Mybatis(學習三)--增刪改查

1.創建maven項目
2.配置pom.xml文件

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.lq</groupId>
  <artifactId>Mybatis01</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>Mybatis01 Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <!-- 設置UTF-8編碼格式 -->
    <properties>
        <!-- 文件拷貝時的編碼 -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <!-- 編譯時的編碼 -->
        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
        <!-- 自定義常量，在依賴中可以通過${名字}的方式進行引用 -->
        <spring.version>4.3.14.RELEASE</spring.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>
        <!--顯示日誌-->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.25</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        </dependency>
        <!-- 單元測試配置 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <!-- jdk版本配置 -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

3.數據庫配置:database.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql:///mysql
username=root
password=root

4.mybatis配置文件:mybatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
    PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-config.dtd">  
<configuration>
    <!-- 分離配置 -->
    <properties resource="database.properties"/>
    <!-- 環境配置 -->
    <environments default="lq">
        <environment id="lq">
        <!-- 事務管理器的配置 -->
            <transactionManager type="JDBC"/>
            <!-- 基本信息配置 -->
            <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>
    <!-- 註冊映射元文件 -->
    <mappers>
        <mapper resource="com/lq/mapper/UserBeanMapper.xml"/>
    </mappers>
</configuration>

5.日誌輸出配置:log4j.properties

log4j.rootLogger=ALL, Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%m%n


log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
log4j.logger.java.sql.ResultSet=INFO

6.反向工程文件配置:generator.xml

<!DOCTYPE generatorConfiguration
  PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
  "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
    <context id="context1" targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressAllComments" value="true" />
            <property name="suppressDate" value="true" />
        </commentGenerator>
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
            connectionURL="jdbc:mysql:///mysql" userId="root" password="root">
        </jdbcConnection>
        <javaModelGenerator targetPackage="com.lq.entity"
            targetProject="Mybatis01">
            <property name="enableSubPackages" value="false" />
            <property name="trimStrings" value="false" />
        </javaModelGenerator>
        <sqlMapGenerator targetPackage="com.lq.mapper"
            targetProject="Mybatis01">
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>
        <javaClientGenerator type="XMLMAPPER"
            targetPackage="com.lq.dao" implementationPackage="com.lq.dao.impl"
            targetProject="Mybatis01">
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>
        <table tableName="t_users" domainObjectName="UserBean">
        </table>
    </context>

</generatorConfiguration>

7.反向生成的實體類:

package com.lq.entity;

import java.math.BigDecimal;
import java.util.Date;

public class UserBean {
    private Long id;

    private String username;

    private String password;

    private Date birth;

    private Boolean sex;

    private BigDecimal salary;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    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;
    }

    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }

    public Boolean getSex() {
        return sex;
    }

    public void setSex(Boolean sex) {
        this.sex = sex;
    }

    public BigDecimal getSalary() {
        return salary;
    }

    public void setSalary(BigDecimal salary) {
        this.salary = salary;
    }

    @Override
    public String toString() {
        return "UserBean [id=" + id + ", username=" + username + ", password=" + password + ", birth=" + birth
                + ", sex=" + sex + ", salary=" + salary + "]";
    }


}

package com.lq.entity;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class UserBeanExample {
    protected String orderByClause;

    protected boolean distinct;

    protected List<Criteria> oredCriteria;

    public UserBeanExample() {
        oredCriteria = new ArrayList<Criteria>();
    }

    public void setOrderByClause(String orderByClause) {
        this.orderByClause = orderByClause;
    }

    public String getOrderByClause() {
        return orderByClause;
    }

    public void setDistinct(boolean distinct) {
        this.distinct = distinct;
    }

    public boolean isDistinct() {
        return distinct;
    }

    public List<Criteria> getOredCriteria() {
        return oredCriteria;
    }

    public void or(Criteria criteria) {
        oredCriteria.add(criteria);
    }

    public Criteria or() {
        Criteria criteria = createCriteriaInternal();
        oredCriteria.add(criteria);
        return criteria;
    }

    public Criteria createCriteria() {
        Criteria criteria = createCriteriaInternal();
        if (oredCriteria.size() == 0) {
            oredCriteria.add(criteria);
        }
        return criteria;
    }

    protected Criteria createCriteriaInternal() {
        Criteria criteria = new Criteria();
        return criteria;
    }

    public void clear() {
        oredCriteria.clear();
        orderByClause = null;
        distinct = false;
    }

    protected abstract static class GeneratedCriteria {
        protected List<Criterion> criteria;

        protected GeneratedCriteria() {
            super();
            criteria = new ArrayList<Criterion>();
        }

        public boolean isValid() {
            return criteria.size() > 0;
        }

        public List<Criterion> getAllCriteria() {
            return criteria;
        }

        public List<Criterion> getCriteria() {
            return criteria;
        }

        protected void addCriterion(String condition) {
            if (condition == null) {
                throw new RuntimeException("Value for condition cannot be null");
            }
            criteria.add(new Criterion(condition));
        }

        protected void addCriterion(String condition, Object value, String property) {
            if (value == null) {
                throw new RuntimeException("Value for " + property + " cannot be null");
            }
            criteria.add(new Criterion(condition, value));
        }

        protected void addCriterion(String condition, Object value1, Object value2, String property) {
            if (value1 == null || value2 == null) {
                throw new RuntimeException("Between values for " + property + " cannot be null");
            }
            criteria.add(new Criterion(condition, value1, value2));
        }

        public Criteria andIdIsNull() {
            addCriterion("Id is null");
            return (Criteria) this;
        }

        public Criteria andIdIsNotNull() {
            addCriterion("Id is not null");
            return (Criteria) this;
        }

        public Criteria andIdEqualTo(Long value) {
            addCriterion("Id =", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdNotEqualTo(Long value) {
            addCriterion("Id <>", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdGreaterThan(Long value) {
            addCriterion("Id >", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdGreaterThanOrEqualTo(Long value) {
            addCriterion("Id >=", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdLessThan(Long value) {
            addCriterion("Id <", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdLessThanOrEqualTo(Long value) {
            addCriterion("Id <=", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdIn(List<Long> values) {
            addCriterion("Id in", values, "id");
            return (Criteria) this;
        }

        public Criteria andIdNotIn(List<Long> values) {
            addCriterion("Id not in", values, "id");
            return (Criteria) this;
        }

        public Criteria andIdBetween(Long value1, Long value2) {
            addCriterion("Id between", value1, value2, "id");
            return (Criteria) this;
        }

        public Criteria andIdNotBetween(Long value1, Long value2) {
            addCriterion("Id not between", value1, value2, "id");
            return (Criteria) this;
        }

        public Criteria andUsernameIsNull() {
            addCriterion("Username is null");
            return (Criteria) this;
        }

        public Criteria andUsernameIsNotNull() {
            addCriterion("Username is not null");
            return (Criteria) this;
        }

        public Criteria andUsernameEqualTo(String value) {
            addCriterion("Username =", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameNotEqualTo(String value) {
            addCriterion("Username <>", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameGreaterThan(String value) {
            addCriterion("Username >", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameGreaterThanOrEqualTo(String value) {
            addCriterion("Username >=", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameLessThan(String value) {
            addCriterion("Username <", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameLessThanOrEqualTo(String value) {
            addCriterion("Username <=", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameLike(String value) {
            addCriterion("Username like", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameNotLike(String value) {
            addCriterion("Username not like", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameIn(List<String> values) {
            addCriterion("Username in", values, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameNotIn(List<String> values) {
            addCriterion("Username not in", values, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameBetween(String value1, String value2) {
            addCriterion("Username between", value1, value2, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameNotBetween(String value1, String value2) {
            addCriterion("Username not between", value1, value2, "username");
            return (Criteria) this;
        }

        public Criteria andPasswordIsNull() {
            addCriterion("Password is null");
            return (Criteria) this;
        }

        public Criteria andPasswordIsNotNull() {
            addCriterion("Password is not null");
            return (Criteria) this;
        }

        public Criteria andPasswordEqualTo(String value) {
            addCriterion("Password =", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordNotEqualTo(String value) {
            addCriterion("Password <>", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordGreaterThan(String value) {
            addCriterion("Password >", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordGreaterThanOrEqualTo(String value) {
            addCriterion("Password >=", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordLessThan(String value) {
            addCriterion("Password <", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordLessThanOrEqualTo(String value) {
            addCriterion("Password <=", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordLike(String value) {
            addCriterion("Password like", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordNotLike(String value) {
            addCriterion("Password not like", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordIn(List<String> values) {
            addCriterion("Password in", values, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordNotIn(List<String> values) {
            addCriterion("Password not in", values, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordBetween(String value1, String value2) {
            addCriterion("Password between", value1, value2, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordNotBetween(String value1, String value2) {
            addCriterion("Password not between", value1, value2, "password");
            return (Criteria) this;
        }

        public Criteria andBirthIsNull() {
            addCriterion("Birth is null");
            return (Criteria) this;
        }

        public Criteria andBirthIsNotNull() {
            addCriterion("Birth is not null");
            return (Criteria) this;
        }

        public Criteria andBirthEqualTo(Date value) {
            addCriterion("Birth =", value, "birth");
            return (Criteria) this;
        }

        public Criteria andBirthNotEqualTo(Date value) {
            addCriterion("Birth <>", value, "birth");
            return (Criteria) this;
        }

        public Criteria andBirthGreaterThan(Date value) {
            addCriterion("Birth >", value, "birth");
            return (Criteria) this;
        }

        public Criteria andBirthGreaterThanOrEqualTo(Date value) {
            addCriterion("Birth >=", value, "birth");
            return (Criteria) this;
        }

        public Criteria andBirthLessThan(Date value) {
            addCriterion("Birth <", value, "birth");
            return (Criteria) this;
        }

        public Criteria andBirthLessThanOrEqualTo(Date value) {
            addCriterion("Birth <=", value, "birth");
            return (Criteria) this;
        }

        public Criteria andBirthIn(List<Date> values) {
            addCriterion("Birth in", values, "birth");
            return (Criteria) this;
        }

        public Criteria andBirthNotIn(List<Date> values) {
            addCriterion("Birth not in", values, "birth");
            return (Criteria) this;
        }

        public Criteria andBirthBetween(Date value1, Date value2) {
            addCriterion("Birth between", value1, value2, "birth");
            return (Criteria) this;
        }

        public Criteria andBirthNotBetween(Date value1, Date value2) {
            addCriterion("Birth not between", value1, value2, "birth");
            return (Criteria) this;
        }

        public Criteria andSexIsNull() {
            addCriterion("Sex is null");
            return (Criteria) this;
        }

        public Criteria andSexIsNotNull() {
            addCriterion("Sex is not null");
            return (Criteria) this;
        }

        public Criteria andSexEqualTo(Boolean value) {
            addCriterion("Sex =", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexNotEqualTo(Boolean value) {
            addCriterion("Sex <>", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexGreaterThan(Boolean value) {
            addCriterion("Sex >", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexGreaterThanOrEqualTo(Boolean value) {
            addCriterion("Sex >=", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexLessThan(Boolean value) {
            addCriterion("Sex <", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexLessThanOrEqualTo(Boolean value) {
            addCriterion("Sex <=", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexIn(List<Boolean> values) {
            addCriterion("Sex in", values, "sex");
            return (Criteria) this;
        }

        public Criteria andSexNotIn(List<Boolean> values) {
            addCriterion("Sex not in", values, "sex");
            return (Criteria) this;
        }

        public Criteria andSexBetween(Boolean value1, Boolean value2) {
            addCriterion("Sex between", value1, value2, "sex");
            return (Criteria) this;
        }

        public Criteria andSexNotBetween(Boolean value1, Boolean value2) {
            addCriterion("Sex not between", value1, value2, "sex");
            return (Criteria) this;
        }

        public Criteria andSalaryIsNull() {
            addCriterion("Salary is null");
            return (Criteria) this;
        }

        public Criteria andSalaryIsNotNull() {
            addCriterion("Salary is not null");
            return (Criteria) this;
        }

        public Criteria andSalaryEqualTo(BigDecimal value) {
            addCriterion("Salary =", value, "salary");
            return (Criteria) this;
        }

        public Criteria andSalaryNotEqualTo(BigDecimal value) {
            addCriterion("Salary <>", value, "salary");
            return (Criteria) this;
        }

        public Criteria andSalaryGreaterThan(BigDecimal value) {
            addCriterion("Salary >", value, "salary");
            return (Criteria) this;
        }

        public Criteria andSalaryGreaterThanOrEqualTo(BigDecimal value) {
            addCriterion("Salary >=", value, "salary");
            return (Criteria) this;
        }

        public Criteria andSalaryLessThan(BigDecimal value) {
            addCriterion("Salary <", value, "salary");
            return (Criteria) this;
        }

        public Criteria andSalaryLessThanOrEqualTo(BigDecimal value) {
            addCriterion("Salary <=", value, "salary");
            return (Criteria) this;
        }

        public Criteria andSalaryIn(List<BigDecimal> values) {
            addCriterion("Salary in", values, "salary");
            return (Criteria) this;
        }

        public Criteria andSalaryNotIn(List<BigDecimal> values) {
            addCriterion("Salary not in", values, "salary");
            return (Criteria) this;
        }

        public Criteria andSalaryBetween(BigDecimal value1, BigDecimal value2) {
            addCriterion("Salary between", value1, value2, "salary");
            return (Criteria) this;
        }

        public Criteria andSalaryNotBetween(BigDecimal value1, BigDecimal value2) {
            addCriterion("Salary not between", value1, value2, "salary");
            return (Criteria) this;
        }
    }

    public static class Criteria extends GeneratedCriteria {

        protected Criteria() {
            super();
        }
    }

    public static class Criterion {
        private String condition;

        private Object value;

        private Object secondValue;

        private boolean noValue;

        private boolean singleValue;

        private boolean betweenValue;

        private boolean listValue;

        private String typeHandler;

        public String getCondition() {
            return condition;
        }

        public Object getValue() {
            return value;
        }

        public Object getSecondValue() {
            return secondValue;
        }

        public boolean isNoValue() {
            return noValue;
        }

        public boolean isSingleValue() {
            return singleValue;
        }

        public boolean isBetweenValue() {
            return betweenValue;
        }

        public boolean isListValue() {
            return listValue;
        }

        public String getTypeHandler() {
            return typeHandler;
        }

        protected Criterion(String condition) {
            super();
            this.condition = condition;
            this.typeHandler = null;
            this.noValue = true;
        }

        protected Criterion(String condition, Object value, String typeHandler) {
            super();
            this.condition = condition;
            this.value = value;
            this.typeHandler = typeHandler;
            if (value instanceof List<?>) {
                this.listValue = true;
            } else {
                this.singleValue = true;
            }
        }

        protected Criterion(String condition, Object value) {
            this(condition, value, null);
        }

        protected Criterion(String condition, Object value, Object secondValue, String typeHandler) {
            super();
            this.condition = condition;
            this.value = value;
            this.secondValue = secondValue;
            this.typeHandler = typeHandler;
            this.betweenValue = true;
        }

        protected Criterion(String condition, Object value, Object secondValue) {
            this(condition, value, secondValue, null);
        }
    }
}

8.反向生成的接口

package com.lq.dao;

import com.lq.entity.UserBean;
import com.lq.entity.UserBeanExample;
import java.util.List;
import org.apache.ibatis.annotations.Param;

public interface UserBeanMapper {
    int countByExample(UserBeanExample example);

    int deleteByExample(UserBeanExample example);

    int deleteByPrimaryKey(Long id);

    int insert(UserBean record);

    int insertSelective(UserBean record);

    List<UserBean> selectByExample(UserBeanExample example);

    UserBean selectByPrimaryKey(Long id);

    int updateByExampleSelective(@Param("record") UserBean record, @Param("example") UserBeanExample example);

    int updateByExample(@Param("record") UserBean record, @Param("example") UserBeanExample example);

    int updateByPrimaryKeySelective(UserBean record);

    int updateByPrimaryKey(UserBean record);
}

9.反向生成的映射文件:UserBeanMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.lq.dao.UserBeanMapper" >
  <resultMap id="BaseResultMap" type="com.lq.entity.UserBean" >
    <id column="Id" property="id" jdbcType="BIGINT" />
    <result column="Username" property="username" jdbcType="VARCHAR" />
    <result column="Password" property="password" jdbcType="VARCHAR" />
    <result column="Birth" property="birth" jdbcType="TIMESTAMP" />
    <result column="Sex" property="sex" jdbcType="BIT" />
    <result column="Salary" property="salary" jdbcType="DECIMAL" />
  </resultMap>
  <sql id="Example_Where_Clause" >
    <where >
      <foreach collection="oredCriteria" item="criteria" separator="or" >
        <if test="criteria.valid" >
          <trim prefix="(" suffix=")" prefixOverrides="and" >
            <foreach collection="criteria.criteria" item="criterion" >
              <choose >
                <when test="criterion.noValue" >
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue" >
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue" >
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue" >
                  and ${criterion.condition}
                  <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Update_By_Example_Where_Clause" >
    <where >
      <foreach collection="example.oredCriteria" item="criteria" separator="or" >
        <if test="criteria.valid" >
          <trim prefix="(" suffix=")" prefixOverrides="and" >
            <foreach collection="criteria.criteria" item="criterion" >
              <choose >
                <when test="criterion.noValue" >
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue" >
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue" >
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue" >
                  and ${criterion.condition}
                  <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Base_Column_List" >
    Id, Username, Password, Birth, Sex, Salary
  </sql>
  <select id="selectByExample" resultMap="BaseResultMap" parameterType="com.lq.entity.UserBeanExample" >
    select
    <if test="distinct" >
      distinct
    </if>
    <include refid="Base_Column_List" />
    from t_users
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
    <if test="orderByClause != null" >
      order by ${orderByClause}
    </if>
  </select>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Long" >
    select 
    <include refid="Base_Column_List" />
    from t_users
    where Id = #{id,jdbcType=BIGINT}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Long" >
    delete from t_users
    where Id = #{id,jdbcType=BIGINT}
  </delete>
  <delete id="deleteByExample" parameterType="com.lq.entity.UserBeanExample" >
    delete from t_users
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
  </delete>
  <insert id="insert" parameterType="com.lq.entity.UserBean" >
    insert into t_users (Id, Username, Password, 
      Birth, Sex, Salary)
    values (#{id,jdbcType=BIGINT}, #{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, 
      #{birth,jdbcType=TIMESTAMP}, #{sex,jdbcType=BIT}, #{salary,jdbcType=DECIMAL})
  </insert>
  <insert id="insertSelective" parameterType="com.lq.entity.UserBean" >
    insert into t_users
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        Id,
      </if>
      <if test="username != null" >
        Username,
      </if>
      <if test="password != null" >
        Password,
      </if>
      <if test="birth != null" >
        Birth,
      </if>
      <if test="sex != null" >
        Sex,
      </if>
      <if test="salary != null" >
        Salary,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        #{id,jdbcType=BIGINT},
      </if>
      <if test="username != null" >
        #{username,jdbcType=VARCHAR},
      </if>
      <if test="password != null" >
        #{password,jdbcType=VARCHAR},
      </if>
      <if test="birth != null" >
        #{birth,jdbcType=TIMESTAMP},
      </if>
      <if test="sex != null" >
        #{sex,jdbcType=BIT},
      </if>
      <if test="salary != null" >
        #{salary,jdbcType=DECIMAL},
      </if>
    </trim>
  </insert>
  <select id="countByExample" parameterType="com.lq.entity.UserBeanExample" resultType="java.lang.Integer" >
    select count(*) from t_users
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
  </select>
  <update id="updateByExampleSelective" parameterType="map" >
    update t_users
    <set >
      <if test="record.id != null" >
        Id = #{record.id,jdbcType=BIGINT},
      </if>
      <if test="record.username != null" >
        Username = #{record.username,jdbcType=VARCHAR},
      </if>
      <if test="record.password != null" >
        Password = #{record.password,jdbcType=VARCHAR},
      </if>
      <if test="record.birth != null" >
        Birth = #{record.birth,jdbcType=TIMESTAMP},
      </if>
      <if test="record.sex != null" >
        Sex = #{record.sex,jdbcType=BIT},
      </if>
      <if test="record.salary != null" >
        Salary = #{record.salary,jdbcType=DECIMAL},
      </if>
    </set>
    <if test="_parameter != null" >
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <update id="updateByExample" parameterType="map" >
    update t_users
    set Id = #{record.id,jdbcType=BIGINT},
      Username = #{record.username,jdbcType=VARCHAR},
      Password = #{record.password,jdbcType=VARCHAR},
      Birth = #{record.birth,jdbcType=TIMESTAMP},
      Sex = #{record.sex,jdbcType=BIT},
      Salary = #{record.salary,jdbcType=DECIMAL}
    <if test="_parameter != null" >
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <update id="updateByPrimaryKeySelective" parameterType="com.lq.entity.UserBean" >
    update t_users
    <set >
      <if test="username != null" >
        Username = #{username,jdbcType=VARCHAR},
      </if>
      <if test="password != null" >
        Password = #{password,jdbcType=VARCHAR},
      </if>
      <if test="birth != null" >
        Birth = #{birth,jdbcType=TIMESTAMP},
      </if>
      <if test="sex != null" >
        Sex = #{sex,jdbcType=BIT},
      </if>
      <if test="salary != null" >
        Salary = #{salary,jdbcType=DECIMAL},
      </if>
    </set>
    where Id = #{id,jdbcType=BIGINT}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.lq.entity.UserBean" >
    update t_users
    set Username = #{username,jdbcType=VARCHAR},
      Password = #{password,jdbcType=VARCHAR},
      Birth = #{birth,jdbcType=TIMESTAMP},
      Sex = #{sex,jdbcType=BIT},
      Salary = #{salary,jdbcType=DECIMAL}
    where Id = #{id,jdbcType=BIGINT}
  </update>
</mapper>

10.工具類:MybatisSessionFactory

package com.lq.util;

import java.io.Reader;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class MybatisSessionFactory {
    private MybatisSessionFactory(){

    }
    private static SqlSessionFactory factory;
    private final static ThreadLocal<SqlSession>ts = new ThreadLocal<>();

    static{
          try {
              //解析xml文件並創建SqlSessionFactory對象
            Reader reader = Resources.getResourceAsReader("mybatis-config.xml");
            factory = new SqlSessionFactoryBuilder().build(reader);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static <T>T getMapper(Class<T>clazz){
        SqlSession session=getSession();
        if(session != null)
            return session.getMapper(clazz);
        return null;
    }
    //提交事務
    public static void commitTransaction(){
        SqlSession ss =ts.get();
        if(ss!= null)
            ss.commit();
    }
    //事務回滾
    public static void rollbackTransaction(){
        SqlSession ss = ts.get();
        if(ss!= null)
            ss.rollback();
    }

    public static SqlSession getSession() {
        SqlSession ss =ts.get();
        if(ss == null){
            ss=factory != null ? factory.openSession():null;
            ts.set(ss);
        }
        return ss;
    }
    public static void closeSession(){
            SqlSession ss = ts.get();
            ts.set(null);
            if(ss!=null)
                ss.close();
    }

    public static SqlSessionFactory getFactory(){
        return factory;
    }
}

11.測試類

package com.lq.test;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class ConnTest {
    public static void main(String[] args) throws IOException {
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory sf = new SqlSessionFactoryBuilder().build(is);
        SqlSession session = sf.openSession();
        Connection conn = session.getConnection();
        System.out.println(conn);
    }

}

package com.lq.test;

import static org.junit.Assert.*;

import java.math.BigDecimal;
import java.util.List;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.lq.dao.UserBeanMapper;
import com.lq.entity.UserBean;
import com.lq.entity.UserBeanExample;
import com.lq.entity.UserBeanExample.Criteria;
import com.lq.util.MybatisSessionFactory;

public class Test1 {

    private UserBeanMapper userMapper;
    @Before
    public void setUp() throws Exception {
        MybatisSessionFactory.getSession();
        userMapper = MybatisSessionFactory.getMapper(UserBeanMapper.class);
    }

    @After
    public void tearDown() throws Exception {
        MybatisSessionFactory.commitTransaction();
        MybatisSessionFactory.closeSession();
    }
    @Test
    //增
    public void testSave() {
        UserBean user = new UserBean();
        user.setUsername("張三");
        user.setPassword("123456");
        user.setSalary(new BigDecimal(12345.34));
        int i = userMapper.insert(user);
        assertEquals(1, i);
    }

    @Test
    //刪
    public void testDel(){
        int i = userMapper.deleteByPrimaryKey(5L);
        assertEquals(1, i);
    }

    @Test
    //改
    public void testModify(){
        //先按照指定id加載對象
        UserBean userBean = userMapper.selectByPrimaryKey(7L);
        System.out.println(userBean);
        //修改非id屬性
        userBean.setSex(false);
        userBean.setUsername("王五");
        //執行修改動作
        int i = userMapper.updateByPrimaryKey(userBean);
        assertEquals(1,i);
    }

    @Test
    //查
    public void testGetByExample(){
        UserBeanExample example = new UserBeanExample();
        Criteria criteria = example.createCriteria();
        criteria.andUsernameLike("張%");
        criteria.andPasswordEqualTo("123456");
        criteria.andIdIsNotNull();
        List<UserBean> list = userMapper.selectByExample(example);
        for (UserBean userBean : list) {
            System.out.println(userBean);
        }
    }
    @Test
    public void testCountByExample(){
        UserBeanExample example = new UserBeanExample();
        Criteria criteria = example.createCriteria();
        criteria.andUsernameLike("張%");
        criteria.andPasswordEqualTo("123456");
        criteria.andIdIsNotNull();
        int count = userMapper.countByExample(example);
        System.out.println("滿足條件的行數爲:"+count);
    }
}