Mybatis配置文件——全配置解析

<settings>
    <setting name="cacheEnabled" value="true"/>
    <setting name="lazyLoadingEnabled" value="true"/>
    <setting name="multipleResultSetsEnabled" value="true"/>
    <setting name="useColumnLabel" value="true"/>
    <setting name="useGeneratedKeys" value="false"/>
    <setting name="autoMappingBehavior" value="PARTIAL"/>
    <setting name="autoMappingUnknownColumnBehavior" value="WARNING"/>
    <setting name="defaultExecutorType" value="SIMPLE"/>
    <setting name="defaultStatementTimeout" value="25"/>
    <setting name="defaultFetchSize" value="100"/>
    <setting name="safeRowBoundsEnabled" value="false"/>
    <setting name="mapUnderscoreToCamelCase" value="false"/>
    <setting name="localCacheScope" value="SESSION"/>
    <setting name="jdbcTypeForNull" value="OTHER"/>
    <setting name="lazyLoadTriggerMethods" value="equals,clone,hashCode,toString"/>
</settings>

<typeAliases>
	<typeAlias alias="blog" type="com.domain.Blog" />
</typeAliases>

<select id="selectBlogByBean" parameterType="blog" resultType="blog" 
	select bid, name, author_id authorld from blog where name = 'S{name}'
</select>

public class MyTypeHandler extends BaseTypeHandler<String> {
    public void setNonNullParameter(PreparedStatement ps, int i, String parameter, JdbcType jdbcType)
            throws SQLException {
        // 设置 String 类型的参数的时候调用，Java类型到JDBC类型
        // 注意只有在字段上添加typeHandler属性才会生效
        // insertBlog name字段
        System.out.println("---------------setNonNullParameter1："+parameter);
        ps.setString(i, parameter);
    }

    public String getNullableResult(ResultSet rs, String columnName) throws SQLException {
        // 根据列名获取 String 类型的参数的时候调用，JDBC类型到java类型
        // 注意只有在字段上添加typeHandler属性才会生效
        System.out.println("---------------getNullableResult1："+columnName);
        return rs.getString(columnName);
    }

    public String getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        // 根据下标获取 String 类型的参数的时候调用
        System.out.println("---------------getNullableResult2："+columnIndex);
        return rs.getString(columnIndex);
    }

    public String getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        System.out.println("---------------getNullableResult3：");
        return cs.getString(columnIndex);
    }
}

<typeHandlers>
	<typeHandler handler="com.type.MyTypeHandler"></typeHandler>
</typeHandlers>-->

    <insert id="insertBlog" parameterType="blog">
    insert into blog
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="bid != null">
                bid,
            </if>
            <if test="name != null">
                name,
            </if>
            <if test="authorId != null">
                author_id,
            </if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="bid != null">
                #{bid,jdbcType=INTEGER},
            </if>
            <if test="name != null">
                #{name,jdbcType=VARCHAR,typeHandler=com.gupaoedu.type.MyTypeHandler},
            </if>
            <if test="authorId != null">
                #{authorId,jdbcType=INTEGER},
            </if>
        </trim>
    </insert>

<result column="name" property="name" jdbcType="VARCHAR" typeHandler="com.type.MyTypeHandler"/>

public class ObjectFactoryTest {
    public static void main(String[] args) {
        GPObjectFactory factory = new GPObjectFactory();
        Blog myBlog = (Blog) factory.create(Blog.class);
        System.out.println(myBlog);
    }
}

public class ObjectFactory extends DefaultObjectFactory {
    @Override
    public Object create(Class type) {
        System.out.println("创建对象方法：" + type);
        if (type.equals(Blog.class)) {
            Blog blog = (Blog) super.create(type);
            blog.setName("object factory");
            blog.setBid(1111);
            blog.setAuthorId(2222);
            return blog;
        }
        Object result = super.create(type);
        return result;
    }
}

<objectFactory type="org.mybatis.example.ObjectFactory"
<!--对象工厂注入的参数-->
<property name="666" value="666"/>
</objectFactory>

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=utf-8&rewriteBatchedStatements=true
jdbc.username=root
jdbc.password=123456

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/><!-- 单独使用时配置成MANAGED没有事务 -->
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>