#!/bin/sh ##This bash file can update all git project in given directory echo"Please input your name: " read name echo"You had input name: $name"
echo"Please input your email: " read email echo"You had input email: $email"
#in case this file being invoked form other path base_dir=$(dirname "$0") #a tool script for colorful output
cd$base_dir
#read given directory as repositories directory, #or current directory project_dir="." if [ ! -z $1 ] then project_dir=$1 fi
if [ ! -d $project_dir ] then echo"$project_dir is not a directory." exit 1 fi
echo"Set repository base directory to $project_dir"
for project in `ls $project_dir` do if [ -d $project ] then cd$project #update git repository if [ -d '.git' ] then echo"Setting project:$project" git config --local user.name "$name" git config --local user.email "$email" echo"Done." echo else echo"$project is not a repository.\n" fi cd .. fi done exit 0
#!/bin/sh ##This bash file can update all git project in given directory #in case this file being invoked form other path base_dir=$(dirname "$0") #a tool script for colorful output
cd$base_dir
#read given directory as repositories directory, #or current directory project_dir="." if [ ! -z $1 ] then project_dir=$1 fi
if [ ! -d $project_dir ] then echo"$project_dir is not a directory." exit 1 fi
echo"Set repository base directory to $project_dir"
for project in `ls $project_dir` do if [ -d $project ] then cd$project #update git repository if [ -d '.git' ] then echo"Updating project:$project" git pull --all echo"Done." echo #update svn repository optional elif [ -d '.svn' ] then echo"Updating project:$project" svn update echo"Done." echo else echo"$project is not a repository.\n" fi cd .. fi done exit 0
// This example creates a prepared statement, something like select * from teacher where name = ?; @Select("Select * from teacher where name = #{name}") Teacher selectTeachForGivenName(@Param("name") String name);
// This example creates n inlined statement, something like select * from teacher where name = 'someName'; @Select("Select * from teacher where name = '${name}'") Teacher selectTeachForGivenName(@Param("name") String name);
<selectid="getAll"resultMap="BaseResultMap" > SELECT <includerefid="Base_Column_List" /> FROM users </select>
<selectid="getOne"parameterType="java.lang.Long"resultMap="BaseResultMap" > SELECT <includerefid="Base_Column_List" /> FROM users WHERE id = #{id} </select>
@Test publicvoidtestPageQuery()throws Exception { int pageIndex = 1, pageSize = 10; Sort sort = new Sort(Direction.DESC, "id"); Pageable pageable = new PageRequest(pageIndex, pageSize, sort); userRepository.findAll(pageable); userRepository.findByUserName("test", pageable); }
Limit查询
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User findFirstByOrderByLastnameAsc(); User findTopByOrderByAgeDesc(); Page<User> queryFirst10ByLastname(String lastname, Pageable pageable); List<User> findFirst10ByLastname(String lastname, Sort sort); List<User> findTop10ByLastname(String lastname, Pageable pageable);
自定义SQL查询
其实spring data jpa绝大部分的SQL都可以根据方法名定义的方式来实现，但是由于某些原因我们想使用自定义的SQL来查询，spring data jpa也是完美支持的；在SQL的查询方法上面使用@Query注解，如涉及到删除和修改则需要加上@Modifying，也可以根据需要添加 @Transactional 对事务的支持，查询超时的设置等
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@Modifying @Query("update User u set u.username = ?1 where u.id = ?2") intmodifyUserNameByUserId(String userName,Long id);
@Transactional @Modifying @Query("delete from User where id = ?1") voiddeleteByUserId(Long id);
@Transactional(timeout = 10) @Query("select u from User u where u.email = ?1") User findByEmail(String email);
多表查询
多表查询在spring data jpa中有两种实现方式，第一种是利用hibernate的级联查询来实现，第二种是创建一个结果集接口来接收查询后的结果，这里主要是第二种方式。
首先需要定义一个结果集的接口类。
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publicinterfaceHotelSummary{ City getCity(); String getName(); Double getAverageRating();
@Query("select h.city as city, h.name as name, avg(r.rating) as averageRating " - "from Hotel h left outer join h.reviews r where h.city = ?1 group by h") Page<HotelSummary> findByCity(City city, Pageable pageable);
@Query("select h.name as name, avg(r.rating) as averageRating " - "from Hotel h left outer join h.reviews r group by h") Page<HotelSummary> findByCity(Pageable pageable);
/* * Format date with the specified pattern * Also works with arrays, lists or sets */ ${#dates.format(date, 'dd/MMM/yyyy HH:mm')} ${#dates.arrayFormat(datesArray, 'dd/MMM/yyyy HH:mm')} ${#dates.listFormat(datesList, 'dd/MMM/yyyy HH:mm')} ${#dates.setFormat(datesSet, 'dd/MMM/yyyy HH:mm')}
/* * Create a date (java.util.Date) object for the current date and time */ ${#dates.createNow()}
/* * Create a date (java.util.Date) object for the current date (time set to 00:00) */ ${#dates.createToday()}
/* * Check whether a String is empty (or null). Performs a trim() operation before check * Also works with arrays, lists or sets */ ${#strings.isEmpty(name)} ${#strings.arrayIsEmpty(nameArr)} ${#strings.listIsEmpty(nameList)} ${#strings.setIsEmpty(nameSet)}
/* * Check whether a String starts or ends with a fragment * Also works with arrays, lists or sets */ ${#strings.startsWith(name,'Don')} // also array*, list* and set* ${#strings.endsWith(name,endingFragment)} // also array*, list* and set*
/* * Compute length * Also works with arrays, lists or sets */ ${#strings.length(str)}
@GetMapping("/getUser") @Cacheable(value="user-key") public User getUser(){ User user = userRepository.findUserByUserName("bb1"); System.out.println("若下面没出现“无缓存的时候调用”字样且能打印出数据表示测试成功");
return user; } }
其中value的值就是就是缓存到redis中的key。
共享Session
spring boot 整合 spring-session-data-redis 分布式系统中，session共享有很多的解决方案，其中托管到缓存中应该是最常用的方案之一。
Spring Session官方说明
Spring Session provides an API and implementations for managing a user’s session information.
@RestController publicclassHelloWorldController{ @GetMapping("/getUser") public User getUser(){ User user = new User(); user.setUserName("snaildev"); user.setPassword("123456"); return user; } }
publicinterfaceUserRepositoryextendsJpaRepository<User,Long> { User findByUserName(String userName); User findByUserNameOrEmail(String userName,String email); }
Spring Boot 本身并不提供 Spring 框架的核心特性以及扩展功能，只是用于快速、敏捷地开发新一代基于 Spring 框架的应用程序。同时它集成了大量常用的第三方库配置（如 Redis、MongoDB、JPA、RabbitMQ、Quartz 等），Spring Boot 应用中这些第三方库几乎可以零配置进行开箱即用，大部分的 Spring Boot 应用都只需要非常少量的配置代码，开发者能够更加专注于业务逻辑。
使用 Spring Boot 开发项目，有以下几方面优势：
Spring Boot 使开发变得简单，提供了丰富的解决方案，快速集成各种解决方案提升开发效率。
Spring Boot 使配置变得简单，提供了丰富的 Starters，集成主流开源产品往往只需要简单的配置即可。
Spring Boot 使部署变得简单，其本身内嵌启动容器，仅仅需要一个命令即可启动项目，结合 Jenkins、Docker 自动化运维非常容易实现。
Spring Boot 使监控变得简单，自带监控组件，使用 Actuator 轻松监控服务各项状态。
public PackageMan getHusband(){ return husband; } }
publicclassTestPackage{ publicstaticvoidmain(String[] args){ PackageMan man = new PackageMan("snail", 10000); PackageWoman woman = new PackageWoman("lucy"); man.marry(woman);
publicclassTestPackage{ publicstaticvoidmain(String[] args){ PackageMan man = new PackageMan("snail", 10000); PackageMan man1 = new PackageMan("thief", 10000);
// 1. Basic for loop. for(var i = 0; i < 5; i++){ //... }
// 2. Using Array's join and split methods Array.apply(null, Array(5)).forEach(function(){ //... });
// Lodash _.times(5, function(){ //... });
for 语句是执行虚幻的不二选择，Array.apply也可以模拟循环，但在上面代码的使用场景下，_.tiems()的解决方法更加简洁和易于理解。
深层查找属性值
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// Fetch the name of the first pet from each owner var ownerArr = [{ "owner": "Colin", "pets": [{"name": "dog1"}, {"name": "dog2"}] }, { "owner": "John", "pets": [{"name": "dog3"}, {"name": "dog4"}] }];
// Adding extend function to Object.prototype Object.prototype.extend = function(obj) { for (var i in obj) { if (obj.hasOwnProperty(i)) { this[i] = obj[i]; } } };
var objA = {"name": "colin", "car": "suzuki"}; var objB = {"name": "james", "age": 17};
// Native method: Remove an array of keys from object Object.prototype.remove = function(arr) { var that = this; arr.forEach(function(key){ delete(this[key]); }); };
var objA = {"name": "colin", "car": "suzuki", "age": 17};
