java 手动分表（100张表）

之前做项目，因为数据量比较大，所以涉及到分库分表。分库自然不必多说，自然是读写分离。分表我们直接是做的数据的水平切割，将大量数据均匀分布到100张表中。

我们分表的依据是用户id和用户证件号码的出生日期对10取模。

首先说一下第一种方法，使用用户id对100取模获取用户渠道表的user_channel_0到user_channel_99，上代码。

抽象规范类：

package com.cmbc.smp.busi; 

public abstract class PartTableManage <P,O> { 

P p; 
O o; 

public abstract void init(); 

public abstract O getPartTableName(P param); 
}

定义类

package com.cmbc.smp.busi; 

public class UserChannelDimension { 

public static final int MODEL = 100; 

public static final String MAIN_TABLE = "user_channel_info"; 

public static final String UNDERLINE = "_"; 

public static final int TABLE_NUM = 100; 

private int tableSeq ; 

private int partFieldValue; 

public UserChannelDimension(){ 

} 

public UserChannelDimension(int tableSeq, int partFieldValue){ 

this.tableSeq = tableSeq; 
this.partFieldValue = partFieldValue; 

} 

public int getTableSeq() { 
return tableSeq; 
} 

public void setTableSeq(int tableSeq) { 
this.tableSeq = tableSeq; 
} 

public int getPartFieldValue() { 
return partFieldValue; 
} 

public void setPartFieldValue(int partFieldValue) { 
this.partFieldValue = partFieldValue; 
} 




}

分表类：

package com.cmbc.smp.busi; 

import java.util.ArrayList; 
import java.util.List; 

import org.apache.commons.collections.CollectionUtils; 
import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 

public class UserChannelPartTableManage extends PartTableManage<UserChannelDimension, List<String>>{ 

private static final Logger logger = LoggerFactory.getLogger(UserChannelPartTableManage.class); 

@Override 
public void init() { 

if(CollectionUtils.isEmpty(this.o)){ 
o = new ArrayList<String>(UserChannelDimension.TABLE_NUM); 
}else{ 
o.clear(); 
} 

for(int m = 0; m < UserChannelDimension.MODEL; m++ ){ 
this.o.add(UserChannelDimension.MAIN_TABLE + UserChannelDimension.UNDERLINE + m); 
} 

logger.info("user_channel_info分表加载成功！"); 

} 

@Override 
public List<String> getPartTableName(UserChannelDimension param) { 
List<String> tables = null; 
//包含如下情形： 
//1.参数为空或者partFieldValue = -1，说明是获取全部分表名称 
//2.PARAM非空，并且partFieldValue大于-1，则直接用partFieldValue对UserDimension.model取模，获得分表名 
if(null == param ||param.getPartFieldValue() == -1){ 
return this.o; 
} 

if(param.getPartFieldValue() > -1){ 
param.setTableSeq(param.getPartFieldValue() % UserChannelDimension.MODEL); 
tables = new ArrayList<String>(1); 
tables.add(UserChannelDimension.MAIN_TABLE + UserChannelDimension.UNDERLINE + param.getTableSeq()); 

} 
//其他情形暂不支持 
return tables; 
} 

}

第二种方法：根据用户id和身份证日期的日期对10取模，获取100张表。user_0_0到user_9_9

上代码：

定义类：

package com.cmbc.smp.busi; 

public class UserDimension { 

public static final int TABLE_NUM = 100; 

public static final int MODEL_ONE = 10; 

public static final int MODEL_TWO = 10; 

public static final String MAIN_TABLE = "user_info"; 

public static final String UNDERLINE = "_"; 

public UserDimension(){ 
this.dimensionOneTable = -1; 
this.dimensionOneValue = -1; 
this.dimensionTwoTable = -1; 
this.dimensionTwoValue = -1; 
} 

public UserDimension(int dimensionOneTable,int dimensionOneValue,int dimensionTwoTable,int dimensionTwoValue){ 

this.dimensionOneTable = dimensionOneTable; 
this.dimensionOneValue = dimensionOneValue; 
this.dimensionTwoTable = dimensionTwoTable; 
this.dimensionTwoValue = dimensionTwoValue; 

} 

private int dimensionOneTable; 

private int dimensionTwoTable; 

private int dimensionOneValue; 

private int dimensionTwoValue; 

public int getDimensionOneTable() { 
return dimensionOneTable; 
} 

public void setDimensionOneTable(int dimensionOneTable) { 
this.dimensionOneTable = dimensionOneTable; 
} 

public int getDimensionTwoTable() { 
return dimensionTwoTable; 
} 

public void setDimensionTwoTable(int dimensionTwoTable) { 
this.dimensionTwoTable = dimensionTwoTable; 
} 

public int getDimensionOneValue() { 
return dimensionOneValue; 
} 

public void setDimensionOneValue(int dimensionOneValue) { 
this.dimensionOneValue = dimensionOneValue; 
} 

public int getDimensionTwoValue() { 
return dimensionTwoValue; 
} 

public void setDimensionTwoValue(int dimensionTwoValue) { 
this.dimensionTwoValue = dimensionTwoValue; 
} 

}

分表类：

package com.cmbc.smp.busi; 

import java.util.ArrayList; 
import java.util.List; 

import org.apache.commons.collections.CollectionUtils; 
import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 


public class UserPartTableManage extends PartTableManage<UserDimension, List<String>>{ 

private static final Logger logger = LoggerFactory.getLogger(UserPartTableManage.class); 
/** 
* 初始化方法，加载所有表名成至List<String> 
*/ 
@Override 
public void init() { 
//根据userID对10取模，身份证生日中的日对10取模，总共一百张分表，形如user_info_X_Y 
if(CollectionUtils.isEmpty(this.o)){ 
o = new ArrayList<String>(UserDimension.TABLE_NUM); 
}else{ 
o.clear(); 
} 

for(int m = 0; m < UserDimension.MODEL_ONE; m++ ){ 
for(int n = 0; n< UserDimension.MODEL_TWO; n++){ 
this.o.add(UserDimension.MAIN_TABLE + UserDimension.UNDERLINE + m + UserDimension.UNDERLINE + n); 
} 
} 

logger.info("user_info分表加载成功！"); 
} 


@Override 
public List<String> getPartTableName(UserDimension param) { 

List<String> tables = null; 
//1.四个字段都无有效值，说明是返回所有分表名的集合 
//2.判断分表位置是否有值，若有值则直接替换 
if(null == param){ 
return this.o; 
} 

//获取全部分表 
if(param.getDimensionOneTable() <0 && param.getDimensionTwoTable() < 0 
&& param.getDimensionOneValue() < 0 &&param.getDimensionTwoValue() < 0 ){ 

return this.o; 

} 

//根据用户id获取所有此用户维度的所有10个分表 
if(param.getDimensionOneValue() > -1 && param.getDimensionTwoValue() < 0){ 
tables = new ArrayList<String>(UserDimension.MODEL_TWO); 
//用户分表号 
param.setDimensionOneTable(param.getDimensionOneValue()%UserDimension.MODEL_ONE); 

for(int k = 0 ; k < UserDimension.MODEL_TWO ; k ++ ){ 

tables.add(UserDimension.MAIN_TABLE + UserDimension.UNDERLINE + param.getDimensionOneTable() + UserDimension.UNDERLINE + k); 

} 

return tables; 
} 

//根据证件号生日的日获取此生日维度所有10个分表 
if(param.getDimensionTwoValue() > -1 && param.getDimensionOneValue() < 0){ 
tables = new ArrayList<String>(UserDimension.MODEL_ONE); 
//用户分表号 
param.setDimensionTwoTable(param.getDimensionTwoValue()%UserDimension.MODEL_TWO); 

for(int k = 0 ; k < UserDimension.MODEL_ONE ; k ++ ){ 

tables.add(UserDimension.MAIN_TABLE + UserDimension.UNDERLINE + k + UserDimension.UNDERLINE + param.getDimensionTwoTable()); 

} 

return tables; 
} 


//根据用户id和生日获取精确的一张分表 

if(param.getDimensionOneValue() > -1 && param.getDimensionTwoValue() > -1){ 
tables = new ArrayList<String>(1); 
param.setDimensionOneTable(param.getDimensionOneValue() % UserDimension.MODEL_ONE); 
param.setDimensionTwoTable(param.getDimensionTwoValue() % UserDimension.MODEL_TWO); 
tables.add(UserDimension.MAIN_TABLE + UserDimension.UNDERLINE + param.getDimensionOneTable() + UserDimension.UNDERLINE + param.getDimensionTwoTable()); 
return tables; 
} 

//暂时不支持其他模式 
return tables; 
} 

}

java 手动分表（100张表）

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