MyBatis Multi-table query, auto-Generate ID

Source: Internet
Author: User

Basically, in the configuration file, configure the fields that you want to include.

Class Relationship: Account----role,1 to 1

Account contains role class

Java class:

public class account{   private Integer accountId;    Private String username;    private String password;    private role role;}
public class Role {private integer id;private integer leave;private String name;}

Database tables:

----the structure of the table ' account '--CREATE TABLE IF  not EXISTS' account ' (' AccountId ' )int( +) not NULLauto_increment, ' UserName 'varchar( +) COLLATE Utf8_bin not NULL, ' password 'varchar( +) COLLATE Utf8_bin not NULL,' Roleid 'int( +) not NULL,PRIMARY KEY(' accountId ')) ENGINE=InnoDBDEFAULTCHARSET=UTF8 COLLATE=Utf8_bin auto_increment=1005;
----the structure of the table ' role '--CREATE TABLE IF  not EXISTS' role ' (' ID ' )int( +) not NULLauto_increment, ' R_leave 'int( One) not NULL, ' name 'varchar( +) COLLATE Utf8_bin not NULL,  PRIMARY KEY(' id ')) ENGINE=InnoDBDEFAULTCHARSET=UTF8 COLLATE=Utf8_bin auto_increment= A;

Since I was separated, all have two profiles. Can be written in a configuration file

account-resultmap.xml settings, in the configuration file, also contains all the corresponding role classes :

<Mappernamespace= "Accountmap"><!--ID is used for auto-fill in *-mapper.xml -    <Resultmaptype= "Com.hoo.entity.Account"ID= "Accountresultmap">        <ID Property= "AccountId"column= "AccountId"/>        <result Property= "username"column= "UserName"/>        <result Property= "Password"column= "Password"/>        <Association Property= "Role"Javatype= "Com.hoo.entity.Role">             <ID Property= "id"column= "id"/>             <result Property= "Leave"column= "R_leave"/>             <result Property= "Name"column= "Name"/>        </Association>    </Resultmap></Mapper>

Mapper.xml set, Check the time, directly check two tables, mybatis automatic corresponding data :

<SelectID= "Getallaccount"Resulttype= "List"Resultmap= "Accountmap.accountresultmap">        <! [Cdata[SELECT * FROM account a,role R where]]>    </Select>        <!--Accountresultmap is defined in the Account-resultmap.xml resultmap -    <SelectID= "Getaccountbyid"ParameterType= "string"Resulttype= "Com.hoo.entity.Account"Resultmap= "Accountmap.accountresultmap">        <! [Cdata[SELECT * FROM account a,role r where A.accountid = #{id} and]]>    </Select><!--Auto-Generate ID policy -    <InsertID= "AddAccount"Usegeneratedkeys= "true"Keyproperty= "AccountId"ParameterType= "Account">INSERT into account (AccountId, status, username, Password,phone,email,roleid) VALUES (#{accountid}, #{st ATUs}, #{username}, #{password},#{phone},#{email},#{})</Insert>

MyBatis Multi-table query, auto-Generate ID

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