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sprin4.0-jdbctemplate.java
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--------------------------
JdbcTemplate
|
--------------------------
<
bean
id
=
"jdbcTemplate"
class
=
"org.springframework.jdbc.core.JdbcTemplate"
>
<
property
name
=
"dataSource"
ref
=
"datasource"
/>
</
bean
>
--------------------------
NamedParameterJdbcTemplate
|
--------------------------
>
org
.
springframework
.
jdbc
.
core
.
namedparam
.
NamedParameterJdbcTemplate
*
该类没有无参构造器
,
必须传递
:
DataSource
或者一个我也不知道是个啥的参数
!
>
在静待你的JDBC用法中
,
SQL参数是用占位符
"?"问号,表示!并且受到位置的限制
> 定位参数的问题在于,一旦参数的顺序发生变化!就必须改变参数绑定
> 在springJDBC框架中,绑定SQL参数的另一种选择就是,使用具名参数(named parameter)
> 具名参数:SQL按名称(以冒号开头),而不是按位置进行指定,具名参数更易于维护,也提升了可读性!具名参数由框架类在运行时用占位符取代
> 具名参数,只在NamedParameterJdbcTemplate类中得到支持
> 这东西的好处就是,参数的位置可以随意更换.不用管!但是要多写一个Map<String,Object>类!而且SQL语句变得更加的复杂
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