簡單引數傳遞是指：
actor selectactorbyid(long id);
<select
id="selectactorbyid"
resulttype
="canger.study.chapter04.bean.actor"
>
select actor_id as id, first_name as firstname ,last_name as lastname
from actor
where actor_id=#
select
>
待續
boolean insertactorbymap(map map);
<insert
id="insertactorbymap"
parametertype
="map"
>
insert into actor(first_name,last_name) values (#,#)
insert
>
mapmap = new hashmap()};
boolean insertactorbystring(string var1,string var2);
<insert
id="insertactorbystring"
>
insert into actor(first_name,last_name) values (#,#)
insert
>
system.out.println(result);
boolean insertactorbyparamstring(@param("firstname")string var1, @param("lastname")string var2);
<insert
id="insertactorbyparamstring"
>
insert into actor(first_name,last_name) values (#,#)
insert
>
system.out.println(result)
boolean insertactorbymixedstring(string var1, @param("lastname")string var2);
<
insert
id="insertactorbymixedstring"
>
insert into actor(first_name,last_name) values (#,#)
insert
>
或者<
insert
id="insertactorbymixedstring"
>
insert into actor(first_name,last_name) values (#,#)
insert
>
需要注意的是，如果此時採用命名引數（如@param("actor")）傳遞單個自定義型別引數，則不能直接引用屬性名，而需要採用級聯引用（actor.firstname或 param1.firstname）
boolean insertactor(actor actor);
<
insert
id="insertactor"
parametertype
="canger.study.chapter04.bean.actor"
>
insert into actor(first_name,last_name) values (#,#)
insert
>
actor actor = new actor("james","harden");
這種情況和傳遞多個基本引數沒有什麼打的區別，唯一需要注意的是需要使用級聯引用，才能使用自定義引數屬性的值
此時的引用規則如下：
listselectactorbyidlist( listlist);
list
selectactorbyidset( setset);
list
selectactorbyidarray( long array);
<select
id="selectactorbyidlist"
resulttype
="canger.study.chapter04.bean.actor"
>
select actor_id as id, first_name as firstname ,last_name as lastname
from actor
where actor_id in
<
foreach
collection
="list"
item
="actorid"
index
="index"
open
="("
close
=")"
separator
=","
>
#
foreach
>
select
>
<
select
id="selectactorbyidset"
resulttype
="canger.study.chapter04.bean.actor"
>
select actor_id as id, first_name as firstname ,last_name as lastname
from actor
where actor_id in
<
foreach
collection
="collection"
item
="actorid"
index
="index"
open
="("
close
=")"
separator
=","
>
#
foreach
>
select
>
<
select
id="selectactorbyidarray"
resulttype
="canger.study.chapter04.bean.actor"
>
select actor_id as id, first_name as firstname ,last_name as lastname
from actor
where actor_id in
<
foreach
collection
="array"
item
="actorid"
index
="index"
open
="("
close
=")"
separator
=","
>
#
foreach
>
select
>
system.out.println(actors);
});new long);
此時預設名稱 collection、list、array均失效，只能使用指定的名稱或param1進行引用
listselectactorbyidlist( @param("actorlist") listlist);
<select
id="selectactorbyidlist"
resulttype
="canger.study.chapter04.bean.actor"
>
select actor_id as id, first_name as firstname ,last_name as lastname
from actor
where actor_id = #
select
>
無特殊之處
mybatis中的mapper例項化
很多人用過mybatis，或者使用過springdata，那麼和傳統的jdbc相比，差別在 呢？傳統的dao層，介面需要有實現，需要連線發出sql，需要接收返回值，但是mybatis只需要實現介面，而不需要實現類，而且神奇的是，可以通過spring的註解，直接把介面的實現物件給取出，大家都知道，介面...
Mybatis的Mapper與sql引數傳遞
1.簡單型別 只有乙個引數 select id,role name,note fron t role where id public role getrole interger id 這裡的 的 id 可以是任意值，但一般與傳入的引數形參相同，方便理解 2.傳入引用變數 insert into t ...
mybatis中mapper配置詳解
mybatis 的真正強大在於它的對映語句，也是它的魔力所在。由於它的異常強大，對映器的 xml 檔案就顯得相對簡單。如果拿它跟具有相同功能的 jdbc 進行對比，你會立即發現省掉了將近 95 的 mybatis 就是針對 sql 構建的，並且比普通的方法做的更好。1 select 查詢 查詢語句是...