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我的开发日记（四）

来源：SegmentFault 2023-02-19 14:41:14 0浏览收藏

哈喽！今天心血来潮给大家带来了《我的开发日记（四）》，想必大家应该对数据库都不陌生吧，那么阅读本文就都不会很困难，以下内容主要涉及到MySQL、springboot、mybatis，若是你正在学习数据库，千万别错过这篇文章~希望能帮助到你！

今天有点跟

Caused by: java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.String
    at com.okay.family.common.StartRun.lambda$run$0(StartRun.java:34)
    at com.okay.family.common.StartRun$$Lambda$579/1939282277.apply(Unknown Source)
    at java.util.stream.Collectors.lambda$toMap$172(Collectors.java:1320)
    at java.util.stream.Collectors$$Lambda$583/629078509.accept(Unknown Source)
    at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
    at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
    at com.okay.family.common.StartRun.run(StartRun.java:34)
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:795)
    ... 5 common frames omitted

XML配置

&lt;select id=&quot;findAllHost&quot; resulttype=&quot;java.util.HashMap&quot;&gt;
        SELECT service_id,domain
        FROM
        <include refid="ENV_TABLE"></include>&lt;/select&gt;

接收方法

 List<hashmap string>> hosts = commonMapper.findAllHost();
        Map<integer string> collect = hosts.stream().collect(Collectors.toMap((x -> {
            Object service_id = x.get("service_id");
            return Integer.parseInt(service_id.toString());
        }), (x -> "https://" + x.get("domain"))));
        ServerHost.init(collect);</integer></hashmap>

insert select where

这个说起来有点复杂。我需要在数据库中创建一条记录，然后部分字段内容我需要从另外的两个表里面查询。在经历过一个小时的查阅、摸索、尝试终于搞完了。

这里有个坑，就是

    <insert id="addCase" usegeneratedkeys="true" keyproperty="id" parametertype="com.okay.family.common.bean.testcase.request.CaseAttributeBean">
        INSERT INTO
        <include refid="table"></include>

        (uid,editor,envId,serviceId,moduleId,apiId,name,level,host,path,type,method,headermoco,paramsmoco)

        select * from (select
        #{uid} aa,#{uid} bb,#{envId} cc,#{serviceId} dd ,#{moduleId} ee ,#{apiId} ff,#{name} gg,1,CONCAT("https://",domain),api_url,api_action,api_method,header_para,request_par
        FROM
        <include refid="api_info"></include>
        a LEFT JOIN
        <include refid="server_env"></include>
        s ON a.service = s.service_id WHERE a.id = #{apiId}) t

    </insert>

后来想想