15Mybatis_输出类型

输出类型分为两种：1.resultType          和         2.resultMap

接下来先讲解resultType:

使用resultType进行输出映射，只有查询出来的列名和pojo中的属性名一致，该列才可以映射成功。

如果查询出来的列名和pojo中的属性名全部不一致，没有创建pojo对象。

只要查询出来的列名和pojo中的属性有一个一致，就会创建pojo对象。

案例：

userMapper.xml文件:

<?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">
<!-- nanmespace:命名空间。 作用就是对sql进行分类话管理，理解Sal分离

注意：使用mapper代理方式，namespace有特殊重要的作用
-->

<mapper namespace="cn.itcast.mybatis.mapper.userMapper">

 <!--
 这里的id要和Mapp接口里面的函数名字一模一样。parameterType表示输入的类型，
 resultType表示输出的类型

  -->
    <select id="findUserList" parameterType="cn.itcast.mybatis.po.UserQueryVo" resultType="cn.itcast.mybatis.po.UserCustom">
        SELECT * FROM USER WHERE user.sex= #{userCustom.sex} AND user.username=#{userCustom.username}
    </select>

</mapper>

这里的resultType是"cn.itcast.mybatis.po.UserCustom"。

就是说 SELECT * FROM .......这里的* 如果改为username_而不是UserCustom中的username的话这个username就会映射失败，它的值就是null。

2.resultMap

Mybatis中使用resultMap完成高级输出结果的映射。其实就是对上面的弊端（只有sql语句中select id ...这些要和user中的属性名一致才能映射正确）的一个改正，用resultMap就可以如果查询出来的列名和pojo的属性名不一致，通过定义一个resultMap对列名和pojo属性名之间作一个映射关系。

思路:

1.定义resultMap

2.使用resultMap作为statment的输出映射类型。

我们要将SELECT id id_,username username_ FROM USER这句话成功映射。我们知道上面的那种resultType是不能成功的。

案例如下；

案例结构如下：

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dK/is51rs2TKgGMocrbj9n7u/vJ4aHGcwUp6g2f9o9Pkq+k03eeW+cnfifezsny74r8Xx9APHFEPr7+0FmCaLT6fr6+ojhYa9NFKekxf+pazzc2zFZ9p1mXF2Io/mOfWFprBsTGqjfd8At93ZMlk3ecW98nfT19YHMEoSW+aF6Gic87OauT3/e+Bm/vH3bObZStFwmk8mWF42xeWDL3dTJxKEKrQ9Iof+CsuVF4+4KZJYmr1696unpab1bgoeH1e+d1nq/8i0gRUwmU09Pz6tXr4L90vMOkNk9VqvVaDD09PSIffMCkBA9PT1GgwHCCaSJ1Wp91drq/7waICR41doadiYjkBkAJAPIDAASAWQGAIkAMgOARACZHaT/sMIv/WI/dBpKjPWH5EJ0dwCEIlnm29mrb2WtvkX/m7V67cxJ+GLd/jjfbCZEX/0gswSJXJmr01c/rUx+qU1/fialLjdO9e3Mp5Xbm7Xpz8+k1B6Ou5Ee4+sN+uRXVX3106xe9QO/BxseSFPmmpoalUolXufKzyvb63PNzRpjw9HHpxMLN37dfv+IuVljfHi0QbPlWup3vh4UyAz4FwnKXF1dPXHixAkTJohXu5S0XFejNjzIa7n5S33RTzn/+NyxeCvn3omNl7d/K9yU/sFjmUxGzzi1CplcrVZgazAcIriaOGtwOqFrOmDMYa/jd8KMR67WOqoqtK6+5Wo9d2asVcjkar1jWK4OXa5yh8HeKOY1abyejEeosdCQhIfK/xvilSPvbEBqMtMmL1myxK3M57YsvVeY0FCWfK9oa/X+73d8Pb2uMKGhLPl+8dbre9dc3LpEoJ1WwX2daBXMS4x/Sul69ePHN34nerXCuaxVOLojHBGJB0nstYv/sDpT1yGwoyrTtYw1HGcb/jAQx2ChsXk8HuGtkIdEXo/tFXtYEfvD8pKSmTF56dKl4jJvWjw37i+T0r+Znv/j4n0r56Ys+ixx4fSURZ/9vHjavph5x9ctjp3+Mfn6Nv4SIqzSq+UeyEzoxFmDdfihVcCrCsksx+TgP8Yf8N9ZuIu8YZBkJozN8/G42wprUWA9NmPgTEMiVGUpyYyb7FZm89s3+f9c0FC5s+nq3kdnM67nrE1eNO1BxY6n2l1PzmXcyInL/+cX1u4uQks/yaxXy1nzbfwFSb/s6SfHJrNjWEQpWYvkYQi3Y43N4/G43QprUVhmwjsJyCwJVCrVBIyMjAzx+kVxC9vrj9AXwBpKElIWTWMugNXlbype+1eBdq55HkJaNXPOzJGZmW8LT7NZnWB96NVyZpqtZp03Ip5XnAOv8GO9Wi5XKOT4ONlnpbwJOVaDPM3mjs3z8QhvhTAkwfX43xBpFcR3hMhCOjJ7y4nvv2AugNWd2LQvZh5zAexW7voCxeeCLV0TROLJm5DMznauQyx3kumYLioU+CGccDnIdS3KY5m5p+l6tVymUPAvKpGHwd6owNi8GA9xK2JDIq0XuYom9v8uYSJX5qOr5t8rTHh4OuV+ceK1PWvyf/wbs1iVGXN8zbxgD9DHCJynhw5CHka0n14RuTIfWT7r0PLZTNnxd9bisVVzgj1AnxIGRoDM4yVyZab6bAPmDqZsXDgLX7QP9gV7gD4D/3gohAGZx0vkysyBfO0aAMIHkBkAJALIDAASAWQGAIkAMgOARACZfcOZkmcrvihaNq/wu/8qvH2tJdjDASIRkNlrzmf/J6ek/mPdN7PyTV39dFky+wT4DAQekNlrzmR9bB95j5dv5pz8+6wTqxZqrKZB5bflMQuKVi0oDvYwAw4kCgUbkNlrTmf+cdj+Hi9L5hR8M/vEmi9LLKaBtd+eXvNlybJ5Bf4cAvFeJcS6kTjwgMzBBmRGyN3vM3MoSZ80MPyeKQu2l/x91omvZx7/ds4Jc1f/8vknl8zO/9b/MsvlnJst2TdyAJEHyIwQQhqNprS01GKxeFK5cOfkvqFRpkQpc/+68PjfZ540dfW/f/+v3190fzP7ROHhB/4cr14tlynU/FuL5Wp1qN9OAfgPkBkhhDQajclkysvL6+jocFs5P3VKz8AoU6KUuVHK3J83XVn3XblyeUXc0pK8vXWEZvhXjN0kabmNtnIFi3HDvbhZOsQ7BP2Ts8XdQbwr1hTctSAcIwaMAZAZIYQ0Gg1CyGKxqNVqnbuf2D6aEmXtH2EKLTP9uMs2fDQlityMKDPhJgJPoq3w6Bz2Tfl4uEiAc7bEI75YqSfOfggjBMYOyIyQU2aEUGdnZ2pqqs1mE6l8OHmquXeELm3dA1HK3BnxJ5g1h5OnkpuRj8y8JC2Poq1YXsnxoBL2XcsBzdlir+ZtGs8MEqkGjB2QGSGnzFar1ZMj84Gk6O6eEbrU60xRytyFKSXMmgNJ0eRmAtNsZhnP7XUXbcWNE3OdKbPDPAKas8U+cvPzzOjO9ExImkA1YMyAzAghpNFozGazh+fM6sRPOm32qgevd5++Nz+xKEqZm1FS22mz00Wd+Am5GXbaKJry5Um0FTdOjDVD5h2i/ZuzxQ9IIm+al0MmVA0YKyAzQl5ezd6dIO+w2q89MkQpc+ckFCbm/9bSOdBhtdNld4JcqCEzpRRP+fIg2oq1yFpgn5ryNueHnC1C2hk5SIznrFA1YIyAzAh5+TmzavOnBjMlVFSbP/XrUMeHP9M8YKocbEBmr0mL/9NrEyVU0uL/FOwBiuBHmeELYEEHZPaanzd+Jl6CPUAR/COz41QBDstBBmQGAIkAMgOARACZAUAigMwAIBFAZgCQCCAzAEgEkBkAJALI7CD9hxV+6TdEv0sx1g+WQ3R3AIQiWebb2atvZa2+Rf+btXrtzEn4Yt3+ON9sJkRf/SCzBIlcmavTVz+tTH6pTX9+JqUuN0717cynldubtenPz6TUHo67kR7j6w365LvLvvoCtFf9wLeuwwNpylxTU6NSqcTrXPl5ZXt9rrlZY2w4+vh0YuHGr9vvHzE3a4wPjzZotlxL/c7XgwKZAf8iQZmrq6snTpw4YcIE8WqXkpbratSGB3ktN3+pL/op5x+fOxZv5dw7sfHy9m+Fm3JisZz5AKygLCeuuC5WG0K2Fil0g72O3wkzHrla66iKJ4QwtyZyo8JEQr+4w2Bv1E16Gb7PbhLF4LvcPkdqMtMmL1myxK3M57YsvVeY0FCWfK9oa/X+73d8Pb2uMKGhLPl+8dbre9dc3LpEoJ1WwTVWq5DhN/mznySnfPA7IQViEY6IxIMklq2HRxWQ0gK0ClKOFx4GJpAchhksNDbWIAUSxdhvK+CzT5GUzIzJS5cuFZd50+K5cX+ZlP7N9PwfF+9bOTdl0WeJC6enLPrs58XT9sXMO75ucez0j8nXtwlJOpzUOw9kJsfxEHOzZMIRmMQBEB/jD9xGl4gmh4mkl5H2mbXI3WuYvfsY6ciMm+xWZvPbN/n/XNBQubPp6t5HZzOu56xNXjTtQcWOp9pdT85l3MiJy//nF9buLkJLP8ksFoiFJYSNUWbHsIhSshbdJoeJjY2wz6xFgsxwYdyXSEdmlUo1ASMjI0O8flHcwvb6I/QFsIaShJRF05gLYHX5m4rX/lWgHT471Kq5GXzOF6hAmA5/6unohBiIRUgI43jFj+QUeMzJ3xIK/RJODuNPs7ljc41HLFGMd/YO+AzpyOwtJ77/grkAVndi076YecwFsFu56wsUnwu2dE1DmdeoJzI723Hz38Vys8hx9a5rUR7LzDVJLAyMPwz2RgXGxpaZnCgGF8D8SeTKfHTV/HuFCQ9Pp9wvTry2Z03+j39jFqsyY46vmRfsAfqYAB4I4WQ4OESuzEeWzzq0fDZTdvydtXhs1ZxgD9CnBNQvkDk4RK7MVJ9twNzBlI0LZ+GL9sG+YA/QZ7CTtQMAyBwcIldmDuRr1wAQPoDMACARQGYAkAggMwBIBJAZACQCyAwAEgFk9prz2f/JL1U50/rM8N1EIJiAzF5zJutj+8h7Tmkoi7mw91OL8XEQBgRRPgBCCGQeA6cz/zhsf88pLTXJD07FnNnzqVnQZ973KX111xDIDCCEQGYar36fuSR90sDwe6Ys2F4Sk33m1R2V/kZy/amYsiyhH1v3m8wAgBACmWk0Gk1paanFYvGkcuHOyX1Do0yJUuZGKXOZxcKdkwXagcyAfwGZEUJIo9GYTKa8vLyOjg63lfNTp/QMjDKFlplZzE+dItBOTGZSnhYvJAzP1hJKH+F2xJqCc+44hhsRJQbIjBBCGo0GIWSxWNRqtU6nE698NCXK2j/CFFpmZvFoSpRAO2GZCTcmcO6RJgV34f2IJHix4kac/RCCvoCwB2RGyCkzQqizszM1NdVms4lUPpw81dw7Qpe27oEoZe6M+BPMmsPJUwXaiRyZeXla+D38roOzwN1I7NWkIDFCazg2Sw+QGSGnzFar1ZMj84Gk6O6eEbrU60xRytyFKSXMmgNJ0QLteCqSAu7w9F7e6bQ7mQWCxOjOXG8dYnljQBgDMiOEkEajMZvNHp4zqxM/6bTZqx683n363vzEoihlbkZJbafNThd14idCDVnRWHiMDyHrizX91SpIkZr8ZCJyghcvAEyoGhDmgMwIeXk1e3eCvMNqv/bIEKXMnZNQmJj/W0vnQIfVTpfdCUIfTSHEnj7jh15CYDxhHuxOZoEEL56zQtWA8AZkRsjLz5lVmz81mCmhotr8qV+HSgCmygBCCGQeA2nxf3ptooRKWvyfAjwe+AIYQAMye83PGz8TL4EbimN2DodlACGQGQAkA8gMABIBZAYAiQAyA4BEAJkBQCKAzAAgEUBmr4EMMCA0AZm9JuQywEIB+OZKCAAye02IZYBhX/cO4pdHQOYQAGRGKHwzwLQKlsJahTf9wVe6pQbIjFC4ZoCNMyUEZJYaIDNCYZoBRg4w4EeCOR6zN4FNzllpJ/wxyNVaR0uF1lWLu2XIIQsBQGaEwjQDzCuZCZvAV2FJCQg/5GPhgfhPtvN7gxyyEABkRihMM8C8OzLzNsEPFiJ0gT8h9Ji3UcghCxIgM0LhmgEmYLPANJu7CTcyM4djL2WGHLLgATIjFKYZYGwj6HpytR4/RXVtkbAJ0Wm2a8ogKjPkkIUSIDNCYZoBxu+RdwUKj/jib8JRze0FMK9khhyy4AEyIxTuGWChAEyVQwCQ2WtCLQMsFIAvgIUCILPXhFAGWCgAOWQhA8gMABIBZAYAiQAyA4BEAJkBQCKAzAAgEUBmAJAIILPXQAYYEJqAzF4DGWCeAl8lCSwgs9eEVgYY9hVufmSAT+DfbuyppCBzYAGZEQrvDDCsCz/df8S1Gb6HHaKAzAhJKQPML6kd7E7B5VAFZEZIUhlgpEwPln7i3SoUcsKNzbjNvLgT/o2T2A5CMFgAAZkRklQGmLOyYHiQF91qFXgaID8gQSg5jDsWCAYLDCAzQpLKAHN2SpTZk25d/bpcJr9HCCaHkVdAMJi/AZkRCuMMMOFzZiGZ3XfreD/grKUXuRN2cnIYr2MIBgsIIDNCYZsBJnY1m5gE5mG3nLwuV+dyOWulQHIYBIMFCZAZobDOABP+nJmYBOZht5x3CVdL7kqhCDIIBgsCIDNCksgA8+2hTCiT2ztgqhxYQGavCd0MMOYwOU6DfCQhfAEswIDMXiPtDDD8V2jG2wsclgMLyAwAEgFkBgCJADIDgEQAmQFAIoDMACARQGYAkAggMwBIBGnKfCwtyf8bcXz3UKGG70YAIUF4yzxkNT46rnxwZM2DI2ueFsXHL5oVO3Nq7MypsbOm0g+Sly3006bZ3zsGmYHgE94y39y1sNfwcKCraaCrydx47aeF01pu5+hv/hI7c2rLrZyWm7/EzhS6u3i8+ObbywDgO0Ja5pqaGpVKJfTskKXtdvrUt3e3vXuW0f8srachZfOX03Q31M3X98bOnPr7jX2/V+8DmYHIIXRlrq6unjhx4oQJE4Qq3N0zp+tJXk9rWV9beV9beeI3sx1zbHbZtzFWoAN+GhYx0UqrkMnVagVeE6vHv2HfWVENugMBJSj2xGMAABkrSURBVERlpk1esmSJiMzXUiZR3Vq8bFn8l5ZbOfrf9tPTbL3YNJt/x65QopVWwaiNnR4TEqx4uXcgMxBIQlFmxuSlS5eKyHx528fUm9N0GXxd3Hr1J23GzLuHF9w9vOBS+vTaQwtqDy24mDb9wcmVDQWruY35s2TBRCtOCJ6wzJweYCIOBJaQkxk3WVzm81v+QL0+Qb0+YXu67+6hLzob9lKd56jO81TnBarrItV1keq6RHVrbc0F1VnTuY09kpmZU4PMQBgQcjKrVKoJGBkZGUI1Kzf9B9Vy0NqQXrNnhvXJPqq9gGovpNqLKEMxZSimDBrKWGJ9dvBq9mxL2yNea3xKrFU7w6EJiVaeywzTbCCohJzMnnNqw0eWuqRrqj9b6ndQ+hxKf4DSH6RaDlItv1Ith6jWw5YGlTZ9hvnVQ3J7V+AUISCeewHMI5lZIVZwAQwIMGEsc7Hy3y+lTDXX/kQ1plGN6VRjOtWUQTVlUk0q6mWWqXbbhZ0zTK0CJgcAmGYDgSWMZX5YmVWonFgW//HpzZPLE6IqtkZXbo2u3BpdsfWTCztn1xUmDL7rDOyI9Go5KUkXAAJCGMscimBBtmAyEGBAZgCQCCAzAEgEkBkAJALIDAASAWQGAIkAMgOARACZAUAigMwIIRQTExPsIQDAeIlQmWPZLFu2DF9MSgpAHiAA+JgIlTkxMdFoppiSlJSELyYmJgZ7gADgNdKUWTw8DCGUkJBgNFP0Y6OZSkrahi8mJCT4fYgA4GskKLPb8DCE0OYtm3F7t21jybx5y2bhplqFTK7WOr6DrdC67pt0fRkb+4Y2fm+kQuu6xdLdekSKKMMqwze/AR5Sk9mT8DCEUHx8PD6vXr9+/dq1a9etW1dx7orRTMXHxws3xVzCf5gcz9FWOE1zpRXQfjNpCG7Xc26ipteyKwMAG0nJ7GF42Pz585cs+Uah+J4uP/zwg1KpbHimr7p+Oy4uTqlUKpXKtWvXVlRUkFrjmgk95h+bWRGeHD8J6/GUBNfBmVMZAFhIR2bPw8MQQhs2bGAOy7Gxscaud/bRD4PUhzaj+aXe0KQ3VNfciYuLIzV1JzOeF8T+2QvvZCZMpEFmQAzpyOx5eBhC6Mf1PzInybGxsbb+UU4FU89IbCwxcNudzNg6vVrOmk6zwoXE1+NxYkirIL4jAAAL6cjsFUqlEpf58fPfk5OTkzAStyVt2LCB9IGz22k2lgOmULCOzAr+dS6h9SJX0fzx9wCkQITKHBsXi0+z4+PjGxsbLRgmkykvL8933x4R8hD8BHxGhMq8+G+LmaJQKGJJJCQk9Pf3+2iDIDPgdyJUZg7r1in9vAWQGfA7IDMASASQGQAkAsgMABIBZAYAiQAyA4BEAJm9o/Fu4eMbv/JL56v6YA8NiHRAZu+orz78tr2xt9eGl3dPKl5d2qF/dDbYowMiGpDZO+5dO2LqbBseGWWV5iu2c/FGbXL7i2vBHmB4oVXAp+y+A2T2jtqqY52dr4fso6zServ/emrPhc3tF5Obn9b4fxT097b591WFXW4ByOxLQGbvuH75+Js37f3UKKt06ujy5uXd+7fK/T8KvVouk8vlHG0dt2aAzJEKyOwdVy8UvO4w9A6P9AyPfrX7I7z0DI+2vTHcqan0/yj0arlMoeZ8E1SvlsvV6vD6hXeQ2ZeAzN5x/nxRi8FIm4yvp2VuMbT/Vi1wGQz/Fjb2mHCno/v0L0d7VoQBvcCNGwpcFBl+Z7bzbmy3eWkgsy8Bmb2j7Kym+bWBNrlneJQuyCmz7rXh6vUL5JZEmQn3WXiS/oWnC7FzC1ytgxBF5qjtauQ2Lw1k9iUgs3cUV5Q9b3XI/LaXogtC6KvdH73tpRpbDRevXiK3JB+Z6dc4doDzKP2L5RXLH3beUMCjyDi74zbIAWT2JSCzdxwvq6hvMdIyv35H0QUh9NXuj16/oxpajecuV5FbCkyzmWUZL3VIoDF7UauQ4WfK7LyTgEeRgczBBGT2jiOlZx7ojG02in/O3GajHuiM5dqr5JbOgyjCTy/1ajXXb0/Sv/BFfP6KiIdo/0aRYftFb5O3gjMyBDL7CZDZOw5ozt1pNuoslM4yzFzHRgh9tfsjnWX4brOh+OJ1obbMpBfLBsNmsqwzYvH0L9YiawE/Zw5MFBk20+e9WYHMAQVk9o59xRdvNRlfmocazUPNlqHfzUPNlqEmy3CjeeiFZfjmS2PROUGZQwAIPJEyILN3qIouna5tuvGi48aLjupGV6HXVNQ25p+tCfYYRQCZpQzI7B2HKmqyTl7OPHlZVXA5vYD+tyq9oEpVcDnr5OWsk9pTVXXBHqMIILOUAZkBQCKAzAAgEUBmAJAIIDMASASQGQAkAsgMABIBZAYAiQAyI4RQTEyMH3qF7yoCASVCZeb84OOyZcvwRR/9kivIDAQUSclcW1s7MDDgSc3ExETm95mNZiopKQlfTExM9MVwQGYgoEhKZo1GU1paarFY3NZMSEgwmin6sdFMJSVtwxcTEhJ8MRyQGQgoUpPZZDLl5eV1dHSI19y8ZTNu77ZtLJk3b9ks0lY8tQu7OZ+R2W0Ulld5XQBARmoyI4QsFotardbpdCI14+Pj8Xn1+vXr165du27duopzV4xmKj4+XrAlObWLrTVBZvEoLK/yugCAjARlRgh1dnampqbabDZitfnz5y9Z8o1C8T1dfvjhB6VS2fBMX3X9dlxcnFKpVCqVa9euraioILUmpXbh2TqsODt+LJ7QY8/zugCAjARltlqtbo/MGzZsYA7LsbGxxq539tEPg9SHNqP5pd7QpDdU19yJi4sT7kA4tWsMMnuX1wUAZKQms9ls9uSc+cf1PzInybGxsbb+UU4FU89IbGwsoaWb1C7cS49l9i6vCwDISE1mD69mK5VKXObHz39PTk5OwkjclrRhwwbiB86ES1J4ULx6DNNsr/K6AICMpGT2/HPm2LhYfJodHx/f2NhowaCvio/l2yPkeNoxAPNqwDskJbPnLP7bYqYoFIpYEgkJCf39/V53DTIDQSJCZeawbp3SZ32BzECQAJkBQCKAzAAgEUBmAJAIIDMASASQGQAkAsgMABIhcmWu0ar45c61vQN9pmAPDQDGQuTKfP1itn3kPac8qdpec3nvO6vR017YP6EaBh8LY7+eDEiMyJX58vk9w/b3nNJSk/z4cvK1S2qb1c2tGg5AZiBkiFyZL5xRDwy/319cl55bk7BXu3ZHxcDw+1d3VPobyQ+127XnfvGol/CQOZTHBviMyJX5THlO39CoUDlTnuNRLyAzEDJErsxlZb/2DIzuL67bdeJ2+pEbyTlXt+y59N+Z5+JSy3sGRsvKfhVuSkz8chvZJVQBW++6d1LG60akf/wOTD2vTzmTYCKTq/Usr/kNiQlnQHgQuTJrSo5Y+0eEiqbkiEA7ocQvt5FdQhXY6/EuRaq51uM3djCmcvrEDHY9JDWEQ3g4E7kyFxQfNfeOEI/M5t6RguKj5GaCIUFuU36EKrDXc2+6EqjGLLJnCc5jrPBgWPko/Ia8hDMgfIhcmY8V5Hf3jAiVYwX55GZBkNmVRkKWmaCeZzILOoslnAHhQ+TKfCS/oNNmJx6ZO232I/kFAu2EEr8EIrtcHwUJZXpxxONNs8X750773YUBsqbZvIaEhDMgbIhcmQ8eK+6w2oXKwWPFgi3JiV8CkV1smUmZXnxthC+AESPBBAP0EbcK5wKYeJw/qBxuRK7M6txSg5naX1yXdexmysFrm3dfWrez0mCm6KLOLfX1Bsd5rINDJeCGyJV59+Gy1yZKqOw+XObrDYLMgH+JXJkzD1aIF19vEGQG/EvkygwAEgNkBgCJADIDgEQAmQFAIoDMACARQGYAkAiRKzNkgAESI3JlHmsGGPNDrb4gZEN8QnZggDCRK/NYM8DGLTP37oyQdCZkBwYIE7kyjzUDbJwy69VyuTxERYEvmYU3kSvzWDPAxiUzfXeyz3711ceAzOFN5Mo81gwwXGbivYr4evweSVfQgGgKIESFAWMkcmUeRwaY6+Z+UliXWHoBN31LQGaICgPGQOTKPMYMMEZmobAugVwh/PXvwZGZvwhRYYAbIlfmMWaAicnMmUM7q8vVenxaik+NfSkzRIVFOpEr8zgywASm2dipLGmazeqCe2SGqDBg3ESuzGPNAPPgApjrMMy+AIZ1IS4zRIUBYyByZQ5QBpj4x1Dup9neAofKyCVyZfZbBpheLRe45kyqynsaZAbGSOTK7McMMGxeKmiyY57K9w5kBsZI5MoMABIDZAYAiQAyA4BEAJkBQCKAzAAgESJU5sa7hY9v/Movna/qgz00ABgjESpzffXht+2Nvb02vLx7UvHq0g79o7PBHh0AjIUIlfnetSOmzrbhkVFWab5iOxdv1Ca3v7jmo+34NDDMLzg+E1eo/ZoTFPp/BykQoTLXVh3r7Hw9ZB9lldbb/ddTey5sbr+Y3Py0Rri1519MZl7EQjcY4WEDYwD7evaYZHF9xcS/oV8gcyCIUJmvXz7+5k17PzXKKp06urx5eff+rXKBppybosRfoyyZ5XI5RxfXjQ1j2AetgqWwVjGGbgIVYAQyB4IIlfnqhYLXHYbe4ZGe4dGvdn+El57h0bY3hjs1leSWzI3DHsGSWaHm36REvq3Ks5594AfILCUiVObz54taDEbaZHw9LXOLof23aqHLYEIWsSM5XPc2s+4cZslDL3BjeYh3KfIm9mIWEm+N1Cro+zGx0bHm6OTQL8J7DX7DtPNvoVXI5GqtY/B4sImzKcgcCCJU5rKzmubXBtrknuFRuiCnzLrXhqvXLwg2JtwjwbmDX1BmTlgXOwNEr1Y4tXGb6SUos1gyGf/0mBRg5HG4AjuPgfUOwc0+AJkDQYTKXFxR9rzVIfPbXoouCKGvdn/0tpdqbDVcvHpJvAfnVWBe6B1rkSczYxJTh92Wd2z2KgZIJBuMMwEQlllwXzibwc/18UrExyBzIIhQmY+XVdS3GGmZX7+j6IIQ+mr3R6/fUQ2txnOXqzzohjXN9Exm14SX6xM5yVMo2UfAZsFsMJBZ+kSozEdKzzzQGdtsFP+cuc1GPdAZy7VXyS1ZF7DxFytxakqSmTUTZfeB51nj02xCphdvBuy4mi2STOaZzEL7wpucE2frIHMQiVCZD2jO3Wk26iyUzjLMXMdGCH21+yOdZfhus6H44nWhtnjQJstrwkUjoszsBU4WH92FQsE6MhMzvVgbJQ+FewHMI5kFMsyw8wNeeCDIHBJEqMz7ii/eajK+NA81moeaLUO/m4eaLUNNluFG89ALy/DNl8aic4Iyu8eXH/gEOzkkUB9eAeMnQmVWFV06Xdt040XHjRcd1Y2uQq+pqG3MP1sz9t7DW2YvMsyAkCJCZT5UUZN18nLmycuqgsvpBfS/VekFVaqCy1knL2ed1J6qqht77+Ets2cZZkDoEaEyA4D0AJkBQCKAzAAgEUBmAJAIIDMASASQGQAkAsgMABJBmjJT3S+o7hfBHkVQ4fxGLHyXMgKQmswfRoZM17a8Pvpp16VY97VJ34tmf1WCvZ4sRSj8VjHP2GDI3Fo29+D2uQfL7jqWG7MPHii1+aDju1e2zz24fe7B7XOvNNJrjA0HHGsObp97cHt2q1DTxmyslQvbzVis+dyD2+eW3jQ6xu+bMQeBUJS5trZ2YGDAbbUXph5O+d3a968P7w0FcyxVH70+/tn7QYubLsj3GeD3Dbk1watIMBzfOibSW0BlZmnjG5nvXmE5THtrbDhAUJSNseHA3IMHsq+4rWkqLWXeDnz2BhQEQlFmjUZTWlpqsbhRMfte88rLTUz5R1XTrnu/I4Sstbs7yye/OfWJ7cFJN1sSkBm7ycedCd5FgnFagsweYCotJXTiicye1rTdjPXDbCIIhKjMJpMpLy+vo6NDpNr/+Dz5f32TxZT/+bXqo2W7EEKUWfcq78+mSxP1eV+42ZLwHYD4ncUeH5n5zV2bYEeIYHcp4sk73Nws8WAt7kZ502z87kv+uQC2HktHEK6jUJD2C0dMZlNpKWuqbGw4MLf0ppF+0nYz1lGTWw2xj8wMPpT57pXtsQ0m0pjDjRCVGSFksVjUarVOpxOqZuh6Nyc/FS/zTqb+tTz1r+Wp+twvTBcmvvzlswHDY7Etkc+Z8Rcp+5xZ7JQZew57oTuO8YT3BE5cASvUzxn5IR6sJdQbZ4VAihhnvYcJZKIJfcIyGxvKnIY0ZjtOcfFnDzgN51dzPOacGLPPmZnjKgF3MnPsBZl9Cy0zQqizszM1NdVmE/zbLir/OaEqiVP+Uryl+/bRV8ej2ov+0F65TWxL7oI2PJ+jsiLBCDflc3J22D3jaQKutxO3d/xzty96ZOY/IfAGw3rf4tRxEzYgPs3GrjnRWjoPifgpK6Eae73DW6KizHUy7EjrRmbesyCzb6Fltlqt4kdmhND/+XXN1KPrOOV/H1g90tv9eGe0per/NiRHv7cPCjXHXqrcWB/2PNPDgbOOaI5gHZ5hMv5FZsGcrQDK7FECmdB+OeDI7DoXNZWWbndOqjF1W8vmlt402m7GYk8RqmEwU24fTbP5WwGZfYtGozGbzW7PmX/b9k3p1kXE8lvSkhe/fN1xauLzPdHd988LdCB4bow94cEFMEIkGP2qVyjkrkU1991B6O0DaRX8yM/xykxKEeNd8xNIION2i+8XG7bM2FkxZojtZqzrkGsqLT2QfeWA80BKrGYqLXXNopnz27HKbCotxY7b9LsJqzrI7Fs8vJpdpZz1JPO/+OXhzvlVyllddZUvdk81aP79Ydbf+G1557mEwxdzskv8AJpdlXBOzQnpIF+AErv45LXMrGFyjq6EFDHSLtOtOQlk7PcykfARRmbuB87YKW5pWTZ2MDQ2HHBfDf9MWOBzZnxejfi9udriMrPFdgAy+xYPP2e+oJj2OH0+vzxInXdBMW2k/92t9ZOsV//tt3WTBt6+CsCwOUg1PEtkv7jnzOEIyBwUji2YULT0j4TyzcfHFkxACD1Wf393yx+vxPy/VxePB3pwUv0Opeh+8Q7IYQZ8Ayxo9HYaRApCqKf1ufHmGeqdOcADY+diSwep7pdkCGOZAQDAAZkBQCKAzAAgEUBmAJAIIDMASASQGQAkAsgMABJBmjL7IQOMfVtUcPHwy2X+SA5i36wNhBRSk9njDDCh0C/h2iHhMUJISOaAxICBzCFMKMockAwwodAvMqH1RWsPZfboKUA6hKLMAckAEwr9IgMyA6FPiMrs/wwwodAvxI/jwoJA8NgQfHrOy9MSyvRS83O8iDX50392HImn02zfxoBxcgkI4yR0AASKEJUZ+T0DTCj0ixjHxUm/4lfg5GkJZ3q55HK9UbDFFGzLcsh7mX0TA0b8kzBrYQYQVEJXZuTfDDCB0C9yHBf2yiVX4E3aCXU4r37eOpG2nGpeXADzdQwY+62JtI/kaQMQAEJXZj9ngAmk9gicHLNkdiuS+0wvUZn5bQMjsycxYLjMgs7iUWdA4AhRmf2fASYU+kWM4+JMs/kV+CmW4pleTplZNbVq58GN1JYdNzSGabZPYsAEJzSONwde1BkQOEJUZn9ngAmHfpGv4bCOQ4JXiTjdc+oQZcZrcsLB2BeR8ItNasEjM2vW648YMO51Q8Ifijd0IECEoszSyAADgAATijJ7SEhngAFAwAljmUM2AwwAgkIYywwAAA7IDAASAWQGAIkAMgOARACZAUAigMwAIBFAZgCQCBErszOOwB/ZOgAQDMJb5iGrsf7gijvZC+5kL6g/uGLIanTfxgHIDEiNUJTZw+9mI4RuZi8ctug/DJs/DJt7DQ/rDqzweCP8oCCQGQhvQlFmD++aGrK03U6f+rZ227tnGf3P0noaUt5e/+lp3tcPcr54kPPFk/yV9gGRHkBmQGqEqMyeZIDd3TOn60leT2tZX1t5X1t536vTPfqyd/pTvW1ne9vOWpoK6w8uFm6NT7PFg7IAIDwIUZmRBxlg15InUd1akXIteZLwRsgyk4KyACA8CF2ZkbsMsMvbPqY6TtNlsK1Yf/m/649+eXv/jNv7Z9xWz7itnnFD9cmdX+bf+WX+nV8+57UWOjIzFWDWDYQZoSuz2wyw81v+QL0+Qb0+YXu6r/bX+d2P9lOd56jO81TnearrAtV1keq6RHVrbc0F1VnTea1BZkBqhKjMnmSAVW76D6rloLUhvWbPDOuTfVR7AdVeQLUXUoYiylBMGTSUscT67MDV7NmWtke81gLTbEJQFgCEByEqsydXs09t+MhSt+2a6s+W+h2UPofS51D6A1TLQarlV6rlENV62NKQqU2fYX71kNRa4MhMCMoCgPAgFGX28HPmYuW/X0qZaq79iWrcSTWmUY3pVFMG1ZRJNamol1mm2sSLabNMrUSTAUCChKLMHvLwzJ5C5cSy+I9Pb55cnhBVsTW6cmt05dboiq3Rl9Lm3tdsG3zXGewxAkDgCGOZAQDAAZkBQCKAzAAgEUBmAJAIIDMASASQGQAkAsgMABIBZAYAiQAyA4BEAJkBQCKAzAAgEUBmAJAIIDMASASQGQAkAsgMABIBZAYAiQAyA4BEAJkBQCKAzAAgEUBmAJAI/x8z35HzF1OAdAAAAABJRU5ErkJggg==" alt="" />

我们主要修改的还是userMapper.xml和userMapper.java

第一步：我们先修改userMapper.xml代码：

<?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">
<!-- nanmespace:命名空间。 作用就是对sql进行分类话管理，理解Sal分离

注意：使用mapper代理方式，namespace有特殊重要的作用
-->

<mapper namespace="cn.itcast.mybatis.mapper.userMapper">

    <!--
    定义resultMap
    将SELECT id id_,username username_ FROM USER 和User类中的属性做一个映射关系

    type:resultMap最终映射的java对象类型，可以使用别名
    id:对resultMap的唯一标识。
     -->
    <resultMap type="User" id="userResultMap">
        <!--
        id:表示查询结果集中唯一的标识。
        column:查询出来的列名
        property:type指定的pojo类型中的属性名
        最终resultMap对column和property作一个映射关系（对应关系）

         -->
        <id column="id_" property="id"/>
        <result column="username_" property="username"/>
    </resultMap>

     <!--
        id:表示查询结果集中唯一的标识。
        这里的resultMap要和<resultMap type="User" id="userResultMap">一致

         -->

        <select id="findUserByResultMap" parameterType="cn.itcast.mybatis.po.UserQueryVo" resultMap="userResultMap">
        SELECT id id_,username username_ FROM USER WHERE user.sex= #{userCustom.sex} AND user.username=#{userCustom.username}
    </select>

</mapper>

第二步：编写Mapper.java类

package cn.itcast.mybatis.mapper;

import java.util.List;

import cn.itcast.mybatis.po.User;
import cn.itcast.mybatis.po.UserCustom;
import cn.itcast.mybatis.po.UserQueryVo;

public interface userMapper {
    //这个名字（findUserById）和UserMapper.xml里面的id要一模一样
//注意这里写的是返回的List.这样代码内部就会调用selectList，但是在userMapper.xml中要写的是
//resultType="cn.itcast.mybatis.po.User"
/*
 *
 <select id="findUserList" parameterType="cn.itcast.mybatis.po.UserQueryVo" resultType="cn.itcast.mybatis.po.UserCustom">
        SELECT * FROM USER WHERE user.sex= #{userCustom.sex} AND user.username=#{userCustom.username}
    </select>
 *
 *
 */
public List<UserCustom> findUserList(UserQueryVo userQueryVo);
public User findUserByResultMap(UserQueryVo userQueryVo);
}

第三步：编写测试代码：

package cn.itcast.mybatis.first;

import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.List;

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

import cn.itcast.mybatis.Dao.UserMapper;
import cn.itcast.mybatis.mapper.userMapper;
import cn.itcast.mybatis.po.User;
import cn.itcast.mybatis.po.UserCustom;
import cn.itcast.mybatis.po.UserQueryVo;

public class Mybatis_mappertest {

    private SqlSessionFactory sqlSessionFactory;
    @Before
    public void setup() throws IOException
    {   String resource="SqlMapConfig.xml";
        InputStream inputStream= Resources.getResourceAsStream(resource);
        //主要是生成SqlsessionFactory。
        this.sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
    }
    @Test
    public void testMaper()
    {
        SqlSession sqlSession=null;

        sqlSession=sqlSessionFactory.openSession();
        //生成代理类
        userMapper userMapper=sqlSession.getMapper(userMapper.class);
    //创建包装对象，设置查询条件
        UserQueryVo userQueryVo=new UserQueryVo();
        UserCustom userCustom=new UserCustom();

        userCustom.setSex("1");
        userCustom.setUsername("王");
        userQueryVo.setUserCustom(userCustom);

        userMapper.findUserByResultMap(userQueryVo);

    }

}

运行结果：正确。

总结：

使用resultType进行输出映射，只有查询出来的列名和pojo中的属性名一致，该列才可以映射成功。

如果查询出来的列名和pojo的属性名不一致，通过定义一个resultMap对列名和pojo属性名之间作一个映射关系。