我要评论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, "\\%") + "%";
到此这篇关于nodejs使用sql模糊查询的过程详解的文章就介绍到这了,更多相关nodejs sql模糊查询内容请搜索代码网以前的文章或继续浏览下面的相关文章希望大家以后多多支持代码网！
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