98 lines
2.9 KiB
Markdown
98 lines
2.9 KiB
Markdown
## TDengine SpringBoot + Mybatis Demo
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## 需要提前创建 test 数据库
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### 配置 application.properties
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```properties
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# datasource config
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spring.datasource.driver-class-name=com.taosdata.jdbc.TSDBDriver
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spring.datasource.url=jdbc:TAOS://127.0.0.1:6030/test
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spring.datasource.username=root
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spring.datasource.password=taosdata
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spring.datasource.druid.initial-size=5
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spring.datasource.druid.min-idle=5
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spring.datasource.druid.max-active=5
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# max wait time for get connection, ms
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spring.datasource.druid.max-wait=60000
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spring.datasource.druid.validation-query=select server_status();
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spring.datasource.druid.validation-query-timeout=5000
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spring.datasource.druid.test-on-borrow=false
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spring.datasource.druid.test-on-return=false
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spring.datasource.druid.test-while-idle=true
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spring.datasource.druid.time-between-eviction-runs-millis=60000
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spring.datasource.druid.min-evictable-idle-time-millis=600000
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spring.datasource.druid.max-evictable-idle-time-millis=900000
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# mybatis
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mybatis.mapper-locations=classpath:mapper/*.xml
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# log
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logging.level.com.taosdata.jdbc.springbootdemo.dao=debug
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```
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### 主要功能
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* 创建数据库和表
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```xml
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<!-- weatherMapper.xml -->
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<update id="createDB" >
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create database if not exists test;
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</update>
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<update id="createTable" >
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create table if not exists test.weather(ts timestamp, temperature int, humidity float);
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</update>
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```
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* 插入单条记录
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```xml
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<!-- weatherMapper.xml -->
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<insert id="insert" parameterType="Weather" >
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insert into test.weather (ts, temperature, humidity) values (now, #{temperature,jdbcType=INTEGER}, #{humidity,jdbcType=FLOAT})
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</insert>
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```
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* 插入多条记录
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```xml
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<!-- weatherMapper.xml -->
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<insert id="batchInsert" parameterType="java.util.List" >
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insert into test.weather (ts, temperature, humidity) values
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<foreach separator=" " collection="list" item="weather" index="index" >
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(now + #{index}a, #{weather.temperature}, #{weather.humidity})
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</foreach>
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</insert>
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```
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* 分页查询
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```xml
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<!-- weatherMapper.xml -->
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="WeatherMapper">
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<resultMap id="BaseResultMap" type="Weather">
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<id column="ts" jdbcType="TIMESTAMP" property="ts" />
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<result column="temperature" jdbcType="INTEGER" property="temperature" />
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<result column="humidity" jdbcType="FLOAT" property="humidity" />
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</resultMap>
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<sql id="Base_Column_List">
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ts, temperature, humidity
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</sql>
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<select id="select" resultMap="BaseResultMap">
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select
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<include refid="Base_Column_List" />
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from test.weather
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order by ts desc
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<if test="limit != null">
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limit #{limit,jdbcType=BIGINT}
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</if>
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<if test="offset != null">
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offset #{offset,jdbcType=BIGINT}
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</if>
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</select>
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</mapper>
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```
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