Mybatis代码生成器Mybatis-Generator使用详解

<dependency>
    <groupId>org.mybatis.generator</groupId>
    <artifactId>mybatis-generator-core</artifactId>
    <version>1.4.0</version>
</dependency>

List<String> warnings = new ArrayList<>();
// 如果已经存在生成过的文件是否进行覆盖
boolean overwrite = true;
File configFile = new File("ClassPath路径/generator-configuration.xml");
ConfigurationParser cp = new ConfigurationParser(warnings);
Configuration config = cp.parseConfiguration(configFile);
DefaultShellCallback callback = new DefaultShellCallback(overwrite);
MyBatisGenerator generator = new MyBatisGenerator(config, callback, warnings);
generator.generate(null);

<plugins>
    <plugin>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-maven-plugin</artifactId>
        <version>1.4.0</version>
        <executions>
            <execution>
                <id>Generate MyBatis Artifacts</id>
                <goals>
                    <goal>generate</goal>
                </goals>
            </execution>
        </executions>
        <configuration>
            <!-- 输出详细信息 -->
            <verbose>true</verbose>
            <!-- 覆盖生成文件 -->
            <overwrite>true</overwrite>
            <!-- 定义配置文件 -->
            <configurationFile>${basedir}/src/main/resources/generator-configuration.xml</configurationFile>
        </configuration>
    </plugin>
</plugins>

mvn mybatis-generator:generate

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
  PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
  "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>

  <properties resource="db.properties"/>

  <classPathEntry location="/Program Files/IBM/SQLLIB/java/db2java.zip" />

  <context id="DB2Tables" targetRuntime="MyBatis3">

    <jdbcConnection driverClass="COM.ibm.db2.jdbc.app.DB2Driver"
        connectionURL="jdbc:db2:TEST"
        userId="db2admin"
        password="db2admin">
    </jdbcConnection>

    <plugin type="org.mybatis.generator.plugins.SerializablePlugin"/>

    <commentGenerator>
        <property name="suppressDate" value="true"/>
        <property name="suppressAllComments" value="true"/>
    </commentGenerator>

    <javaTypeResolver>
      <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>

    <javaModelGenerator targetPackage="test.model" targetProject="\MBGTestProject\src">
      <property name="enableSubPackages" value="true" />
      <property name="trimStrings" value="true" />
    </javaModelGenerator>

    <sqlMapGenerator targetPackage="test.xml"  targetProject="\MBGTestProject\src">
      <property name="enableSubPackages" value="true" />
    </sqlMapGenerator>

    <javaClientGenerator type="XMLMAPPER" targetPackage="test.dao"  targetProject="\MBGTestProject\src">
      <property name="enableSubPackages" value="true" />
    </javaClientGenerator>

    <table schema="DB2ADMIN" tableName="ALLTYPES" domainObjectName="Customer" >
      <property name="useActualColumnNames" value="true"/>
      <generatedKey column="ID" sqlStatement="DB2" identity="true" />
      <columnOverride column="DATE_FIELD" property="startDate" />
      <ignoreColumn column="FRED" />
      <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" />
    </table>

  </context>
</generatorConfiguration>

<context id="default" targetRuntime="MyBatis3">

BIGINT --> Long
BIT --> Boolean
INTEGER --> Integer
SMALLINT --> Short
TINYINT --> Byte
......

public class DefaultJavaTypeResolver extends JavaTypeResolverDefaultImpl {

    public DefaultJavaTypeResolver() {
        super();
        typeMap.put(Types.SMALLINT, new JdbcTypeInformation("SMALLINT",
                new FullyQualifiedJavaType(Integer.class.getName())));
        typeMap.put(Types.TINYINT, new JdbcTypeInformation("TINYINT",
                new FullyQualifiedJavaType(Integer.class.getName())));
    }
}

<!-- column：指定主键列 -->
<!-- sqlStatement：查询主键的SQL语句，例如填写了MySql，则使用SELECT LAST_INSERT_ID() -->
<!-- type：可选值为pre或者post，pre指定selectKey标签的order为BEFORE，post指定selectKey标签的order为AFTER -->
<!-- identity：true的时候，指定selectKey标签的order为AFTER -->
<generatedKey column="id" sqlStatement="MySql" type="post" identity="true" />

<!-- searchString中正则命中的实体类名部分会替换为replaceString -->
<domainObjectRenamingRule searchString="^Sys" replaceString=""/>
<!-- 例如 SysUser会变成User -->
<!-- 例如 SysUserMapper会变成UserMapper -->

<!-- searchString中正则命中的列名部分会替换为replaceString -->
<columnRenamingRule searchString="^CUST_" replaceString=""/>
<!-- 例如 CUST_BUSINESS_NAME会变成BUSINESS_NAME（useActualColumnNames=true） -->
<!-- 例如 CUST_BUSINESS_NAME会变成businessName（useActualColumnNames=false） -->

<!-- column：指定要覆盖配置的列 -->
<!-- property：指定要覆盖配置的属性 -->
<!-- delimitedColumnName：是否为列名添加定界符，例如`{column}` -->
<!-- isGeneratedAlways：是否一定生成此列 -->
<columnOverride column="customer_name" property="customerName" javaType="" jdbcType="" typeHandler="" delimitedColumnName="" isGeneratedAlways="">
   <!-- 覆盖table或者javaModelGenerator级别的trimStrings属性配置 -->
   <property name="trimStrings" value="true"/>
<columnOverride/>

<ignoreColumn column="version" delimitedColumnName="false"/>

CREATE TABLE `t_order`
(
    id           BIGINT UNSIGNED PRIMARY KEY COMMENT '主键',
    order_id     VARCHAR(64)    NOT NULL COMMENT '订单ID',
    create_time  DATETIME       NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
    amount       DECIMAL(10, 2) NOT NULL DEFAULT 0 COMMENT '金额',
    order_status TINYINT        NOT NULL DEFAULT 0 COMMENT '订单状态',
    UNIQUE uniq_order_id (`order_id`)
) COMMENT '订单表';

mbg-sample
  - main
   - java
    - club
     - throwable
   - resources

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!-- 驱动包绝对路径 -->
    <classPathEntry
            location="I:\Develop\Maven-Repository\mysql\mysql-connector-java\5.1.48\mysql-connector-java-5.1.48.jar"/>

    <context id="default" targetRuntime="这里选择合适的引擎">

        <property name="javaFileEncoding" value="UTF-8"/>

        <!-- 不输出注释 -->
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/local"
                        userId="root"
                        password="root">
        </jdbcConnection>


        <!-- 不强制把所有的数字类型转化为BigDecimal -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <javaModelGenerator targetPackage="club.throwable.entity" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaModelGenerator>

        <sqlMapGenerator targetPackage="mappings" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <javaClientGenerator type="这里选择合适的Mapper类型" targetPackage="club.throwable.dao" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <table tableName="t_order"
               enableCountByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               enableUpdateByExample="false"
               domainObjectName="Order"
               mapperName="OrderMapper">
            <generatedKey column="id" sqlStatement="MySql"/>
        </table>
    </context>
</generatorConfiguration>

<dependency>
    <groupId>org.mybatis.dynamic-sql</groupId>
    <artifactId>mybatis-dynamic-sql</artifactId>
    <version>1.1.4</version>
</dependency>

<context id="default" targetRuntime="MyBatis3DynamicSql">
...

<javaClientGenerator type="ANNOTATEDMAPPER"
...

// club.throwable.entity
public class Order {
    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    private Long id;

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    private String orderId;

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    private Date createTime;

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    private BigDecimal amount;

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    private Byte orderStatus;

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public Long getId() {
        return id;
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public void setId(Long id) {
        this.id = id;
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public String getOrderId() {
        return orderId;
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public void setOrderId(String orderId) {
        this.orderId = orderId;
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public Date getCreateTime() {
        return createTime;
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public BigDecimal getAmount() {
        return amount;
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public void setAmount(BigDecimal amount) {
        this.amount = amount;
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public Byte getOrderStatus() {
        return orderStatus;
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public void setOrderStatus(Byte orderStatus) {
        this.orderStatus = orderStatus;
    }
}

// club.throwable.dao
public final class OrderDynamicSqlSupport {
    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public static final Order order = new Order();

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public static final SqlColumn<Long> id = order.id;

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public static final SqlColumn<String> orderId = order.orderId;

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public static final SqlColumn<Date> createTime = order.createTime;

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public static final SqlColumn<BigDecimal> amount = order.amount;

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public static final SqlColumn<Byte> orderStatus = order.orderStatus;

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    public static final class Order extends SqlTable {
        public final SqlColumn<Long> id = column("id", JDBCType.BIGINT);

        public final SqlColumn<String> orderId = column("order_id", JDBCType.VARCHAR);

        public final SqlColumn<Date> createTime = column("create_time", JDBCType.TIMESTAMP);

        public final SqlColumn<BigDecimal> amount = column("amount", JDBCType.DECIMAL);

        public final SqlColumn<Byte> orderStatus = column("order_status", JDBCType.TINYINT);

        public Order() {
            super("t_order");
        }
    }
}

@Mapper
public interface OrderMapper {
    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    BasicColumn[] selectList = BasicColumn.columnList(id, orderId, createTime, amount, orderStatus);

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    @SelectProvider(type=SqlProviderAdapter.class, method="select")
    long count(SelectStatementProvider selectStatement);

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    @DeleteProvider(type=SqlProviderAdapter.class, method="delete")
    int delete(DeleteStatementProvider deleteStatement);

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    @InsertProvider(type=SqlProviderAdapter.class, method="insert")
    @SelectKey(statement="SELECT LAST_INSERT_ID()", keyProperty="record.id", before=true, resultType=Long.class)
    int insert(InsertStatementProvider<Order> insertStatement);

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    @SelectProvider(type=SqlProviderAdapter.class, method="select")
    @Results(id="OrderResult", value = {
        @Result(column="id", property="id", jdbcType=JdbcType.BIGINT, id=true),
        @Result(column="order_id", property="orderId", jdbcType=JdbcType.VARCHAR),
        @Result(column="create_time", property="createTime", jdbcType=JdbcType.TIMESTAMP),
        @Result(column="amount", property="amount", jdbcType=JdbcType.DECIMAL),
        @Result(column="order_status", property="orderStatus", jdbcType=JdbcType.TINYINT)
    })
    Optional<Order> selectOne(SelectStatementProvider selectStatement);

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    @SelectProvider(type=SqlProviderAdapter.class, method="select")
    @Results(id="OrderResult", value = {
        @Result(column="id", property="id", jdbcType=JdbcType.BIGINT, id=true),
        @Result(column="order_id", property="orderId", jdbcType=JdbcType.VARCHAR),
        @Result(column="create_time", property="createTime", jdbcType=JdbcType.TIMESTAMP),
        @Result(column="amount", property="amount", jdbcType=JdbcType.DECIMAL),
        @Result(column="order_status", property="orderStatus", jdbcType=JdbcType.TINYINT)
    })
    List<Order> selectMany(SelectStatementProvider selectStatement);

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    @UpdateProvider(type=SqlProviderAdapter.class, method="update")
    int update(UpdateStatementProvider updateStatement);

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default long count(CountDSLCompleter completer) {
        return MyBatis3Utils.countFrom(this::count, order, completer);
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default int delete(DeleteDSLCompleter completer) {
        return MyBatis3Utils.deleteFrom(this::delete, order, completer);
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default int deleteByPrimaryKey(Long id_) {
        return delete(c -> 
            c.where(id, isEqualTo(id_))
        );
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default int insert(Order record) {
        return MyBatis3Utils.insert(this::insert, record, order, c ->
            c.map(id).toProperty("id")
            .map(orderId).toProperty("orderId")
            .map(createTime).toProperty("createTime")
            .map(amount).toProperty("amount")
            .map(orderStatus).toProperty("orderStatus")
        );
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default int insertSelective(Order record) {
        return MyBatis3Utils.insert(this::insert, record, order, c ->
            c.map(id).toProperty("id")
            .map(orderId).toPropertyWhenPresent("orderId", record::getOrderId)
            .map(createTime).toPropertyWhenPresent("createTime", record::getCreateTime)
            .map(amount).toPropertyWhenPresent("amount", record::getAmount)
            .map(orderStatus).toPropertyWhenPresent("orderStatus", record::getOrderStatus)
        );
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default Optional<Order> selectOne(SelectDSLCompleter completer) {
        return MyBatis3Utils.selectOne(this::selectOne, selectList, order, completer);
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default List<Order> select(SelectDSLCompleter completer) {
        return MyBatis3Utils.selectList(this::selectMany, selectList, order, completer);
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default List<Order> selectDistinct(SelectDSLCompleter completer) {
        return MyBatis3Utils.selectDistinct(this::selectMany, selectList, order, completer);
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default Optional<Order> selectByPrimaryKey(Long id_) {
        return selectOne(c ->
            c.where(id, isEqualTo(id_))
        );
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default int update(UpdateDSLCompleter completer) {
        return MyBatis3Utils.update(this::update, order, completer);
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    static UpdateDSL<UpdateModel> updateAllColumns(Order record, UpdateDSL<UpdateModel> dsl) {
        return dsl.set(id).equalTo(record::getId)
                .set(orderId).equalTo(record::getOrderId)
                .set(createTime).equalTo(record::getCreateTime)
                .set(amount).equalTo(record::getAmount)
                .set(orderStatus).equalTo(record::getOrderStatus);
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    static UpdateDSL<UpdateModel> updateSelectiveColumns(Order record, UpdateDSL<UpdateModel> dsl) {
        return dsl.set(id).equalToWhenPresent(record::getId)
                .set(orderId).equalToWhenPresent(record::getOrderId)
                .set(createTime).equalToWhenPresent(record::getCreateTime)
                .set(amount).equalToWhenPresent(record::getAmount)
                .set(orderStatus).equalToWhenPresent(record::getOrderStatus);
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default int updateByPrimaryKey(Order record) {
        return update(c ->
            c.set(orderId).equalTo(record::getOrderId)
            .set(createTime).equalTo(record::getCreateTime)
            .set(amount).equalTo(record::getAmount)
            .set(orderStatus).equalTo(record::getOrderStatus)
            .where(id, isEqualTo(record::getId))
        );
    }

    @Generated("org.mybatis.generator.api.MyBatisGenerator")
    default int updateByPrimaryKeySelective(Order record) {
        return update(c ->
            c.set(orderId).equalToWhenPresent(record::getOrderId)
            .set(createTime).equalToWhenPresent(record::getCreateTime)
            .set(amount).equalToWhenPresent(record::getAmount)
            .set(orderStatus).equalToWhenPresent(record::getOrderStatus)
            .where(id, isEqualTo(record::getId))
        );
    }
}

<context id="default" targetRuntime="MyBatis3Simple">
...

<javaClientGenerator type="XMLMAPPER"
...

// club.throwable.entity
public class Order {
    private Long id;

    private String orderId;

    private Date createTime;

    private BigDecimal amount;

    private Byte orderStatus;

    public Long getId() {
        return id;
    }

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

    public String getOrderId() {
        return orderId;
    }

    public void setOrderId(String orderId) {
        this.orderId = orderId;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public BigDecimal getAmount() {
        return amount;
    }

    public void setAmount(BigDecimal amount) {
        this.amount = amount;
    }

    public Byte getOrderStatus() {
        return orderStatus;
    }

    public void setOrderStatus(Byte orderStatus) {
        this.orderStatus = orderStatus;
    }
}

// club.throwable.dao
public interface OrderMapper {
    int deleteByPrimaryKey(Long id);

    int insert(Order record);

    Order selectByPrimaryKey(Long id);

    List<Order> selectAll();

    int updateByPrimaryKey(Order record);
}

// mappings
<?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="club.throwable.dao.OrderMapper">
    <resultMap id="BaseResultMap" type="club.throwable.entity.Order">
        <id column="id" jdbcType="BIGINT" property="id"/>
        <result column="order_id" jdbcType="VARCHAR" property="orderId"/>
        <result column="create_time" jdbcType="TIMESTAMP" property="createTime"/>
        <result column="amount" jdbcType="DECIMAL" property="amount"/>
        <result column="order_status" jdbcType="TINYINT" property="orderStatus"/>
    </resultMap>
    <delete id="deleteByPrimaryKey" parameterType="java.lang.Long">
        delete
        from t_order
        where id = #{id,jdbcType=BIGINT}
    </delete>
    <insert id="insert" parameterType="club.throwable.entity.Order">
        <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Long">
            SELECT LAST_INSERT_ID()
        </selectKey>
        insert into t_order (order_id, create_time, amount,
        order_status)
        values (#{orderId,jdbcType=VARCHAR}, #{createTime,jdbcType=TIMESTAMP}, #{amount,jdbcType=DECIMAL},
        #{orderStatus,jdbcType=TINYINT})
    </insert>
    <update id="updateByPrimaryKey" parameterType="club.throwable.entity.Order">
        update t_order
        set order_id     = #{orderId,jdbcType=VARCHAR},
            create_time  = #{createTime,jdbcType=TIMESTAMP},
            amount       = #{amount,jdbcType=DECIMAL},
            order_status = #{orderStatus,jdbcType=TINYINT}
        where id = #{id,jdbcType=BIGINT}
    </update>
    <select id="selectByPrimaryKey" parameterType="java.lang.Long" resultMap="BaseResultMap">
        select id, order_id, create_time, amount, order_status
        from t_order
        where id = #{id,jdbcType=BIGINT}
    </select>
    <select id="selectAll" resultMap="BaseResultMap">
        select id, order_id, create_time, amount, order_status
        from t_order
    </select>
    <resultMap id="BaseResultMap" type="club.throwable.entity.Order">
        <id column="id" jdbcType="BIGINT" property="id"/>
        <result column="order_id" jdbcType="VARCHAR" property="orderId"/>
        <result column="create_time" jdbcType="TIMESTAMP" property="createTime"/>
        <result column="amount" jdbcType="DECIMAL" property="amount"/>
        <result column="order_status" jdbcType="TINYINT" property="orderStatus"/>
    </resultMap>
    <delete id="deleteByPrimaryKey" parameterType="java.lang.Long">
        delete
        from t_order
        where id = #{id,jdbcType=BIGINT}
    </delete>
    <insert id="insert" parameterType="club.throwable.entity.Order">
        <selectKey keyProperty="id" order="BEFORE" resultType="java.lang.Long">
            SELECT LAST_INSERT_ID()
        </selectKey>
        insert into t_order (id, order_id, create_time,
        amount, order_status)
        values (#{id,jdbcType=BIGINT}, #{orderId,jdbcType=VARCHAR}, #{createTime,jdbcType=TIMESTAMP},
        #{amount,jdbcType=DECIMAL}, #{orderStatus,jdbcType=TINYINT})
    </insert>
    <update id="updateByPrimaryKey" parameterType="club.throwable.entity.Order">
        update t_order
        set order_id     = #{orderId,jdbcType=VARCHAR},
            create_time  = #{createTime,jdbcType=TIMESTAMP},
            amount       = #{amount,jdbcType=DECIMAL},
            order_status = #{orderStatus,jdbcType=TINYINT}
        where id = #{id,jdbcType=BIGINT}
    </update>
    <select id="selectByPrimaryKey" parameterType="java.lang.Long" resultMap="BaseResultMap">
        select id, order_id, create_time, amount, order_status
        from t_order
        where id = #{id,jdbcType=BIGINT}
    </select>
    <select id="selectAll" resultMap="BaseResultMap">
        select id, order_id, create_time, amount, order_status
        from t_order
    </select>
</mapper>

public class DefaultJavaTypeResolver extends JavaTypeResolverDefaultImpl {

    public DefaultJavaTypeResolver() {
        super();
        typeMap.put(Types.SMALLINT, new JdbcTypeInformation("SMALLINT",
                new FullyQualifiedJavaType(Integer.class.getName())));
        typeMap.put(Types.TINYINT, new JdbcTypeInformation("TINYINT",
                new FullyQualifiedJavaType(Integer.class.getName())));
    }
}

<javaTypeResolver type="club.throwable.mbg.DefaultJavaTypeResolver">
        <property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
...

public class Main {

    public static void main(String[] args) throws Exception {
        List<String> warnings = new ArrayList<>();
        // 如果已经存在生成过的文件是否进行覆盖
        boolean overwrite = true;
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(Main.class.getResourceAsStream("/generator-configuration.xml"));
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator generator = new MyBatisGenerator(config, callback, warnings);
        generator.generate(null);
    }
}