摘要:通過注解引入對象。添加一個使用接收請求添加賬號訪問層添加微服務啟動類鏈接數據庫通過編寫數據庫訪問。
SpringCloud(第 041 篇)鏈接Mysql數據庫,通過JdbcTemplate編寫數據庫訪問
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一、大致介紹1、前面章節提到了JPA操作訪問數據庫,本章節我們講解一下如何用JdbcTemplate操作訪問數據庫; 2、使用JdbcTemplate是一個相對更底層的操作,可以直接編寫sql語句操作數據,更具靈活性; 3、另外配置文件中的mysql數據庫配置,那么就得大家自己用自己的了哈;二、實現步驟 2.1 添加 maven 引用包
2.2 添加應用配置文件(springms-provider-user-mysql-jdbctemplatesrcmainresourcesapplication.yml)4.0.0 springms-provider-user-mysql-jdbctemplate 1.0-SNAPSHOT jar com.springms.cloud springms-spring-cloud 1.0-SNAPSHOT org.springframework.boot spring-boot-starter-data-jpa org.springframework.boot spring-boot-starter-web mysql mysql-connector-java
server: port: 8315 spring: application: name: springms-provider-user-mysql-jdbctemplate #全部小寫 ##################################################################################################### # mysql 屬性配置 datasource: driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://ip:3306/hmilyylimh username: username password: password jpa: hibernate: #ddl-auto: create #ddl-auto:設為create表示每次都重新建表 ddl-auto: update #ddl-auto:設為update表示每次都不會重新建表 show-sql: true ##################################################################################################### ##################################################################################################### # 打印日志 logging: level: root: INFO org.hibernate: INFO org.hibernate.type.descriptor.sql.BasicBinder: TRACE org.hibernate.type.descriptor.sql.BasicExtractor: TRACE com.springms: DEBUG #####################################################################################################2.3 添加實體用戶類User(springms-provider-user-mysql-jdbctemplate/src/main/java/com/springms/cloud/entity/User.java)
package com.springms.cloud.entity; public class User { private Long id; private String username; private String name; private Integer age; private String balance; public Long getId() { return this.id; } public void setId(Long id) { this.id = id; } public String getUsername() { return this.username; } public void setUsername(String username) { this.username = username; } public String getName() { return this.name; } public void setName(String name) { this.name = name; } public Integer getAge() { return this.age; } public void setAge(Integer age) { this.age = age; } public String getBalance() { return this.balance; } public void setBalance(String balance) { this.balance = balance; } @Override public String toString() { return "User{" + "id=" + id + ", username="" + username + """ + ", name="" + name + """ + ", age=" + age + ", balance="" + balance + """ + "}"; } }2.4 添加實體賬戶類Account(springms-provider-user-mysql-jdbctemplate/src/main/java/com/springms/cloud/entity/Account.java)
package com.springms.cloud.entity; public class Account { private int id ; private String name ; private double money; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public double getMoney() { return money; } public void setMoney(double money) { this.money = money; } @Override public String toString() { return "Account{" + "id=" + id + ", name="" + name + """ + ", money=" + money + "}"; } }2.5 添加用戶DAO接口(springms-provider-user-mysql-jdbctemplate/src/main/java/com/springms/cloud/dao/IUserDao.java)
package com.springms.cloud.dao; import com.springms.cloud.entity.User; import java.util.List; /** * 簡單用戶鏈接Mysql數據庫微服務(通過@Repository注解標注該類為持久化操作對象)。 * * @author hmilyylimh * * @version 0.0.1 * * @date 17/10/18 * */ public interface IUserDao { User findUserById(Long id); List2.6 添加賬號DAO接口(springms-provider-user-mysql-jdbctemplate/src/main/java/com/springms/cloud/dao/IAccountDao.java)findAllUsers(); int insertUser(User user); }
package com.springms.cloud.dao; import com.springms.cloud.entity.Account; import java.util.List; public interface IAccountDao { int add(Account account); int update(Account account); int delete(int id); Account findAccountById(int id); List2.7 添加用戶DAO接口實現類(springms-provider-user-mysql-jdbctemplate/src/main/java/com/springms/cloud/dao/impl/UserDaoImpl.java)findAccountList(); }
package com.springms.cloud.dao.impl; import com.springms.cloud.dao.IUserDao; import com.springms.cloud.entity.User; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.BeanPropertyRowMapper; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.RowMapper; import org.springframework.stereotype.Repository; import java.util.List; /** * 簡單用戶鏈接Mysql數據庫微服務(通過@Repository注解標注該類為持久化操作對象)。 * * @author hmilyylimh * * @version 0.0.1 * * @date 17/10/18 * */ @Repository public class UserDaoImpl implements IUserDao { /** * 通過@Resource注解引入JdbcTemplate對象。 */ @Autowired private JdbcTemplate jdbcTemplate; //@Transactional(readOnly = true) @Override public User findUserById(Long id){ // 1. 定義一個sql語句 String querySQL = "select * from user where id = ?"; // 2. 定義一個RowMapper RowMapper2.8 添加賬號DAO接口實現類(springms-provider-user-mysql-jdbctemplate/src/main/java/com/springms/cloud/dao/impl/AccountDaoImpl.java)rowMapper = new BeanPropertyRowMapper (User.class); // 3. 執行查詢方法 //List list = jdbcTemplate.query("select * from account where id = ?", new Object[]{id}, new BeanPropertyRowMapper(User.class)); User user = jdbcTemplate.queryForObject(querySQL, new Object[]{id}, rowMapper); return user; } //@Transactional(readOnly = true) @Override public List findAllUsers(){ // 1. 定義一個sql語句 String querySQL = "select * from user"; // 2. 定義一個RowMapper RowMapper rowMapper = new BeanPropertyRowMapper (User.class); // 3. 執行查詢方法 List users = jdbcTemplate.query(querySQL, new Object[]{}, rowMapper); return users; } @Override public int insertUser(User user) { // 1. 定義一個sql語句 String execSQL = "INSERT into user (username, name, age, balance) values (?, ?, ?, ?)"; // 2. 執行查詢方法 return jdbcTemplate.update(execSQL, new Object[]{user.getUsername(), user.getName(), user.getAge(), user.getBalance()}); } }
package com.springms.cloud.dao.impl; import com.springms.cloud.dao.IAccountDao; import com.springms.cloud.entity.Account; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.BeanPropertyRowMapper; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.stereotype.Repository; import java.util.List; @Repository public class AccountDaoImpl implements IAccountDao { @Autowired private JdbcTemplate jdbcTemplate; @Override public int add(Account account) { return jdbcTemplate.update("insert into account(name, money) values(?, ?)", account.getName(),account.getMoney()); } @Override public int update(Account account) { return jdbcTemplate.update("UPDATE account SET NAME=? ,money=? WHERE id=?", account.getName(),account.getMoney(),account.getId()); } @Override public int delete(int id) { return jdbcTemplate.update("DELETE from TABLE account where id=?",id); } @Override public Account findAccountById(int id) { List2.9 添加用戶Service接口(springms-provider-user-mysql-jdbctemplate/src/main/java/com/springms/cloud/service/IUserService.java)list = jdbcTemplate.query("select * from account where id = ?", new Object[]{id}, new BeanPropertyRowMapper(Account.class)); if(list!=null && list.size()>0){ Account account = list.get(0); return account; }else{ return null; } } @Override public List findAccountList() { List list = jdbcTemplate.query("select * from account", new Object[]{}, new BeanPropertyRowMapper(Account.class)); if(list!=null && list.size()>0){ return list; }else{ return null; } } }
package com.springms.cloud.service; import com.springms.cloud.entity.User; import java.util.List; /** * 簡單用戶鏈接Mysql數據庫微服務(通過@Service注解標注該類為持久化操作對象)。 * * @author hmilyylimh * * @version 0.0.1 * * @date 17/10/18 * */ public interface IUserService { User findUserById(Long id); List2.10 添加賬號Service接口(springms-provider-user-mysql-jdbctemplate/src/main/java/com/springms/cloud/service/IAccountService.java)findAllUsers(); int insertUser(User user); }
package com.springms.cloud.service; import com.springms.cloud.entity.Account; import java.util.List; public interface IAccountService { int add(Account account); int update(Account account); int delete(int id); Account findAccountById(int id); List2.11 添加用戶Service接口實現類(springms-provider-user-mysql-jdbctemplate/src/main/java/com/springms/cloud/service/impl/UserServiceImpl.java)findAccountList(); }
package com.springms.cloud.service.impl; import com.springms.cloud.dao.IUserDao; import com.springms.cloud.entity.User; import com.springms.cloud.service.IUserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; /** * 簡單用戶鏈接Mysql數據庫微服務(通過@Service注解標注該類為持久化操作對象)。 * * @author hmilyylimh * * @version 0.0.1 * * @date 17/10/18 * */ @Service public class UserServiceImpl implements IUserService { @Autowired private IUserDao userDao; @Override public User findUserById(Long id){ return userDao.findUserById(id); } @Override public List2.12 添加賬號Service接口實現類(springms-provider-user-mysql-jdbctemplate/src/main/java/com/springms/cloud/service/impl/AccountServiceImpl.java)findAllUsers(){ return userDao.findAllUsers(); } @Override public int insertUser(User user) { return userDao.insertUser(user); } }
package com.springms.cloud.service.impl; import com.springms.cloud.dao.IAccountDao; import com.springms.cloud.entity.Account; import com.springms.cloud.service.IAccountService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; @Service public class AccountServiceImpl implements IAccountService { @Autowired IAccountDao accountDAO; @Override public int add(Account account) { return accountDAO.add(account); } @Override public int update(Account account) { return accountDAO.update(account); } @Override public int delete(int id) { return accountDAO.delete(id); } @Override public Account findAccountById(int id) { return accountDAO.findAccountById(id); } @Override public List2.13 添加用戶Web訪問層Controller(springms-provider-user-mysql-crudrepository/src/main/java/com/springms/cloud/controller/ProviderUserMysqlCrudRepoController.java)findAccountList() { return accountDAO.findAccountList(); } }
package com.springms.cloud.controller; import com.springms.cloud.service.IUserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import com.springms.cloud.entity.User; import java.util.List; /** * 用戶微服務Controller。 * * @author hmilyylimh * * @version 0.0.1 * * @date 17/10/18 * */ @RestController public class ProviderUserMysqlJdbcController { @Autowired private IUserService userService; @GetMapping("/simplejdbc/{id}") public User findUserById(@PathVariable Long id) { return this.userService.findUserById(id); } @GetMapping("/simplejdbc/list") public List2.14 添加賬號Web訪問層Controller(springms-provider-user-mysql-crudrepository/src/main/java/com/springms/cloud/controller/ProviderUserMysqlCrudRepoController.java)findAllUsers() { return this.userService.findAllUsers(); } /** * 添加一個student,使用postMapping接收post請求 * * http://localhost:8315/simple/addUser?username=user11&age=11&balance=11 * * @return */ @PostMapping("/simplejdbc/addUser") public User insertUser(@RequestParam(value = "username", required=false) String username, @RequestParam(value = "age", required=false) Integer age, @RequestParam(value = "balance", required=false) String balance){ User user=new User(); user.setUsername(username); user.setName(username); user.setAge(age); user.setBalance(balance); int result = userService.insertUser(user); if(result > 0){ return user; } user.setId(0L); user.setName(null); user.setUsername(null); user.setBalance(null); return user; } }
package com.springms.cloud.controller; import com.springms.cloud.entity.Account; import com.springms.cloud.service.IAccountService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import java.util.List; @RestController @RequestMapping("/account") public class AccountController { @Autowired IAccountService accountService; @RequestMapping(value = "/list",method = RequestMethod.GET) public List2.15 添加微服務啟動類(springms-provider-user-mysql-crudrepository/src/main/java/com/springms/cloud/MsProviderUserMysqlCrudRepoApplication.java)getAccounts(){ return accountService.findAccountList(); } @RequestMapping(value = "/{id}",method = RequestMethod.GET) public Account getAccountById(@PathVariable("id") int id){ return accountService.findAccountById(id); } @RequestMapping(value = "/{id}",method = RequestMethod.PUT) public String updateAccount(@PathVariable("id")int id , @RequestParam(value = "name",required = true)String name, @RequestParam(value = "money" ,required = true)double money){ Account account=new Account(); account.setMoney(money); account.setName(name); account.setId(id); int t=accountService.update(account); if(t==1){ return account.toString(); }else { return "fail"; } } @RequestMapping(value = "",method = RequestMethod.POST) public String postAccount( @RequestParam(value = "name")String name, @RequestParam(value = "money" )double money){ Account account=new Account(); account.setMoney(money); account.setName(name); int t= accountService.add(account); if(t==1){ return account.toString(); }else { return "fail"; } } }
package com.springms.cloud; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; /** * 鏈接Mysql數據庫,通過JdbcTemplate編寫數據庫訪問。 * * @author hmilyylimh * * @version 0.0.1 * * @date 17/10/18 * */ @SpringBootApplication public class MsProviderUserMysqlJdbcApplication { public static void main(String[] args) { SpringApplication.run(MsProviderUserMysqlJdbcApplication.class, args); System.out.println("【【【【【【 鏈接MysqlJdbc數據庫微服務 】】】】】】已啟動."); } }三、測試
/**************************************************************************************** 一、簡單用戶鏈接Mysql數據庫微服務(通過JdbcTemplate編寫數據訪問): 1、啟動 springms-provider-user-mysql-jdbctemplate 模塊服務,啟動1個端口; 2、在瀏覽器輸入地址 http://localhost:8315/simplejdbc/6 可以看到用戶ID=10的信息成功的被打印出來; 3、使用 IDEA 自帶工具 Test Restful WebService 發送 HTTP POST 請求,并添加 username、age、balance三個參數,然后執行請求,并去 mysql 數據庫查看數據是否存在,正常情況下 mysql 數據庫剛剛插入的數據成功了: 4、使用 REST Client 執行 "/simplejdbc/list" 接口,也正常將 mysql 數據庫中所有的用戶信息打印出來了; 5、然后再操作 http://localhost:8315/account/ 該鏈接的接口操作,也是可以正常操作訪問的; ****************************************************************************************/四、下載地址
https://gitee.com/ylimhhmily/SpringCloudTutorial.git
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