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本章中分析delete元素的解析。
1 配置文件
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
<!--
WARNING - @mbggenerated
This element is automatically generated by MyBatis Generator, do not modify.
This element was generated on Fri Aug 14 16:08:36 CST 2015.
-->
delete from tb_menu
where Id = #{id,jdbcType=INTEGER}
</delete>
2 方法parseStatementNode
public void parseStatementNode() {
// deleteByPrimaryKey
String id = context.getStringAttribute("id");
// null
String databaseId = context.getStringAttribute("databaseId");
// 第一次检查这里是不通过的，直接跳过
if (!databaseIdMatchesCurrent(id, databaseId, this.requiredDatabaseId)) return;
// null
Integer fetchSize = context.getIntAttribute("fetchSize");
// null
Integer timeout = context.getIntAttribute("timeout");
// null
String parameterMap = context.getStringAttribute("parameterMap");
// java.lang.Integer
String parameterType = context.getStringAttribute("parameterType");
// class java.lang.Integer
Class<?> parameterTypeClass = resolveClass(parameterType);
// null
String resultMap = context.getStringAttribute("resultMap");
// null
String resultType = context.getStringAttribute("resultType");
// null
String lang = context.getStringAttribute("lang");
// 获取默认的处理对象
// org.apache.ibatis.scripting.xmltags.XMLLanguageDriver
LanguageDriver langDriver = getLanguageDriver(lang);
// null
Class<?> resultTypeClass = resolveClass(resultType);
// null
String resultSetType = context.getStringAttribute("resultSetType");
// PREPARED
StatementType statementType = StatementType.valueOf(context.getStringAttribute("statementType", StatementType.PREPARED.toString()));
ResultSetType resultSetTypeEnum = resolveResultSetType(resultSetType);
// delete
String nodeName = context.getNode().getNodeName();
// DELETE
SqlCommandType sqlCommandType = SqlCommandType.valueOf(nodeName.toUpperCase(Locale.ENGLISH));
// false
boolean isSelect = sqlCommandType == SqlCommandType.SELECT;
// true
boolean flushCache = context.getBooleanAttribute("flushCache", !isSelect);
// false
boolean useCache = context.getBooleanAttribute("useCache", isSelect);
// false
boolean resultOrdered = context.getBooleanAttribute("resultOrdered", false);
// Include Fragments before parsing
XMLIncludeTransformer includeParser = new XMLIncludeTransformer(configuration, builderAssistant);
// 解析<include refid="Base_Column_List" />
includeParser.applyIncludes(context.getNode());
// Parse selectKey after includes and remove them.
processSelectKeyNodes(id, parameterTypeClass, langDriver);
// 这里很明显也是静态SQL
// org.apache.ibatis.builder.StaticSqlSource
SqlSource sqlSource = langDriver.createSqlSource(configuration, context, parameterTypeClass);
// null
String resultSets = context.getStringAttribute("resultSets");
// null
String keyProperty = context.getStringAttribute("keyProperty");
// null
String keyColumn = context.getStringAttribute("keyColumn");
// org.apache.ibatis.executor.keygen.NoKeyGenerator
KeyGenerator keyGenerator;
// deleteByPrimaryKey!selectKey
String keyStatementId = id + SelectKeyGenerator.SELECT_KEY_SUFFIX;
keyStatementId = builderAssistant.applyCurrentNamespace(keyStatementId, true);
if (configuration.hasKeyGenerator(keyStatementId)) {
keyGenerator = configuration.getKeyGenerator(keyStatementId);
} else {
keyGenerator = context.getBooleanAttribute("useGeneratedKeys",
configuration.isUseGeneratedKeys() && SqlCommandType.INSERT.equals(sqlCommandType))
? new Jdbc3KeyGenerator() : new NoKeyGenerator();
}
builderAssistant.addMappedStatement(id, sqlSource, statementType, sqlCommandType,
fetchSize, timeout, parameterMap, parameterTypeClass, resultMap, resultTypeClass,
resultSetTypeEnum, flushCache, useCache, resultOrdered,
keyGenerator, keyProperty, keyColumn, databaseId, langDriver, resultSets);
}
deleteByPrimaryKey最终的MappedStatement
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原文地址：http://my.oschina.net/u/1269959/blog/523704
