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Common configuration files of SSM framework
2022-07-06 15:59:00 【Star age Cao Botao】
All say SSM Is the configuration factory , Here is the SSM The commonly used configuration files of the framework are sorted out for future development and use .
maven rely on
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.3</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<!--mysql drive -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.21</version>
</dependency>
<!--mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.5</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.5</version>
</dependency>
<!--ssm-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<!-- Database connection pool -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.4.RELEASE</version>
</dependency>
<!--aop Woven in bag -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.6</version>
</dependency>
<!--junit unit testing -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
</dependency>
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<!--jackson-->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
JSP The file header
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<session-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/tx https://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">
<!--*****************************DAO*****************************-->
<context:property-placeholder location="classpath:database.properties"/>
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" id="mapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<property name="basePackage" value="com.botao.dao"/>
</bean>
<!--*****************************service*****************************-->
<context:component-scan base-package="com.botao.service"/>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
<aop:aspectj-autoproxy/>
</beans>
database.properties
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/library?useSSL=false&serverTimezone=UTC&characterEncoding=utf-8
jdbc.username=root
jdbc.password=123456
spring-mvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/tx https://www.springframework.org/schema/tx/spring-tx.xsd">
<!--*****************************mvc*****************************-->
<context:component-scan base-package="com.botao.controller"/>
<mvc:annotation-driven>
<mvc:message-converters>
<bean class="org.springframework.http.converter.StringHttpMessageConverter" id="converter">
<property name="supportedMediaTypes">
<list>
<value>text/plain;charset=UTF-8</value>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
<property name="failOnEmptyBeans" value="false"/>
</bean>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<mvc:cors>
<mvc:mapping path="/**" allowed-origins="*" allowed-methods="POST, GET, OPTIONS, DELETE, PUT" allowed-headers="Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With" allow-credentials="true"/>
</mvc:cors>
<mvc:default-servlet-handler/>
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!--fileupload-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8"/>
<property name="maxUploadSize" value="10485760"/>
<property name="maxInMemorySize" value="40960"/>
</bean>
</beans>
MybatisUtil.java
package botao.util;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.InputStream;
public class MybatisUtil {
private static SqlSessionFactory sqlSessionFactory;
static {
try {
InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
} catch (IOException e) {
e.printStackTrace();
}
}
public static SqlSession getSqlSession() {
return sqlSessionFactory.openSession(false);
}
public static void close(SqlSession sqlSession) {
sqlSession.close();
}
}
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<typeAliases>
<typeAlias alias="Author" type="domain.blog.Author"/>
<package name="domain.blog"/>
</typeAliases>
<mappers>
<mapper resource="org/mybatis/builder/BlogMapper.xml"/>
<mapper url="file:///var/mappers/BlogMapper.xml"/>
<mapper class="org.mybatis.builder.BlogMapper"/>
<package name="org.mybatis.builder"/>
</mappers>
</configuration>
mapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="org.mybatis.example.BlogMapper">
<select id="selectBlog" resultType="Blog">
select * from Blog where id = #{id}
</select>
</mapper>
Set up （settings）
This is a MyBatis The most important adjustment settings in , They will change MyBatis Runtime behavior for . The following table describes the meaning of the settings in the settings 、 Default value, etc .
| Set name | describe | Valid values | The default value is |
|---|---|---|---|
| cacheEnabled | Globally turn on or off any cache configured in all mapper profiles . | true | false | true |
| lazyLoadingEnabled | Global switch for delayed loading . When opened , All associated objects delay loading . You can set fetchType Property to override the on / off state of the item . | true | false | false |
| aggressiveLazyLoading | On , A call to any method loads all the deferred load properties of the object . otherwise , Each delay load property is loaded on demand （ Reference resources lazyLoadTriggerMethods). | true | false | false （ stay 3.4.1 In previous versions, the default is true） |
| multipleResultSetsEnabled | Whether to allow a single statement to return multiple result sets （ Need database driver support ）. | true | false | true |
| useColumnLabel | Use column labels instead of column names . The actual performance depends on the database driver , For details, please refer to the relevant documents of database drive , Or through comparative tests to observe . | true | false | true |
| useGeneratedKeys | allow JDBC Support automatic generation of primary key , Need database driver support . If set to true, Automatic primary key generation will be enforced . Although some database drivers do not support this feature , But it still works （ Such as Derby）. | true | false | False |
| autoMappingBehavior | Appoint MyBatis How should columns be automatically mapped to fields or properties . NONE Indicates that automatic mapping is turned off ;PARTIAL Only fields with no nested result mapping defined will be automatically mapped . FULL Will automatically map any complex result set （ Whether nested or not ）. | NONE, PARTIAL, FULL | PARTIAL |
| autoMappingUnknownColumnBehavior | Specify unknown column for discovery auto map target （ Or unknown property type ） act .NONE: No reaction WARNING: Output warning log （'org.apache.ibatis.session.AutoMappingUnknownColumnBehavior' The log level of must be set to WARN）FAILING: Mapping failed ( Throw out SqlSessionException) | NONE, WARNING, FAILING | NONE |
| defaultExecutorType | Configure default actuator .SIMPLE It's a common actuator ;REUSE The executor reuses the preprocessing statement （PreparedStatement）; BATCH The executor not only reuses statements, but also performs batch updates . | SIMPLE REUSE BATCH | SIMPLE |
| defaultStatementTimeout | Set timeout , It determines the number of seconds the database driver waits for a response from the database . | Arbitrary positive integer | Not set (null) |
| defaultFetchSize | Get quantity for driven result set （fetchSize） Set a suggested value . This parameter can only be overridden in query settings . | Arbitrary positive integer | Not set (null) |
| defaultResultSetType | Specifies the default scrolling strategy for the statement .（ New at 3.5.2） | FORWARD_ONLY | SCROLL_SENSITIVE | SCROLL_INSENSITIVE | DEFAULT（ Equivalent to not set ） | Not set (null) |
| safeRowBoundsEnabled | Whether pagination is allowed in nested statements （RowBounds）. Set to if allowed false. | true | false | False |
| safeResultHandlerEnabled | Whether result processors are allowed in nested statements （ResultHandler）. Set to if allowed false. | true | false | True |
| mapUnderscoreToCamelCase | Whether to enable automatic mapping of hump naming , That is, from the classic database column name A_COLUMN Mapping to classic Java Property name aColumn. | true | false | False |
| localCacheScope | MyBatis Using local caching mechanism （Local Cache） Prevent circular references and accelerate repeated nested queries . The default value is SESSION, All queries executed in a session are cached . If the setting is STATEMENT, The local cache will only be used to execute statements , Yes, the same SqlSession Will not be cached . | SESSION | STATEMENT | SESSION |
| jdbcTypeForNull | When no specific... Is specified for the parameter JDBC Type , The default of null value JDBC type . Some database drivers need to specify columns of JDBC type , In most cases, just use the general type , such as NULL、VARCHAR or OTHER. | JdbcType Constant , Common values ：NULL、VARCHAR or OTHER. | OTHER |
| lazyLoadTriggerMethods | Specifies which methods of the object trigger a delayed load . | Comma separated list of methods . | equals,clone,hashCode,toString |
| defaultScriptingLanguage | Designated dynamic SQL The default scripting language used in the build . | A type alias or fully qualified class name . | org.apache.ibatis.scripting.xmltags.XMLLanguageDriver |
| defaultEnumTypeHandler | Appoint Enum Default for use TypeHandler .（ New at 3.4.5） | A type alias or fully qualified class name . | org.apache.ibatis.type.EnumTypeHandler |
| callSettersOnNulls | Specifies that when the result set value is null Whether to call the setter（map When object is put） Method , It depends on Map.keySet() or null Values are useful when initializing . Pay attention to basic types （int、boolean etc. ） Can't be set to null Of . | true | false | false |
| returnInstanceForEmptyRow | When all columns of the returned row are empty ,MyBatis Default return null. When this setting is turned on ,MyBatis An empty instance will be returned . Please note that , It also applies to nested result sets （ Such as a set or association ）.（ New at 3.4.2） | true | false | false |
| logPrefix | Appoint MyBatis Prefix added to log name . | Any string | Not set |
| logImpl | Appoint MyBatis The implementation of the logs used , Auto find when not specified . | SLF4J | LOG4J | LOG4J2 | JDK_LOGGING | COMMONS_LOGGING | STDOUT_LOGGING | NO_LOGGING | Not set |
| proxyFactory | Appoint Mybatis The proxy tool used to create lazy load objects . | CGLIB | JAVASSIST | JAVASSIST （MyBatis 3.3 above ） |
| vfsImpl | Appoint VFS The implementation of the | Customize VFS Class fully qualified name of , Separated by commas . | Not set |
| useActualParamName | Allow the name in the method signature as the statement parameter name . To use this feature , Your project must adopt Java 8 compile , And add -parameters Options .（ New at 3.4.1） | true | false | true |
| configurationFactory | Specify a provider Configuration Instance classes . This one was returned Configuration Instance is used to load the value of the deferred load property of the deserialized object . This class must contain a signature of static Configuration getConfiguration() Methods .（ New at 3.2.3） | A type alias or fully qualified class name . | Not set |
| shrinkWhitespacesInSql | from SQL Delete the extra space characters in the . Please note that , It will also affect SQL Text string in . ( New at 3.5.5) | true | false | false |
| defaultSqlProviderType | Specifies an sql provider class that holds provider method (Since 3.5.6). This class apply to the type(or value) attribute on sql provider annotation(e.g. @SelectProvider), when these attribute was omitted. | A type alias or fully qualified class name | Not set |
A fully configured settings An example of the element is as follows ：
<settings>
<setting name="cacheEnabled" value="true"/>
<setting name="lazyLoadingEnabled" value="true"/>
<setting name="multipleResultSetsEnabled" value="true"/>
<setting name="useColumnLabel" value="true"/>
<setting name="useGeneratedKeys" value="false"/>
<setting name="autoMappingBehavior" value="PARTIAL"/>
<setting name="autoMappingUnknownColumnBehavior" value="WARNING"/>
<setting name="defaultExecutorType" value="SIMPLE"/>
<setting name="defaultStatementTimeout" value="25"/>
<setting name="defaultFetchSize" value="100"/>
<setting name="safeRowBoundsEnabled" value="false"/>
<setting name="mapUnderscoreToCamelCase" value="false"/>
<setting name="localCacheScope" value="SESSION"/>
<setting name="jdbcTypeForNull" value="OTHER"/>
<setting name="lazyLoadTriggerMethods" value="equals,clone,hashCode,toString"/>
</settings>
select
<select id="selectPerson" parameterType="int" parameterMap="deprecated" resultType="hashmap" resultMap="personResultMap" flushCache="false" useCache="true" timeout="10" fetchSize="256" statementType="PREPARED" resultSetType="FORWARD_ONLY">
| attribute | describe |
|---|---|
id | Unique identifier in namespace , Can be used to refer to this statement . |
parameterType | The class fully qualified name or alias of the parameter that will be passed into this statement . This property is optional , because MyBatis You can use the type processor （TypeHandler） Infer the parameters of the specific incoming statement , Default is not set （unset）. |
| parameterMap | Used to reference external parameterMap Properties of , It is now abandoned . Use inline parameter mapping and parameterType attribute . |
resultType | The fully qualified name or alias of the class expected to return the result from this statement . Be careful , If you are returning a collection , That should be set to the type the collection contains , Rather than the type of the collection itself . resultType and resultMap Only one can be used at the same time . |
resultMap | To the outside resultMap A named reference to . The resulting mapping is MyBatis The most powerful feature , If you understand it thoroughly , Many complex mapping problems can be solved easily . resultType and resultMap Only one can be used at the same time . |
flushCache | Set it to true after , As long as the statement is called , Both the local cache and the secondary cache will be emptied , The default value is ：false. |
useCache | Set it to true after , The result of this statement will be cached by the second level cache , The default value is ： Yes select Element is true. |
timeout | This setting is before throwing an exception , The number of seconds the driver waits for the database to return the result of the request . Default is not set （unset）（ Rely on the database driver ）. |
fetchSize | This is a recommended value for the driver , Try to make the number of rows returned by the driver in batches equal to this setting . Default is not set （unset）（ Dependency driven ）. |
statementType | Optional STATEMENT,PREPARED or CALLABLE. It will make MyBatis Separate use Statement,PreparedStatement or CallableStatement, The default value is ：PREPARED. |
resultSetType | FORWARD_ONLY,SCROLL_SENSITIVE, SCROLL_INSENSITIVE or DEFAULT（ Equivalent to unset） One of them , The default value is unset （ Rely on the database driver ）. |
databaseId | If the database vendor ID is configured （databaseIdProvider）,MyBatis Will load all without databaseId Or match the current databaseId The sentence of ; If there are sentences with and without , What you don't bring will be ignored . |
resultOrdered | This setting is only for nested results select sentence ： If true, It is assumed that nested result sets or groups are included , When a main result row is returned , There is no reference to the previous result set . This makes it possible to get nested result sets without running out of memory . The default value is ：false. |
resultSets | This setting only applies to multiple result sets . It will list the result sets returned after the statement is executed and give each result set a name , Multiple names are separated by commas . |
insert, update , delete
Data change statement insert,update and delete The implementation of is very close to ：
<insert id="insertAuthor" parameterType="domain.blog.Author" flushCache="true" statementType="PREPARED" keyProperty="" keyColumn="" useGeneratedKeys="" timeout="20">
<update id="updateAuthor" parameterType="domain.blog.Author" flushCache="true" statementType="PREPARED" timeout="20">
<delete id="deleteAuthor" parameterType="domain.blog.Author" flushCache="true" statementType="PREPARED" timeout="20">
| attribute | describe |
|---|---|
id | Unique identifier in namespace , Can be used to refer to this statement . |
parameterType | The class fully qualified name or alias of the parameter that will be passed into this statement . This property is optional , because MyBatis You can use the type processor （TypeHandler） Infer the parameters of the specific incoming statement , Default is not set （unset）. |
parameterMap | Used to reference external parameterMap Properties of , It is now abandoned . Use inline parameter mapping and parameterType attribute . |
flushCache | Set it to true after , As long as the statement is called , Both the local cache and the secondary cache will be emptied , The default value is ：（ Yes insert、update and delete sentence ）true. |
timeout | This setting is before throwing an exception , The number of seconds the driver waits for the database to return the result of the request . Default is not set （unset）（ Rely on the database driver ）. |
statementType | Optional STATEMENT,PREPARED or CALLABLE. It will make MyBatis Separate use Statement,PreparedStatement or CallableStatement, The default value is ：PREPARED. |
useGeneratedKeys | （ Only applicable to insert and update） This will make MyBatis Use JDBC Of getGeneratedKeys Method to retrieve the primary key generated inside the database （ such as ： image MySQL and SQL Server Such a relational database management system automatically incremental fields ）, The default value is ：false. |
keyProperty | （ Only applicable to insert and update） Specify properties that uniquely recognize the object ,MyBatis Will use getGeneratedKeys Or insert Of the statement selectKey The child element sets its value , The default value is ： Not set （unset）. If you generate more than one column , Multiple attribute names can be separated by commas . |
keyColumn | （ Only applicable to insert and update） Set the column name of the generated key value in the table , In some databases （ image PostgreSQL） in , When the primary key column is not the first column in the table , It must be set . If you generate more than one column , Multiple attribute names can be separated by commas . |
databaseId | If the database vendor ID is configured （databaseIdProvider）,MyBatis Will load all without databaseId Or match the current databaseId The sentence of ; If there are sentences with and without , What you don't bring will be ignored . |
dynamic sql
<select id="selectPostIn" resultType="domain.blog.Post">
SELECT *
FROM POST P
WHERE ID in
<foreach item="item" index="index" collection="list" open="(" separator="," close=")">
#{item}
</foreach>
</select>
<!-- Batch insert -->
<insert id="mAdd" parameterType="list">
insert into student (id, name, sex, card, phone, department, banji, banjiid)
values
<foreach collection="list" separator="," item="stu">
(#{stu.id}, #{stu.name}, #{stu.sex}, #{stu.card}, #{stu.phone}, #{stu.department}, #{stu.banji},1)
</foreach>
</insert>
<!-- Batch update mysql Batch update settings need to be enabled allowMultiQueries=true-->
<update id="mUpdate" parameterType="java.util.List">
<foreach collection="list" item="stu">
update student
<set>
<if test="stu.name!=null">
name = #{stu.name},
</if>
<if test="stu.sex!=null">
sex = #{stu.sex},
</if>
<if test="stu.card!=null">
card = #{stu.card},
</if>
<if test="stu.phone!=null">
phone = #{stu.phone},
</if>
<if test="stu.department!=null">
department = #{stu.department},
</if>
<if test="stu.banji!=null">
banji = #{stu.banji},
</if>
</set>
where id = #{stu.id};
</foreach>
</update>
<!--bind Fuzzy query -->
<select id="queryLikebanji" resultType="top.scsoul.mybatis.pojo.Student">
<bind name="banji" value="'%'+banji+'%'"/>
select * from student where banji like #{banji};
</select>
Association mapping
Two labels
one-on-one association
One to many collection
Two ways
nested queries
Nesting results
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--suppress SqlNoDataSourceInspection -->
<mapper namespace="com.botao.mapper.UserMapper">
<!-- Nesting results -->
<resultMap id="getUserByIdRm" type="com.botao.pojo.User">
<id property="id" column="user_id"/>
<result property="username" column="user_name"/>
<association property="cadId" column="user_card_id" javaType="com.botao.pojo.Card">
<id property="id" column="dbcardId"/>
<result property="createdBy" column="created_by"/>
</association>
<collection property="orders" ofType="order" javaType="list">
<id property="id" column="order_id"/>
<result property="name" column="order_name"/>
</collection>
</resultMap>
<select id="getUserById" parameterType="int" resultMap="getUserByIdRm">
select user.*, card.card_id as dbcardId, card.created_by, o.order_id, o.order_name
from user
join card on card.card_id = user.user_card_id
join `order` as o on user.user_id = o.user_id
where user.user_id = #{id};
</select>
<!-- nested queries -->
<resultMap id="getUserByIdRm2" type="com.botao.pojo.User">
<id property="id" column="user_id"/>
<result property="username" column="user_name"/>
<association property="cadId" column="user_card_id" select="com.botao.mapper.CardMapper.getCard">
</association>
<collection property="orders" ofType="com.botao.pojo.Order" column="user_id" select="com.botao.mapper.OrderMapper.getOrderByUserId">
</collection>
</resultMap>
<select id="getUserById2" parameterType="int" resultMap="getUserByIdRm2">
select user_id,user_name,user_card_id
from user
where user_id = #{id};
</select>
</mapper>
tip: Try to use join More efficient .
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