public CacheKey createCacheKey(MappedStatement ms, Object parameterObject, RowBounds rowBounds, BoundSql boundSql) {
if (closed) throw new ExecutorException("Executor was closed.");
CacheKey cacheKey = new CacheKey();
cacheKey.update(ms.getId()); //方法名
cacheKey.update(rowBounds.getOffset()); //逻辑分页偏移量
cacheKey.update(rowBounds.getLimit()); //逻辑分页起始值
cacheKey.update(boundSql.getSql()); //sql语句
List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
if (parameterMappings.size() > 0 && parameterObject != null) {
TypeHandlerRegistry typeHandlerRegistry = ms.getConfiguration().getTypeHandlerRegistry();
if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
cacheKey.update(parameterObject); //参数类型
} else {
MetaObject metaObject = configuration.newMetaObject(parameterObject);
for (ParameterMapping parameterMapping : parameterMappings) {
String propertyName = parameterMapping.getProperty();
if (metaObject.hasGetter(propertyName)) {
cacheKey.update(metaObject.getValue(propertyName)); //参数值
} else if (boundSql.hasAdditionalParameter(propertyName)) {
cacheKey.update(boundSql.getAdditionalParameter(propertyName)); //额外参数
}
}
}
}
return cacheKey;
总结： 默认使用 perpetualCache
cache key = 方法名+ sql 语句+参数类型 +参数值+额外参数