# mycat

**Repository Path**: jample/mycat

## Basic Information

- **Project Name**: mycat
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-09-03
- **Last Updated**: 2021-11-02

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# 工程简介

linux安装

**mycat**的简单应用

file文件夹有配置好的mycat包，和dockerfile可在docker运行mycat

**docker启动指令**

```
docker run --name mycat -p 8066:8066 -p 9066:9066 -v /home/dgb/mycat/conf:/usr/local/mycat/conf -v /home/dgb/mycat/logs:/usr/local/mycat/logs -d mycat-1.6
```

**特别注意**：/home/dgb/mycat/conf和/home/dgb/mycat/logs是你mycat的config目录对于的目录

## 对数据库操作

**创建数据库**

```
3个分库mycat_db1，mycat_db2，mycat_db3
```

**执行sql**

```
CREATE TABLE `test` (
  `sid` bigint(20) NOT NULL,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`sid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
```

**修改schema文件**

```html
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">

	<schema name="TESTDB" checkSQLschema="true" sqlMaxLimit="100" >
			<table name="test"  dataNode="dn1,dn2,dn3" rule="auto-sharding-long">
			</table>
	</schema>
	<!-- <dataNode name="dn1$0-743" dataHost="localhost1" database="db$0-743"
		/> -->
	<dataNode name="dn1" dataHost="localhost1" database="mycat_db1" />
	<dataNode name="dn2" dataHost="localhost1" database="mycat_db2" />
	<dataNode name="dn3" dataHost="localhost1" database="mycat_db3" />
	<dataHost name="localhost1" maxCon="1000" minCon="10" balance="0"
			  writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
		<heartbeat>select user()</heartbeat>
		<!-- can have multi write hosts -->
		<writeHost host="hostM1" url="121.196.161.150:3306" user="你的账号"
				   password="你的密码">
		</writeHost>
		<!-- <writeHost host="hostM2" url="localhost:3316" user="root" password="123456"/> -->
	</dataHost>
	
</mycat:schema>
```

1. 里面的writeHost的信息，修改为你的mysql数据库信息
2. dataNode里的database修改为你的数据库名默认是按之前步骤创建的mycat_db1，mycat_db2，mycat_db3

**修改rule文件**

```html
	<tableRule name="auto-sharding-long">
		<rule>
			<columns>sid</columns>
			<algorithm>rang-long</algorithm>
		</rule>
	</tableRule>
```

设置分片的列为sid

**修改函数文件**mycat/conf/autopartition-long.txt

```
# range start-end ,data node index
# K=1000,M=10000.
# 按id范围分片
0-5K=0
5K-10K=1
10K-15K=2
```

**修改server文件**

```html
<user name="root" >
		<property name="password">123456</property>
		<property name="schemas">TESTDB</property>
		<property name="defaultSchema">TESTDB</property>
		<!--No MyCAT Database selected 错误前会尝试使用该schema作为schema，不设置则为null,报错 -->
		
		<!-- 表级 DML 权限设置 -->
		<!-- 		
		<privileges check="false">
			<schema name="TESTDB" dml="0110" >
				<table name="tb01" dml="0000"></table>
				<table name="tb02" dml="1111"></table>
			</schema>
		</privileges>		
		 -->
	</user>

	<user name="user">
		<property name="password">user</property>
		<property name="schemas">TESTDB</property>
		<property name="readOnly">true</property>
		<property name="defaultSchema">TESTDB</property>
	</user>
```

设置mycat的登陆信息

**用navicat连接mycat**

```
# 数据库连接地址
spring.datasource.url=jdbc:mysql://mycat的ip地址:8066/TESTDB?serverTimezone=UTC
# 数据库用户名&密码：
spring.datasource.username=root
spring.datasource.password=123456
```

**插入观看**，插入id为

0~5000

5000~10000

10000~15000的数据，观看数据是否正确分库

**完成**

# 延伸阅读