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