MyBatis-3.4.2-源码分析15:XML解析之buildStatementFromContext(context.evalNodes(‘select|insert|update|delete’

接下来，重点来了，

buildStatementFromContext(context.evalNodes("select|insert|update|delete"))

private void buildStatementFromContext(List<XNode> list) {
// 从这里开始执行
// 一般不为null
if (configuration.getDatabaseId() != null) {
//所以，会走这个分支
buildStatementFromContext(list, configuration.getDatabaseId());
}
buildStatementFromContext(list, null);
}

继续执行

private void buildStatementFromContext(List<XNode> list, String requiredDatabaseId) {
// 开始遍历每1个节点
for (XNode context : list) {
// 拿到了每1个节点
final XMLStatementBuilder statementParser = new XMLStatementBuilder(configuration, builderAssistant,
context, requiredDatabaseId);
//看到这里了
try {
//开始解析
statementParser.parseStatementNode();
} catch (IncompleteElementException e) {
configuration.addIncompleteStatement(statementParser);
}
}
}

所以，接下来，看statementParser.parseStatementNode();

看之前，先看一下DTD的语法文件

<?xml version="1.0" encoding="UTF-8" ?>
<!--

Copyright 2009-2017 the original author or authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
 http://www.apache.org/licenses/LICENSE-2.0 
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

-->
<!ELEMENT mapper (cache-ref | cache | resultMap* | parameterMap* | sql* | insert* | update* | delete* | select* )+>
<!ATTLIST mapper
namespace CDATA #IMPLIED
>

<!ELEMENT cache-ref EMPTY>
<!ATTLIST cache-ref
namespace CDATA #REQUIRED
>

<!ELEMENT cache (property*)>
<!ATTLIST cache
type CDATA #IMPLIED
eviction CDATA #IMPLIED
flushInterval CDATA #IMPLIED
size CDATA #IMPLIED
readOnly CDATA #IMPLIED
blocking CDATA #IMPLIED
>

<!ELEMENT parameterMap (parameter+)?>
<!ATTLIST parameterMap
id CDATA #REQUIRED
type CDATA #REQUIRED
>

<!ELEMENT parameter EMPTY>
<!ATTLIST parameter
property CDATA #REQUIRED
javaType CDATA #IMPLIED
jdbcType CDATA #IMPLIED
mode (IN | OUT | INOUT) #IMPLIED
resultMap CDATA #IMPLIED
scale CDATA #IMPLIED
typeHandler CDATA #IMPLIED
>

<!ELEMENT resultMap (constructor?,id*,result*,association*,collection*, discriminator?)>
<!ATTLIST resultMap
id CDATA #REQUIRED
type CDATA #REQUIRED
extends CDATA #IMPLIED
autoMapping (true|false) #IMPLIED
>

<!ELEMENT constructor (idArg*,arg*)>

<!ELEMENT id EMPTY>
<!ATTLIST id
property CDATA #IMPLIED
javaType CDATA #IMPLIED
column CDATA #IMPLIED
jdbcType CDATA #IMPLIED
typeHandler CDATA #IMPLIED
>

<!ELEMENT result EMPTY>
<!ATTLIST result
property CDATA #IMPLIED
javaType CDATA #IMPLIED
column CDATA #IMPLIED
jdbcType CDATA #IMPLIED
typeHandler CDATA #IMPLIED
>

<!ELEMENT idArg EMPTY>
<!ATTLIST idArg
javaType CDATA #IMPLIED
column CDATA #IMPLIED
jdbcType CDATA #IMPLIED
typeHandler CDATA #IMPLIED
select CDATA #IMPLIED
resultMap CDATA #IMPLIED
name CDATA #IMPLIED
>

<!ELEMENT arg EMPTY>
<!ATTLIST arg
javaType CDATA #IMPLIED
column CDATA #IMPLIED
jdbcType CDATA #IMPLIED
typeHandler CDATA #IMPLIED
select CDATA #IMPLIED
resultMap CDATA #IMPLIED
name CDATA #IMPLIED
>

<!ELEMENT collection (constructor?,id*,result*,association*,collection*, discriminator?)>
<!ATTLIST collection
property CDATA #REQUIRED
column CDATA #IMPLIED
javaType CDATA #IMPLIED
ofType CDATA #IMPLIED
jdbcType CDATA #IMPLIED
select CDATA #IMPLIED
resultMap CDATA #IMPLIED
typeHandler CDATA #IMPLIED
notNullColumn CDATA #IMPLIED
columnPrefix CDATA #IMPLIED
resultSet CDATA #IMPLIED
foreignColumn CDATA #IMPLIED
autoMapping (true|false) #IMPLIED
fetchType (lazy|eager) #IMPLIED
>

<!ELEMENT association (constructor?,id*,result*,association*,collection*, discriminator?)>
<!ATTLIST association
property CDATA #REQUIRED
column CDATA #IMPLIED
javaType CDATA #IMPLIED
jdbcType CDATA #IMPLIED
select CDATA #IMPLIED
resultMap CDATA #IMPLIED
typeHandler CDATA #IMPLIED
notNullColumn CDATA #IMPLIED
columnPrefix CDATA #IMPLIED
resultSet CDATA #IMPLIED
foreignColumn CDATA #IMPLIED
autoMapping (true|false) #IMPLIED
fetchType (lazy|eager) #IMPLIED
>

<!ELEMENT discriminator (case+)>
<!ATTLIST discriminator
column CDATA #IMPLIED
javaType CDATA #REQUIRED
jdbcType CDATA #IMPLIED
typeHandler CDATA #IMPLIED
>

<!ELEMENT case (constructor?,id*,result*,association*,collection*, discriminator?)>
<!ATTLIST case
value CDATA #REQUIRED
resultMap CDATA #IMPLIED
resultType CDATA #IMPLIED
>

<!ELEMENT property EMPTY>
<!ATTLIST property
name CDATA #REQUIRED
value CDATA #REQUIRED
>

<!ELEMENT typeAlias EMPTY>
<!ATTLIST typeAlias
alias CDATA #REQUIRED
type CDATA #REQUIRED
>

<!ELEMENT select (#PCDATA | include | trim | where | set | foreach | choose | if | bind)*>
<!ATTLIST select
id CDATA #REQUIRED
parameterMap CDATA #IMPLIED
parameterType CDATA #IMPLIED
resultMap CDATA #IMPLIED
resultType CDATA #IMPLIED
resultSetType (FORWARD_ONLY | SCROLL_INSENSITIVE | SCROLL_SENSITIVE) #IMPLIED
statementType (STATEMENT|PREPARED|CALLABLE) #IMPLIED
fetchSize CDATA #IMPLIED
timeout CDATA #IMPLIED
flushCache (true|false) #IMPLIED
useCache (true|false) #IMPLIED
databaseId CDATA #IMPLIED
lang CDATA #IMPLIED
resultOrdered (true|false) #IMPLIED
resultSets CDATA #IMPLIED
>

<!ELEMENT insert (#PCDATA | selectKey | include | trim | where | set | foreach | choose | if | bind)*>
<!ATTLIST insert
id CDATA #REQUIRED
parameterMap CDATA #IMPLIED
parameterType CDATA #IMPLIED
timeout CDATA #IMPLIED
flushCache (true|false) #IMPLIED
statementType (STATEMENT|PREPARED|CALLABLE) #IMPLIED
keyProperty CDATA #IMPLIED
useGeneratedKeys (true|false) #IMPLIED
keyColumn CDATA #IMPLIED
databaseId CDATA #IMPLIED
lang CDATA #IMPLIED
>

<!ELEMENT selectKey (#PCDATA | include | trim | where | set | foreach | choose | if | bind)*>
<!ATTLIST selectKey
resultType CDATA #IMPLIED
statementType (STATEMENT|PREPARED|CALLABLE) #IMPLIED
keyProperty CDATA #IMPLIED
keyColumn CDATA #IMPLIED
order (BEFORE|AFTER) #IMPLIED
databaseId CDATA #IMPLIED
>

<!ELEMENT update (#PCDATA | selectKey | include | trim | where | set | foreach | choose | if | bind)*>
<!ATTLIST update
id CDATA #REQUIRED
parameterMap CDATA #IMPLIED
parameterType CDATA #IMPLIED
timeout CDATA #IMPLIED
flushCache (true|false) #IMPLIED
statementType (STATEMENT|PREPARED|CALLABLE) #IMPLIED
keyProperty CDATA #IMPLIED
useGeneratedKeys (true|false) #IMPLIED
keyColumn CDATA #IMPLIED
databaseId CDATA #IMPLIED
lang CDATA #IMPLIED
>

<!ELEMENT delete (#PCDATA | include | trim | where | set | foreach | choose | if | bind)*>
<!ATTLIST delete
id CDATA #REQUIRED
parameterMap CDATA #IMPLIED
parameterType CDATA #IMPLIED
timeout CDATA #IMPLIED
flushCache (true|false) #IMPLIED
statementType (STATEMENT|PREPARED|CALLABLE) #IMPLIED
databaseId CDATA #IMPLIED
lang CDATA #IMPLIED
>

<!-- Dynamic -->

<!ELEMENT include (property+)?>
<!ATTLIST include
refid CDATA #REQUIRED
>

<!ELEMENT bind EMPTY>
<!ATTLIST bind
name CDATA #REQUIRED
value CDATA #REQUIRED
>

<!ELEMENT sql (#PCDATA | include | trim | where | set | foreach | choose | if | bind)*>
<!ATTLIST sql
id CDATA #REQUIRED
lang CDATA #IMPLIED
databaseId CDATA #IMPLIED
>

<!ELEMENT trim (#PCDATA | include | trim | where | set | foreach | choose | if | bind)*>
<!ATTLIST trim
prefix CDATA #IMPLIED
prefixOverrides CDATA #IMPLIED
suffix CDATA #IMPLIED
suffixOverrides CDATA #IMPLIED
>
<!ELEMENT where (#PCDATA | include | trim | where | set | foreach | choose | if | bind)*>
<!ELEMENT set (#PCDATA | include | trim | where | set | foreach | choose | if | bind)*>

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

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

基本来说，只有select有resultType,其它没有。

---继续解析，来到核心位置

org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement