mybatis动态sql实现逻辑代码详解-木庄网络博客

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<?xml version = "1.0" ?>
<!DOCTYPE script SYSTEM "script-1.0.dtd">
<script namespace="user">
    <common id="commonOrder">
        order by id desc
    </common>
    <sql id="queryUser">
        select * from user
        <where>
            <if test='id != null '>
                id = #{id}
            </if>
            <if test="names != null and names.size() >0">
                and name in
                <foreach collection="names" item="item" separator="," open="(" close=")">
                    ${item}
                </foreach>
            </if>
        </where>
        <ref id="commonOrder"/>
    </sql>

    <sql id="updateUser">
        update user set name = ${name}
        <where>
            <if test='id != null '>
                id = #{id}
            </if>
        </where>
    </sql>

 
</script>

1.xml文件读取

xml标签编写规则

<!ELEMENT script (#PCDATA | sql | common)*>
<!ATTLIST script
namespace CDATA #REQUIRED
>
<!ELEMENT sql (#PCDATA | trim | where | set | foreach | choose | if | ref)*>
<!ATTLIST sql
id CDATA #REQUIRED
>
<!ELEMENT common (#PCDATA | trim | where | set | foreach | choose | if)*>
<!ATTLIST common
id CDATA #REQUIRED
>
<!ELEMENT ref (#PCDATA)*>
<!ATTLIST ref
id CDATA #REQUIRED
>
<!ELEMENT trim (#PCDATA | trim | where | set | foreach | choose | if)*>
<!ATTLIST trim
prefix CDATA #IMPLIED
prefixOverrides CDATA #IMPLIED
suffix CDATA #IMPLIED
suffixOverrides CDATA #IMPLIED
>
<!ELEMENT where (#PCDATA | trim | where | set | foreach | choose | if | ref)*>
<!ELEMENT set (#PCDATA | trim | where | set | foreach | choose | if)*>

<!ELEMENT foreach (#PCDATA | trim | where | set | foreach | choose | if)*>
<!ATTLIST foreach
collection CDATA #REQUIRED
item CDATA #IMPLIED
index CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
separator CDATA #IMPLIED
>

<!ELEMENT choose (when* , otherwise?)>
<!ELEMENT when (#PCDATA | trim | where | set | foreach | choose | if)*>
<!ATTLIST when
test CDATA #REQUIRED
>
<!ELEMENT otherwise (#PCDATA | trim | where | set | foreach | choose | if)*>

<!ELEMENT if (#PCDATA | trim | where | set | foreach | choose | if)*>
<!ATTLIST if
test CDATA #REQUIRED
>

DocumentBuilderFactory 是jdk自带的解析xml文件操作,位于 javax.xml.parsers 包,如图其是一个抽象类,因此无法被实例化

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