预计阅读时间: 20 分钟
Spring Data 在保持Spring一致方式上，提供了模板代码和尽可能的让你垂直同各种NoSQL仓库进行交互。根据你的需要，你可以通过定义Spring Data接口的硬性编码风格，为你整个项目开发一种持久化逻辑。
从Spring Data域对象和仓库开始说起，我们要学习两种实现Spring queries（数据查询）方式：1.命名约束 2.使用QueryDSL（一种在编译时确保类型安全的查询验证）
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.geekcap.javaworld</groupId>
<artifactId>spring-data-example</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring-data-example</name>
<url>http://maven.apache.org</url>
<properties>
<spring.version>3.2.1.RELEASE</spring.version>
<spring.data.mongodb.version>1.2.0.RELEASE</spring.data.mongodb.version>
<java.version>1.6</java.version>
<querydsl.version>2.9.0</querydsl.version>
</properties>
<dependencies>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
<exclusions>
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- Spring & Spring Data MongoDB -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-mongodb</artifactId>
<version>${spring.data.mongodb.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- Querydsl -->
<dependency>
<groupId>com.mysema.querydsl</groupId>
<artifactId>querydsl-mongodb</artifactId>
<version>${querydsl.version}</version>
</dependency>
<!-- Test -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>com.mysema.maven</groupId>
<artifactId>apt-maven-plugin</artifactId>
<version>1.0.8</version>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>process</goal>
</goals>
<configuration>
<outputDirectory>target/generated-sources</outputDirectory>
<processor>org.springframework.data.mongodb.repository.support.MongoAnnotationProcessor</processor>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
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:p="http://www.springframework.org/schema/p"
xmlns:mongo="http://www.springframework.org/schema/data/mongo"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:oxm="http://www.springframework.org/schema/oxm"
xsi:schemaLocation="http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm.xsd">
<!-- Component scan to find all Spring components -->
<context:component-scan base-package="com.geekcap.javaworld.springdata" />
<!-- Load Spring Data Mongo Support -->
<mongo:db-factory id="mongoDbFactory" dbname="SpringDataExample" host="localhost" port="27017"/>
<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
<constructor-arg ref="mongoDbFactory" />
<property name="writeConcern" value="SAFE" />
</bean>
<!-- Ask Spring Data to scan our domain objects -->
<mongo:mapping-converter id="mongoConverter" base-package="com.geekcap.javaworld.springdata.model" />
<!-- Ask Spring Data to scan our repositories -->
<mongo:repositories base-package="com.geekcap.javaworld.springdata.repository" />
</beans>