mybatis 中xml相关属性的含义

<?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">
//mappe可以在cfg.xml做映射也可以在写sqlxml中直接做映射，namespace当前写//sql的xml 
<mapper namespace="cn.tssit.meteorserver.mapper.auto.MeteorDataAutoMapper">
//resutMap吧对应表映射，id 他的唯一标识，type是你封装的pojo,
// column 数据库中字段属性，property是你封装字段的属性，jdbcType数据库字段类//型
    <resultMap id="baseResultMap" type="cn.tssit.meteorserver.domain.MeteorData">
        <id column="ID" property="id" jdbcType="DECIMAL" />
        <result column="SURVEYDATE" property="surveydate" jdbcType="TIMESTAMP" />
        <result column="USAF" property="usaf" jdbcType="NVARCHAR" />
        <result column="TEMPERATURE" property="temperature" jdbcType="DECIMAL" />
        <result column="PRESSURE" property="pressure" jdbcType="DECIMAL" />
        <result column="WATER_VAPOR_PRESSURE" property="waterVaporPressure" jdbcType="DECIMAL" />
        <result column="SEA_SURFACE_TEMPERATURE" property="seaSurfaceTemperature" jdbcType="DECIMAL" />
        <result column="RELATIVE_HUMIDITY" property="relativeHumidity" jdbcType="DECIMAL" />
        <result column="WIND_DIR" property="windDir" jdbcType="DECIMAL" />
        <result column="WIND_SPEED" property="windSpeed" jdbcType="DECIMAL" />
        <result column="PRECIPITATION" property="precipitation" jdbcType="DECIMAL" />
        <result column="PRECIPITATION_CODE" property="precipitationCode" jdbcType="DECIMAL" />
        <result column="CEILING_HEIGHT" property="ceilingHeight" jdbcType="DECIMAL" />
        <result column="OPAQUE_SKY_COVER" property="opaqueSkyCover" jdbcType="DECIMAL" />
        <result column="TRANSPARENCY_SKY_COVER" property="transparencySkyCover" jdbcType="DECIMAL" />
        <result column="HEIGHT_ABOVE_SEA_LEVEL" property="heightAboveSeaLevel" jdbcType="DECIMAL" />
        <result column="OVERWATER_MIXING_HEIGHT" property="overwaterMixingHeight" jdbcType="DECIMAL" />
        <result column="TEMPERATURE_LAPSE_RATE_BELOW" property="temperatureLapseRateBelow" jdbcType="DECIMAL" />
        <result column="TEMPERATURE_LAPSE_RATE_ABOVE" property="temperatureLapseRateAbove" jdbcType="DECIMAL" />
        <result column="TYPE" property="type" jdbcType="DECIMAL" />
        <result column="DOMINANT_WAVE_PERIOD" property="dominantWavePeriod" jdbcType="DECIMAL" />
        <result column="DOMINANT_WAVE_HEIGHT" property="dominantWaveHeight" jdbcType="DECIMAL" />
    </resultMap>

    <sql id="selectSql">
        select <foreach collection="selector.fields" item="item" index="index" separator=",">${item}</foreach> from ${selector.table}
        <if test="selector.joinTables != null">
            <foreach collection="selector.joinTables" item="item" index="index" separator=" ">${item.join} join ${item}
                <if test="item.ons != null">on <foreach collection="item.ons" item="on" index="i" separator=" and ">${on.joinField}=${on.relateField}</foreach></if>
            </foreach>
        </if>
        <if test="selector.wheres != null">
            WHERE
            <foreach collection="selector.wheres" item="item" index="index" separator=" ">
                <if test="item.prefix != null">${item.prefix}</if> <if test="item.value != null">#{item.value}</if> <if test="item.suffix != null">${item.suffix}</if>
            </foreach>
        </if>
        <if test="selector.groupFields != null">
            group by <foreach collection="selector.groupFields" item="item" index="index" separator=",">${item}</foreach>
        </if>
        <if test="selector.orderFields != null">
            order by <foreach collection="selector.orderFields" item="item" index="index" separator=",">${item}</foreach>
        </if>
    </sql>

    <sql id="whereSql">
        <if test="wheres != null">
            WHERE
            <foreach collection="wheres" item="item" index="index" separator=" ">
                <if test="item.prefix != null">${item.prefix}</if> <if test="item.value != null">#{item.value}</if> <if test="item.suffix != null">${item.suffix}</if>
            </foreach>
        </if>
    </sql>
//id对应dao中使用唯一标识，parameterType输入参数的类型如果是传多个使用map//那么确保前段传过来的是key,value，requestType返回类型（一般封装后都是类类
//型）,resultMap引用的表，
// <include refid="selectSql"/>重复使用一条sql ，refid指向你要用sql id
//连表查询时可以使用<requestMap extendx="对应表requestMap 的id">

    <select id="select" parameterType="com.hjp.sqlbuild.Selector" resultMap="baseResultMap">//要用到表属性id
        <include refid="selectSql"/>
    </select>
    <select id="selectPage" parameterType="com.hjp.sqlbuild.Selector" resultMap="baseResultMap">
        <include refid="selectSql"/>
    </select>
    <select id="selectForListMap" resultType="map" parameterType="com.hjp.sqlbuild.Selector">
        <include refid="selectSql"/>
    </select>
    <select id="selectPageForListMap" resultType="map" parameterType="com.hjp.sqlbuild.Selector">
        <include refid="selectSql"/>
    </select>

    <insert id="insert" parameterType="cn.tssit.meteorserver.domain.MeteorData" useGeneratedKeys="true" keyColumn="ID" keyProperty="id">
        insert into TSSI_METEOR_DATA(ID,SURVEYDATE,USAF,TEMPERATURE,PRESSURE,WATER_VAPOR_PRESSURE,SEA_SURFACE_TEMPERATURE,RELATIVE_HUMIDITY,WIND_DIR,WIND_SPEED,PRECIPITATION,PRECIPITATION_CODE,CEILING_HEIGHT,OPAQUE_SKY_COVER,TRANSPARENCY_SKY_COVER,HEIGHT_ABOVE_SEA_LEVEL,OVERWATER_MIXING_HEIGHT,TEMPERATURE_LAPSE_RATE_BELOW,TEMPERATURE_LAPSE_RATE_ABOVE,TYPE,DOMINANT_WAVE_PERIOD,DOMINANT_WAVE_HEIGHT)
        values(#{id,jdbcType=DECIMAL},#{surveydate,jdbcType=TIMESTAMP},#{usaf,jdbcType=NVARCHAR},#{temperature,jdbcType=DECIMAL},#{pressure,jdbcType=DECIMAL},#{waterVaporPressure,jdbcType=DECIMAL},#{seaSurfaceTemperature,jdbcType=DECIMAL},#{relativeHumidity,jdbcType=DECIMAL},#{windDir,jdbcType=DECIMAL},#{windSpeed,jdbcType=DECIMAL},#{precipitation,jdbcType=DECIMAL},#{precipitationCode,jdbcType=DECIMAL},#{ceilingHeight,jdbcType=DECIMAL},#{opaqueSkyCover,jdbcType=DECIMAL},#{transparencySkyCover,jdbcType=DECIMAL},#{heightAboveSeaLevel,jdbcType=DECIMAL},#{overwaterMixingHeight,jdbcType=DECIMAL},#{temperatureLapseRateBelow,jdbcType=DECIMAL},#{temperatureLapseRateAbove,jdbcType=DECIMAL},#{type,jdbcType=DECIMAL},#{dominantWavePeriod,jdbcType=DECIMAL},#{dominantWaveHeight,jdbcType=DECIMAL})
    </insert>

    <insert id="insertSelective" parameterType="cn.tssit.meteorserver.domain.MeteorData" useGeneratedKeys="true" keyColumn="ID" keyProperty="id">
        insert into TSSI_METEOR_DATA
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="id != null">
                ID,
            </if>
            <if test="surveydate != null">
                SURVEYDATE,
            </if>
            <if test="usaf != null">
                USAF,
            </if>
            <if test="temperature != null">
                TEMPERATURE,
            </if>
            <if test="pressure != null">
                PRESSURE,
            </if>
            <if test="waterVaporPressure != null">
                WATER_VAPOR_PRESSURE,
            </if>
            <if test="seaSurfaceTemperature != null">
                SEA_SURFACE_TEMPERATURE,
            </if>
            <if test="relativeHumidity != null">
                RELATIVE_HUMIDITY,
            </if>
            <if test="windDir != null">
                WIND_DIR,
            </if>
            <if test="windSpeed != null">
                WIND_SPEED,
            </if>
            <if test="precipitation != null">
                PRECIPITATION,
            </if>
            <if test="precipitationCode != null">
                PRECIPITATION_CODE,
            </if>
            <if test="ceilingHeight != null">
                CEILING_HEIGHT,
            </if>
            <if test="opaqueSkyCover != null">
                OPAQUE_SKY_COVER,
            </if>
            <if test="transparencySkyCover != null">
                TRANSPARENCY_SKY_COVER,
            </if>
            <if test="heightAboveSeaLevel != null">
                HEIGHT_ABOVE_SEA_LEVEL,
            </if>
            <if test="overwaterMixingHeight != null">
                OVERWATER_MIXING_HEIGHT,
            </if>
            <if test="temperatureLapseRateBelow != null">
                TEMPERATURE_LAPSE_RATE_BELOW,
            </if>
            <if test="temperatureLapseRateAbove != null">
                TEMPERATURE_LAPSE_RATE_ABOVE,
            </if>
            <if test="type != null">
                TYPE,
            </if>
            <if test="dominantWavePeriod != null">
                DOMINANT_WAVE_PERIOD,
            </if>
            <if test="dominantWaveHeight != null">
                DOMINANT_WAVE_HEIGHT,
            </if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="id != null">
                #{id,jdbcType=DECIMAL},
            </if>
            <if test="surveydate != null">
                #{surveydate,jdbcType=TIMESTAMP},
            </if>
            <if test="usaf != null">
                #{usaf,jdbcType=NVARCHAR},
            </if>
            <if test="temperature != null">
                #{temperature,jdbcType=DECIMAL},
            </if>
            <if test="pressure != null">
                #{pressure,jdbcType=DECIMAL},
            </if>
            <if test="waterVaporPressure != null">
                #{waterVaporPressure,jdbcType=DECIMAL},
            </if>
            <if test="seaSurfaceTemperature != null">
                #{seaSurfaceTemperature,jdbcType=DECIMAL},
            </if>
            <if test="relativeHumidity != null">
                #{relativeHumidity,jdbcType=DECIMAL},
            </if>
            <if test="windDir != null">
                #{windDir,jdbcType=DECIMAL},
            </if>
            <if test="windSpeed != null">
                #{windSpeed,jdbcType=DECIMAL},
            </if>
            <if test="precipitation != null">
                #{precipitation,jdbcType=DECIMAL},
            </if>
            <if test="precipitationCode != null">
                #{precipitationCode,jdbcType=DECIMAL},
            </if>
            <if test="ceilingHeight != null">
                #{ceilingHeight,jdbcType=DECIMAL},
            </if>
            <if test="opaqueSkyCover != null">
                #{opaqueSkyCover,jdbcType=DECIMAL},
            </if>
            <if test="transparencySkyCover != null">
                #{transparencySkyCover,jdbcType=DECIMAL},
            </if>
            <if test="heightAboveSeaLevel != null">
                #{heightAboveSeaLevel,jdbcType=DECIMAL},
            </if>
            <if test="overwaterMixingHeight != null">
                #{overwaterMixingHeight,jdbcType=DECIMAL},
            </if>
            <if test="temperatureLapseRateBelow != null">
                #{temperatureLapseRateBelow,jdbcType=DECIMAL},
            </if>
            <if test="temperatureLapseRateAbove != null">
                #{temperatureLapseRateAbove,jdbcType=DECIMAL},
            </if>
            <if test="type != null">
                #{type,jdbcType=DECIMAL},
            </if>
            <if test="dominantWavePeriod != null">
                #{dominantWavePeriod,jdbcType=DECIMAL},
            </if>
            <if test="dominantWaveHeight != null">
                #{dominantWaveHeight,jdbcType=DECIMAL},
            </if>
        </trim>
    </insert>

    <update id="update" parameterType="map">
        update TSSI_METEOR_DATA set
        SURVEYDATE = #{record.surveydate,jdbcType=TIMESTAMP}
        ,USAF = #{record.usaf,jdbcType=NVARCHAR}
        ,TEMPERATURE = #{record.temperature,jdbcType=DECIMAL}
        ,PRESSURE = #{record.pressure,jdbcType=DECIMAL}
        ,WATER_VAPOR_PRESSURE = #{record.waterVaporPressure,jdbcType=DECIMAL}
        ,SEA_SURFACE_TEMPERATURE = #{record.seaSurfaceTemperature,jdbcType=DECIMAL}
        ,RELATIVE_HUMIDITY = #{record.relativeHumidity,jdbcType=DECIMAL}
        ,WIND_DIR = #{record.windDir,jdbcType=DECIMAL}
        ,WIND_SPEED = #{record.windSpeed,jdbcType=DECIMAL}
        ,PRECIPITATION = #{record.precipitation,jdbcType=DECIMAL}
        ,PRECIPITATION_CODE = #{record.precipitationCode,jdbcType=DECIMAL}
        ,CEILING_HEIGHT = #{record.ceilingHeight,jdbcType=DECIMAL}
        ,OPAQUE_SKY_COVER = #{record.opaqueSkyCover,jdbcType=DECIMAL}
        ,TRANSPARENCY_SKY_COVER = #{record.transparencySkyCover,jdbcType=DECIMAL}
        ,HEIGHT_ABOVE_SEA_LEVEL = #{record.heightAboveSeaLevel,jdbcType=DECIMAL}
        ,OVERWATER_MIXING_HEIGHT = #{record.overwaterMixingHeight,jdbcType=DECIMAL}
        ,TEMPERATURE_LAPSE_RATE_BELOW = #{record.temperatureLapseRateBelow,jdbcType=DECIMAL}
        ,TEMPERATURE_LAPSE_RATE_ABOVE = #{record.temperatureLapseRateAbove,jdbcType=DECIMAL}
        ,TYPE = #{record.type,jdbcType=DECIMAL}
        ,DOMINANT_WAVE_PERIOD = #{record.dominantWavePeriod,jdbcType=DECIMAL}
        ,DOMINANT_WAVE_HEIGHT = #{record.dominantWaveHeight,jdbcType=DECIMAL}
        <include refid="whereSql"/>
    </update>

    <update id="updateSelective" parameterType="map">
        update TSSI_METEOR_DATA
        <set>
            <if test="record.surveydate != null">
                SURVEYDATE = #{record.surveydate,jdbcType=TIMESTAMP},
            </if>
            <if test="record.usaf != null">
                USAF = #{record.usaf,jdbcType=NVARCHAR},
            </if>
            <if test="record.temperature != null">
                TEMPERATURE = #{record.temperature,jdbcType=DECIMAL},
            </if>
            <if test="record.pressure != null">
                PRESSURE = #{record.pressure,jdbcType=DECIMAL},
            </if>
            <if test="record.waterVaporPressure != null">
                WATER_VAPOR_PRESSURE = #{record.waterVaporPressure,jdbcType=DECIMAL},
            </if>
            <if test="record.seaSurfaceTemperature != null">
                SEA_SURFACE_TEMPERATURE = #{record.seaSurfaceTemperature,jdbcType=DECIMAL},
            </if>
            <if test="record.relativeHumidity != null">
                RELATIVE_HUMIDITY = #{record.relativeHumidity,jdbcType=DECIMAL},
            </if>
            <if test="record.windDir != null">
                WIND_DIR = #{record.windDir,jdbcType=DECIMAL},
            </if>
            <if test="record.windSpeed != null">
                WIND_SPEED = #{record.windSpeed,jdbcType=DECIMAL},
            </if>
            <if test="record.precipitation != null">
                PRECIPITATION = #{record.precipitation,jdbcType=DECIMAL},
            </if>
            <if test="record.precipitationCode != null">
                PRECIPITATION_CODE = #{record.precipitationCode,jdbcType=DECIMAL},
            </if>
            <if test="record.ceilingHeight != null">
                CEILING_HEIGHT = #{record.ceilingHeight,jdbcType=DECIMAL},
            </if>
            <if test="record.opaqueSkyCover != null">
                OPAQUE_SKY_COVER = #{record.opaqueSkyCover,jdbcType=DECIMAL},
            </if>
            <if test="record.transparencySkyCover != null">
                TRANSPARENCY_SKY_COVER = #{record.transparencySkyCover,jdbcType=DECIMAL},
            </if>
            <if test="record.heightAboveSeaLevel != null">
                HEIGHT_ABOVE_SEA_LEVEL = #{record.heightAboveSeaLevel,jdbcType=DECIMAL},
            </if>
            <if test="record.overwaterMixingHeight != null">
                OVERWATER_MIXING_HEIGHT = #{record.overwaterMixingHeight,jdbcType=DECIMAL},
            </if>
            <if test="record.temperatureLapseRateBelow != null">
                TEMPERATURE_LAPSE_RATE_BELOW = #{record.temperatureLapseRateBelow,jdbcType=DECIMAL},
            </if>
            <if test="record.temperatureLapseRateAbove != null">
                TEMPERATURE_LAPSE_RATE_ABOVE = #{record.temperatureLapseRateAbove,jdbcType=DECIMAL},
            </if>
            <if test="record.type != null">
                TYPE = #{record.type,jdbcType=DECIMAL},
            </if>
            <if test="record.dominantWavePeriod != null">
                DOMINANT_WAVE_PERIOD = #{record.dominantWavePeriod,jdbcType=DECIMAL},
            </if>
            <if test="record.dominantWaveHeight != null">
                DOMINANT_WAVE_HEIGHT = #{record.dominantWaveHeight,jdbcType=DECIMAL},
            </if>
        </set>
        <include refid="whereSql"/>
    </update>

    <delete id="delete" parameterType="map">
        delete from TSSI_METEOR_DATA
        <include refid="whereSql"/>
    </delete>

</mapper>
具体实例

1、数据库

在MySQL中，test数据库下，简历user表，字段：id，name，password，建表语句略。

2、需导入的包

只有两个： mybatis-3.0.3.jar mysql-connector-java-5.1.16-bin.jar（JDBC包）

3、目录结构

采用最简单的结构，com.mybatis包下有且仅有四个文件：configuration.xml、user.xml、User.java、Test.java 。

 

 

 

4、mybatis配置文件configuration.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> 
<typeAliases> 
<typeAlias alias="User" type="com.mybatis.User"></typeAlias> 
</typeAliases> 
<environments default="development"> 
<environment id="development"> 
<transactionManager type="JDBC"></transactionManager> 
<dataSource type="POOLED"> 
<property name="driver" value="com.mysql.jdbc.Driver" /> 
<property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8" /> 
<property name="username" value="root" /> 
<property name="password" value="123456" /> 
</dataSource> 
</environment> 
</environments> 
<mappers> 
<mapper resource="user.xml"/> 
</mappers> 
</configuration>

 

5、User表sql文件User.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="User"> 
<select id="selectUser" parameterType="int" resultType="User"> 
SELECT * FROM user WHERE id = #{id} 
</select> 
<select id="selectUsers" resultType="User"> 
SELECT * FROM user 
</select> 
</mapper>

6、表结构文件User.java

package com.mybatis; 
public class User { 
private int id; 
private String name; 
private String password; 
public User(){} 
public User(int id, String name) { 
this.id = id; 
this.name = name; 
} 
public int getId() { 
return this.id; 
} 
public void setId(int id) { 
this.id = id; 
} 
public String getName() { 
return this.name; 
} 
public void setName(String name) { 
this.name = name; 
} 
public String getPassword() { 
return this.password; 
} 
public void setPassword(String password) { 
this.password = password; 
} 
@Override
public String toString() { 
return "User [id=" + this.id + ", name=" + this.name + ", password=" + this.password + "]"; 
} 
}

7、测试用例Test.java

package com.mybatis; 
import java.io.IOException; 
import java.io.Reader; 
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; 
public class Test { 
public static void main(String[] args) throws IOException { 
String resource = "configuration.xml"; 
Reader reader = Resources.getResourceAsReader(resource); 
SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader); 
SqlSession session = ssf.openSession(); 
try{ 
User user = session.selectOne("selectUser", "1"); 
System.out.println(user.getName()); 
System.out.println(user); 
System.out.println("--------------分隔线---------------"); 
List<User> users = session.selectList("selectUsers"); 
for(int i=0; i<users.size(); i++) { 
System.out.println(users.get(i).getName()); 
} 
} catch (Exception e) { 
e.printStackTrace(); 
} finally { 
session.close(); 
} 
} 
}

 

 

 

package com.mybatis;

public class User {

private int id;

private String name;

private String password;

public User(){}

public User(int id, String name) {

this.id = id;

this.name = name;

}

public int getId() {

return this.id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return this.name;

}

public void setName(String name) {

this.name = name;

}

public String getPassword() {

return this.password;

}

public void setPassword(String password) {

this.password = password;

}

@Override

public String toString() {

return "User [id=" + this.id + ", name=" + this.name + ", password=" + this.password + "]";

}

}

7、测试用例Test.java

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

package com.mybatis; import java.io.IOException; import java.io.Reader; 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; public class Test { public static void main(String[] args) throws IOException { String resource = "configuration.xml"; Reader reader = Resources.getResourceAsReader(resource); SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader); SqlSession session = ssf.openSession(); try{ User user = session.selectOne("selectUser", "1"); System.out.println(user.getName()); System.out.println(user); System.out.println("--------------分隔线---------------"); List<User> users = session.selectList("selectUsers"); for(int i=0; i<users.size(); i++) { System.out.println(users.get(i).getName()); } } catch (Exception e) { e.printStackTrace(); } finally { session.close(); } } }

以上所述是小编给大家介绍的Java持久层框架MyBatis简单实例，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！

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