基于spring boot 1.5.4 集成 jpa+hibernate+jdbcTemplate(详解)

1.pom添加依赖

<!-- spring data jpa,会注入tomcat jdbc pool/hibernate等 -->
　　　　 <dependency>
      <groupid>org.springframework.boot</groupid>
      <artifactid>spring-boot-starter-data-jpa</artifactid>
    </dependency>
    <dependency>
      <groupid>mysql</groupid>
      <artifactid>mysql-connector-java</artifactid>
      <version>5.1.42</version>
    </dependency>

2.添加数据源配置（datasource啥的，一系列对象spring boot 都会给你注入的，配置配置即可！）

spring.datasource.url=jdbc:mysql://localhost/test?characterencoding=utf8&usessl=true
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.driver

#database pool config
# number of ms to wait before throwing an exception if no connection is available.
spring.datasource.tomcat.max-wait=10000
# maximum number of active connections that can be allocated from this pool at the same time.
spring.datasource.tomcat.max-active=300
# validate the connection before borrowing it from the pool.
spring.datasource.tomcat.test-on-borrow=true
# initial pool size
spring.datasource.tomcat.initial-size=20


#=====================jpa config================================
#实体类维护数据库表结构的具体行为：update/create/create-drop/validate/none
spring.jpa.hibernate.ddl-auto=none
#打印sql语句
spring.jpa.show-sql=true
#格式化输出的json字符串
spring.jackson.serialization.indent_output=true

3.新建实体

@entity
@table(name="user")
public class user {

  @id
  @column(name="id")
  @generatedvalue(strategy = generationtype.identity)
  private integer id;

  @column(name="number")
  private string number;

  @column(name="name")
  private string name;

  public integer getid() {
    return id;
  }

  public void setid(integer id) {
    this.id = id;
  }

  public string getnumber() {
    return number;
  }

  public void setnumber(string number) {
    this.number = number;
  }

  public string getname() {
    return name;
  }

  public void setname(string name) {
    this.name = name;
  }
}

4.dao层

public interface userdao{

  user getbyid(int id);

  user getbynumber(string number);

  int adduser(user user);

  void deleteuserbyid(int id);

  user updateuser(user user);

}

@repository
public class userdaoimpl implements userdao {

  @persistencecontext
  private entitymanager entitymanager;

  @override
  public user getbyid(int id) {
    //find by primary key
    return this.entitymanager.find(user.class,id);
  }

  @override
  public user getbynumber(string number) {
    query query = this.entitymanager.createquery("from user u where u.number=:number",user.class);
    query.setparameter("number",number);
    user user = (user)query.getsingleresult();
    return user;
  }

  @override
  public int adduser(user user) {
    this.entitymanager.persist(user);
    //print the id
    system.out.println(user.getid());
    return user.getid();
  }

  @override
  public void deleteuserbyid(int id) {
    user user = this.entitymanager.find(user.class,id); //关联到记录，方可删除
    this.entitymanager.remove(user);
  }

  @override
  public user updateuser(user user) {
    user usernew = this.entitymanager.merge(user);
    return usernew;
  }
}

5.service层

public interface userservice {

  user getbyid(int id);

  user getbynumber(string number);

  int adduser(user user,boolean throwex);

  void deleteuserbyid(int id);

  user updateuser(user user);
}

@service
@transactional
public class userserviceimpl implements userservice {

  @autowired
  private userdao userdao;

  @override
  @transactional(readonly = true)
  public user getbyid(int id) {
    return userdao.getbyid(id);
  }

  @override
  @transactional(readonly = true)
  public user getbynumber(string number) {
    return userdao.getbynumber(number);
  }

  @override
  public int adduser(user user,boolean throwex) {
    int id= this.userdao.adduser(user);
    if(throwex){
      throw new runtimeexception("throw a ex");
    }
    return id;
  }

  @override
  public void deleteuserbyid(int id) {
    this.userdao.deleteuserbyid(id);
  }

  @override
  public user updateuser(user user) {
    return this.userdao.updateuser(user);
  }


}

6.controller层

@controller("user1")
@requestmapping("/jpa/user")
public class usercontroller {
  /**
   * 日志（slf4j->logback）
   */
  private static final logger logger = loggerfactory.getlogger(usercontroller.class);

  @autowired
  private userservice userservice;

  /**
   * 返回text格式数据
   * @param id 主键id
   * @return 用户json字符串
   */
  @requestmapping("/get/id/{id}")
  @responsebody
  public string getuserbyid(@pathvariable("id")string id){
    logger.info("request /user/get/id/{id}, parameter is "+id);
    user user = userservice.getbyid(integer.parseint(id));
    return jsonobject.tojsonstring(user);
  }

  /**
   * 返回json格式数据
   * @param number 编号
   * @return 用户
   */
  @requestmapping("/get/number/{number}")
  @responsebody
  public user getuserbynumber(@pathvariable("number")string number){
    user user = userservice.getbynumber(number);
    return user;
  }

  @requestmapping("/add/{number}/{name}")
  @responsebody
  public string adduser(@pathvariable("number")string number,@pathvariable("name")string name,boolean throwex){
    user user = new user();
    user.setnumber(number);
    user.setname(name);
    int id = -1;
    try{
      id = userservice.adduser(user,throwex);
    }catch (runtimeexception ex){
      system.out.println(ex.getmessage());
    }
    return string.valueof(id);
  }

  @requestmapping("/delete/{id}")
  @responsebody
  public void getuserbyid(@pathvariable("id")int id){
    this.userservice.deleteuserbyid(id);
  }

  @requestmapping("/update/{id}/{number}/{name}")
  @responsebody
  public user adduser(@pathvariable("id")int id, @pathvariable("number")string number, @pathvariable("name")string name){
    user user = new user();
    user.setid(id);
    user.setnumber(number);
    user.setname(name);
    return userservice.updateuser(user);
  }
}

7. spring data jpa新使用方式，更高级

1.dao

@repository
public interface userrepository extends jparepository<user, integer> {
  /**
   * spring data jpa 会自动注入实现（根据方法命名规范）
   * @return
   */
  user findbynumber(string number);


  @modifying
  @query("delete from user u where u.id = :id")
  void deleteuser(@param("id")int id);
}

2.service

public interface userservice {

  user findbyid(int id);

  user findbynumber(string number);

  list<user> findalluserbypage(int page,int size);

  user updateuser(user user,boolean throwex);

  void deleteuser(int id);
}

@service
@transactional
public class userserviceimpl implements userservice {

  @autowired
  private userrepository userrepository;

  @override
  public user findbyid(int id) {
    return this.userrepository.findone(id);
  }

  @override
  public user findbynumber(string number) {
    return this.userrepository.findbynumber(number);
  }

  @override
  public list<user> findalluserbypage(int page,int size) {
    pageable pageable = new pagerequest(page, size);
    page<user> users = this.userrepository.findall(pageable);
    return users.getcontent();
  }

  @override
  public user updateuser(user user,boolean throwex) {
    user usernew = this.userrepository.save(user);
    if(throwex){
      throw new runtimeexception("throw a ex");
    }
    return usernew;
  }

  @override
  public void deleteuser(int id) {
    this.userrepository.deleteuser(id);
  }
}


3.controller

@controller("user2")
@requestmapping("/datajpa/user")
public class usercontroller {
  /**
   * 日志（slf4j->logback）
   */
  private static final logger logger = loggerfactory.getlogger(usercontroller.class);

  @autowired
  private userservice userservice;

  /**
   * 返回text格式数据
   * @param id 主键id
   * @return 用户json字符串
   */
  @requestmapping("/get/id/{id}")
  @responsebody
  public string getuserbyid(@pathvariable("id")string id){
    logger.info("request /user/get/id/{id}, parameter is "+id);
    user user = userservice.findbyid(integer.parseint(id));
    return jsonobject.tojsonstring(user);
  }

  /**
   * 返回json格式数据
   * @param number 编号
   * @return 用户
   */
  @requestmapping("/get/number/{number}")
  @responsebody
  public user getuserbynumber(@pathvariable("number")string number){
    user user = userservice.findbynumber(number);
    return user;
  }

  @requestmapping("/get/all/{page}/{size}")
  @responsebody
  public list<user> getalluserbypage(@pathvariable("page")int page,@pathvariable("size")int size){
    return this.userservice.findalluserbypage(page,size);
  }

  @requestmapping("/update/{id}/{number}/{name}")
  @responsebody
  public user adduser(@pathvariable("id")int id, @pathvariable("number")string number, @pathvariable("name")string name,boolean throwex){
    user user = new user();
    user.setid(id);
    user.setnumber(number);
    user.setname(name);
    user usernew = null;
    try{
      userservice.updateuser(user,throwex);
    }catch (runtimeexception ex){
      system.out.println(ex.getmessage());
    }
    return usernew;
  }

  @requestmapping("/delete/{id}")
  @responsebody
  public void getuserbyid(@pathvariable("id")int id){
    this.userservice.deleteuser(id);
  }


}

8.注入jdbctemplate和transactiontemplate,使用传统方式操作数据库，更加灵活，方法如下

@autowired
  private jdbctemplate jdbctemplate;

  @autowired
  private transactiontemplate transactiontemplate;

  /**
   * 手动控制事物测试
   * @param throwex
   */
  @override
  public void testtransactionmanually(boolean throwex) {

    try {
      transactiontemplate.execute(new transactioncallback<boolean>() {

        /**
         * 事物代码
         *
         * @param transactionstatus 事物状态
         * @return 是否成功
         */
        @override
        public boolean dointransaction(transactionstatus transactionstatus) {
          user user = new user();
          user.setid(1);
          int a = new random().nextint(10); //0-9
          user.setnumber("10000u" + a);
          jdbctemplate.update("update user set number=? where id=?", new object[]{user.getnumber(), user.getid()}, new int[]{types.varchar, types.integer});
          if (throwex) {
            throw new runtimeexception("try throw exception"); //看看会不会回滚
          }
          return true;
        }
      });
    }catch (runtimeexception ex){
      system.out.println(ex.getmessage());
    }

  }

  /**
   * 手动执行jdbc测试
   */
  @override
  public void testjdbctemplate() {
    user user = new user();
    int a = new random().nextint(10); //0-9
    user.setnumber("10000i"+ a );
    user.setname("name"+a);
    this.jdbctemplate.update("insert into user(number,name )values (?,?)",user.getnumber(),user.getname());
  }

至此，我已经讲了三种方式（jpa两种+jdbctemplate）如何操作数据库了，你爱怎么用就怎么用，上述代码均是实践证明可行的！

以上这篇基于spring boot 1.5.4 集成 jpa+hibernate+jdbctemplate(详解)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。