hibernate還有必要學嗎，Hibernate 入門

?工具 idea?

maven + web

 <dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core --><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-core</artifactId><version>5.4.2.Final</version></dependency><!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator --><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-validator</artifactId><version>6.0.15.Final</version></dependency><!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-entitymanager --><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-entitymanager</artifactId><version>5.4.2.Final</version></dependency><!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-annotations --><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-annotations</artifactId><version>3.5.6-Final</version></dependency><!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-c3p0 --><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-c3p0</artifactId><version>5.4.3.Final</version></dependency><dependency><groupId>org.hibernate.javax.persistence</groupId><artifactId>hibernate-jpa-2.0-api</artifactId><version>1.0.0.Final</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.6.1</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.15</version></dependency></dependencies>

hibernate還有必要學嗎，

<!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration><session-factory ><!-- 1、配置數據庫連接的4個參數 --><property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property><property name="hibernate.connection.url">jdbc:mysql:///hibernate_day1?serverTimezone=GMT%2B8</property><property name="hibernate.connection.username">root</property><property name="hibernate.connection.password">root</property><!--  是否顯示sql語句 --><property name="show_sql">true</property><!--  是否格式化sql語句 --><property name="format_sql">true</property><!--  是否自動提交事務 --><property name="hibernate.connection.autocommit">true</property><!-- 2、配置JavaBean與表的映射文件 --><!--<mapping resource= "cn/edu/aynu/User.hbm.xml"/>--><mapping resource="User.hbm.xml"></mapping><!--<mapping class="cn/edu/aynu/User.hbm.xml"></mapping>--><!--<mapping package="cn/edu/aynu/User.hbm.xml"></mapping>--></session-factory>
</hibernate-configuration>

<!DOCTYPE hibernate-mapping PUBLIC"-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping><class name="cn.edu.aynu.User" table="t_user"><!-- 1、主鍵，如果屬性與表字段不一至，要指定column --><id name="uid" column="id"><!-- 主鍵生成策略  --><generator class="native"></generator></id><!-- 2、用戶字段 --><property name="username"></property><property name="password"></property></class>
</hibernate-mapping>

雖然報紅但是不影響使用

public class User {public int getUid() {return uid;}public void setUid(int uid) {this.uid = uid;}private int uid;private String username;private String password;public User() {}public User(String username, String password) {this.username = username;this.password = password;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}@Overridepublic String toString() {return "User{" +"username='" + username + '\'' +", password=" + password +'}';}
}

?運行結果

?