Mybatis动态SQL（狂神说学习笔记）29道练习题
以下代码分为工具类、几个配置文件（mybatis-config.xml）、实体类、持久层（mapper映射文件）、测试类，代码我自己写完全部运行一遍，没有BUG。
一、 工具类
MybatisUtils
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.InputStream;
/**
获得 SqlSession 的实例
*/
public class MybatisUtils {
//既然有了 SqlSessionFactory，顾名思义，我们可以从中获得 SqlSession 的实例.
// SqlSession 提供了在数据库执行 SQL 命令所需的所有方法。
public static SqlSession getSqlSession(){
InputStream inputStream = null;
try {
String resource = "mybatis-config.xml";
inputStream = Resources.getResourceAsStream(resource);
} catch (IOException e) {
e.printStackTrace();
}
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
return sqlSessionFactory.openSession(true);//默认提交事务，这样可以省略sqlSession.commit()该提交事务的代码
}
}
二、 配置文件：
配置文件和Mapper映射文件需要注意一点：如果出现中文注释引起程序出现异常的问题，我是把文件中的第一行的代码改成了“encoding=“utf8””，原本代码是设置UTF-8。
mybatis-config.xml
<?xml version="1.0" encoding="utf8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<properties resource="db.properties"/>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
<typeAliases>
<!-- 这里需要根据每个人创建的包名去修改 -->
<package name="com.hwx.pojo"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<!-- 这里也需要根据每个人创建的包名去修改 -->
<mapper class="com.hwx.dao.user.UserMapper"/>
<mapper class="com.hwx.dao.role.RoleMapper"/>
<mapper class="com.hwx.dao.provider.ProviderMapper"/>
<mapper class="com.hwx.dao.bill.BillMapper"/>
</mappers>
</configuration>
db.properties:这里根据自己设置的账号密码数据库名字去修改
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/smbms?useSSL=false&useUnicode=true&characterEncoding=UTF-8
username=root
password=123456
log4j.properties:
#将等级为DEBUG的日志信息输出到console和file这两个目的地，console和file的定义在下面的代码
log4j.rootLogger=DEBUG,console,file
#控制台输出的相关设置
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%c]-%m%n
#文件输出的相关设置
log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./log/rzp.log
log4j.appender.file.MaxFileSize=10mb
log4j.appender.file.Threshold=DEBUG
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n
#日志输出级别
log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sq1.PreparedStatement=DEBUG
三、 实体类：
User类
package com.hwx.pojo;
import java.io.Serializable;
import java.util.Date;
/*
*用户
*/
public class User implements Serializable {
//id
private Integer id;
//用户编码
private String userCode;
//用户名
private String userName;
//用户密码
private String userPassword;
//性别
private Integer gender;
//出生日期
private Date birthday;
//电话
private String phone;
//地址
private String address;
//用户角色
private Integer userRole;
//创建者
private Integer createdBy;
//创建时间
private Date creationDate;
//更新者
private Integer modifyBy;
//更新时间
private Date modifyDate;
//年龄
private Integer age;
//用户角色名称
private String userRoleName;
public User() {
}
public User(Integer id, String userCode, String userName, String userPassword, Integer gender, Date birthday, String phone, String address, Integer userRole, Integer createdBy, Date creationDate, Integer modifyBy, Date modifyDate, Integer age, String userRoleName) {
this.id = id;
this.userCode = userCode;
this.userName = userName;
this.userPassword = userPassword;
this.gender = gender;
this.birthday = birthday;
this.phone = phone;
this.address = address;
this.userRole = userRole;
this.createdBy = createdBy;
this.creationDate = creationDate;
this.modifyBy = modifyBy;
this.modifyDate = modifyDate;
this.age = age;
this.userRoleName = userRoleName;
}
public User(Integer id, String userCode, String userName, String userPassword,
Integer gender, Date birthday, String phone, String address,
Integer userRole, Integer createdBy, Date creationDate) {
this.id = id;
this.userCode = userCode;
this.userName = userName;
this.userPassword = userPassword;
this.gender = gender;
this.birthday = birthday;
this.phone = phone;
this.address = address;
this.userRole = userRole;
this.createdBy = createdBy;
this.creationDate = creationDate;
}
public Integer getAge() {
/*Long time = System.currentTimeMillis( ) -birthday. getTime();
Integer age = Long.valueof(time/365/24/60/60/1ee0).IntegerVaLue();*/
Date date = new Date();
Integer age = date.getYear()-birthday.getYear();
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getUserRoleName() {
return userRoleName;
}
public void setUserRoleName(String userRoleName) {
this.userRoleName = userRoleName;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUserCode() {
return userCode;
}
public void setUserCode(String userCode) {
this.userCode = userCode;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPassword() {
return userPassword;
}
public void setUserPassword(String userPassword) {
this.userPassword = userPassword;
}
public Integer getGender() {
return gender;
}
public void setGender(Integer gender) {
this.gender = gender;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Integer getUserRole() {
return userRole;
}
public void setUserRole(Integer userRole) {
this.userRole = userRole;
}
public Integer getCreatedBy() {
return createdBy;
}
public void setCreatedBy(Integer createdBy) {
this.createdBy = createdBy;
}
public Date getCreationDate() {
return creationDate;
}
public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}
public Integer getModifyBy() {
return modifyBy;
}
public void setModifyBy(Integer modifyBy) {
this.modifyBy = modifyBy;
}
public Date getModifyDate() {
return modifyDate;
}
public void setModifyDate(Date modifyDate) {
this.modifyDate = modifyDate;
}
}
Role类
package com.hwx.pojo;
import java.util.Date;
/*
*角色
*/
public class Role {
//id
private Integer id;
//角色编码
private String roleCode;
//角色名称
private String roleName;
//创建者
private Integer createdBy;
//创建时间
private Date creationDate;
//更新者
private Integer modifyBy;
//更新时间
private Date modifyDate;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getRoleCode() {
return roleCode;
}
public void setRoleCode(String roleCode) {
this.roleCode = roleCode;
}
public String getRoleName() {
return roleName;
}
public void setRoleName(String roleName) {
this.roleName = roleName;
}
public Integer getCreatedBy() {
return createdBy;
}
public void setCreatedBy(Integer createdBy) {
this.createdBy = createdBy;
}
public Date getCreationDate() {
return creationDate;
}
public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}
public Integer getModifyBy() {
return modifyBy;
}
public void setModifyBy(Integer modifyBy) {
this.modifyBy = modifyBy;
}
public Date getModifyDate() {
return modifyDate;
}
public void setModifyDate(Date modifyDate) {
this.modifyDate = modifyDate;
}
}
Provider类
package com.hwx.pojo;
import java.util.Date;
/*
*供应商
*/
public class Provider {
private Integer id; //id
private String proCode; //供应商编码
private String proName; //供应商名称
private String proDesc; //供应商描述
private String proContact; //供应商联系人
private String proPhone; //供应商电话
private String proAddress; //供应商地址
private String proFax; //供应商传真
private Integer createdBy; //创建者
private Date creationDate; //创建时间
private Integer modifyBy; //更新者
private Date modifyDate;//更新时间
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getProCode() {
return proCode;
}
public void setProCode(String proCode) {
this.proCode = proCode;
}
public String getProName() {
return proName;
}
public void setProName(String proName) {
this.proName = proName;
}
public String getProDesc() {
return proDesc;
}
public void setProDesc(String proDesc) {
this.proDesc = proDesc;
}
public String getProContact() {
return proContact;
}
public void setProContact(String proContact) {
this.proContact = proContact;
}
public String getProPhone() {
return proPhon
