryWord = "%" + params.word.replace(/\\/g, "\\\\").replace(/%/g, "\\%") + "%";

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原始发表：2024-05-24，如有侵权请联系 cloudcommunity@tencent.com 删除

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