Mapped Statements
Mapped Statements can hold any SQL statement and can use Parameter Maps and
Result Maps for input and output. (A stored procedure is a specialized form of
a statement.
If the case is simple, the Mapped Statement can reference the parameter and
result classes directly. Mapped Statements support caching through reference
to a Cache Model element. The following example shows the syntax for a
statement element.
<statement id="statement.name"
[parameterMap="parameterMap.name"]
[parameterClass="class.name"]
[resultMap="resultMap.name"]
[resultClass="class.name"]
[listClass="class.name"]
[cacheModel="cache.name"]
>
select * from Products where Product_Id = [?|#propertyName#]
order by [$simpleDynamic$]
</statement>
The [bracketed] parts are optional, and some
options are mutually exclusive. It is perfectly legal to have a Mapped
Statement as simple as shown by the following example.
<statement id="InsertTestProduct" >
insert into Products (Product_Id, Product_Description) values (1, "Shih Tzu")
</statement>
The above example is obviously unlikely, unless you are running a
test. But it does shows that you can use SQLMap to execute arbitrary SQL
statements. More likely, you will use the object mapping features with
Parameter Maps and
Result Maps since that's where the magic happens.
Statement Types
The <statement> element is a general "catch all" element that can be
used for any type of SQL statement. Generally it is a good idea to use one of
the more specific statement-type elements. The more specific elements provided
better error-checking and even more functionality. (For example, the insert
statement can return a database-generated key.) The following table
summarizes the statement-type elements and their supported attributes and
features.
Statement Element |
Attribute |
Child Elements |
Methods |
<statement> |
id
parameterClass
resultClass
listClass
parameterMap
resultMap
cacheModel
|
None |
Insert
Update
Delete
All query methods
|
<insert> |
id
parameterClass
parameterMap
|
<selectKey>
<generate>
|
Insert
Update
Delete
|
<update> |
id
parameterClass
parameterMap
extends
|
<generate> |
Insert
Update
Delete
|
<delete> |
id
parameterClass
parameterMap
extends
|
<generate> |
Insert
Update
Delete
|
<select> |
id
parameterClass
resultClass
listClass
parameterMap
resultMap
cacheModel
extends
|
<generate> |
All query methods
|
<procedure> |
id
parameterClass
resultClass
listClass
parameterMap
resultMap
cacheModel
|
None |
Insert
Update
Delete
All query methods
|
Stored Procedures
TODO