How to solve the problem of column 'tenant' using the multi tenant plug-in provided by mybatis plus_ The problem of ID 'specified twist

Linyb road to Geek 2021-01-21 14:50:07
solve problem column tenant using


Preface

This case comes from the case of multi tenant development in business development department . Used to mybatis-plus Friends of multi tenant plug-ins , May know , The tenant of the plug-in id Values are basically derived from context , This context can be cookie、session、threadlocal etc. . According to the feedback from the business department , At some insertion , They found that there were no tenants available id value , So they did this at the level of their code , At the time of preservation , Set up tenants id. When it's saved , It's very successful Column 'tenant_id' specified twice

Source of problem

stay mybatis-plus 3.4 Before the release ,mybatis-plus When multi tenant insertion is performed, the existing tenant_id Filtering , This leads to Column 'tenant_id' specified twice problem . Its 3.4 Before the release, multi tenant sql Parser processing insert The source code of the statement is as follows

 @Override
public void processInsert(Insert insert) {
if (tenantHandler.doTableFilter(insert.getTable().getName())) {
// Filter exit execution
return;
}
insert.getColumns().add(new Column(tenantHandler.getTenantIdColumn()));
if (insert.getSelect() != null) {
processPlainSelect((PlainSelect) insert.getSelect().getSelectBody(), true);
} else if (insert.getItemsList() != null) {
// fixed github pull/295
ItemsList itemsList = insert.getItemsList();
if (itemsList instanceof MultiExpressionList) {
((MultiExpressionList) itemsList).getExprList().forEach(el -> el.getExpressions().add(tenantHandler.getTenantId(false)));
} else {
((ExpressionList) insert.getItemsList()).getExpressions().add(tenantHandler.getTenantId(false));
}
} else {
throw ExceptionUtils.mpe("Failed to process multiple-table update, please exclude the tableName or statementId");
}
}

Problem solution

1、 Scheme 1 : When the business code is inserted , Entities don't set up tenants id value , It is set by the multi tenant plug-in

2、 Option two : upgrade mybatis-plus Version is 3.4.1 Or later

However, the multi tenant plug-in should not be written in the same way as before , Although it was written before 3.4.1 Also compatible , But the authorities have already called @Deprecated mark , It means that the official does not recommend the previous way of writing , So we use the latest official tenant plug-in interceptor . The sample code is as follows

 /**
* New multi tenant plug-in configuration , One is to ease and the other to follow mybatis The rules of , Need to set up MybatisConfiguration#useDeprecatedExecutor = false Avoid caching in case of problems
*/
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
interceptor.addInnerInterceptor(new TenantLineInnerInterceptor(new TenantLineHandler() {
@Override
public Expression getTenantId() {
return new LongValue(1);
}
// This is a default Method , Default return false Indicates that all tables need to spell multi tenant conditions
@Override
public boolean ignoreTable(String tableName) {
return !"user".equalsIgnoreCase(tableName);
}
}));
// If you use the paging plug-in, pay attention to add TenantLineInnerInterceptor Again add PaginationInnerInterceptor
// The paging plug-in must be set up MybatisConfiguration#useDeprecatedExecutor = false
// interceptor.addInnerInterceptor(new PaginationInnerInterceptor());
return interceptor;
}
@Bean
public ConfigurationCustomizer configurationCustomizer() {
return configuration -> configuration.setUseDeprecatedExecutor(false);
}

TenantLineInnerInterceptor The bag of this interceptor is in com.baomidou.mybatisplus.extension.plugins.inner Under this bag

3、 Option three : If using mybatis-plus3.4.1 Previous version , You can customize a TenantSqlParser Resolver and rewrite processInsert Method , The core code is as follows
 */
@Override
public void processInsert(Insert insert) {
if (getTenantHandler().doTableFilter(insert.getTable().getName())) {
// Filter exit execution
return;
}
if (isAleadyExistTenantColumn(insert)) {
return;
}
insert.getColumns().add(new Column(getTenantHandler().getTenantIdColumn()));
if (insert.getSelect() != null) {
processPlainSelect((PlainSelect) insert.getSelect().getSelectBody(), true);
} else if (insert.getItemsList() != null) {
// fixed github pull/295
ItemsList itemsList = insert.getItemsList();
if (itemsList instanceof MultiExpressionList) {
((MultiExpressionList) itemsList).getExprList().forEach(el -> el.getExpressions().add(getTenantHandler().getTenantId()));
} else {
((ExpressionList) insert.getItemsList()).getExpressions().add(getTenantHandler().getTenantId());
}
} else {
throw ExceptionUtils.mpe("Failed to process multiple-table update, please exclude the tableName or statementId");
}
}
/**
* Judge whether there are tenants id Column fields
* @param insert
* @return If it already exists , Then bypass and do not execute
*/
private boolean isAleadyExistTenantColumn(Insert insert) {
List<Column> columns = insert.getColumns();
if(CollectionUtils.isEmpty(columns)){
return false;
}
String tenantIdColumn = getTenantHandler().getTenantIdColumn();
return columns.stream().map(Column::getColumnName).anyMatch(tenantId -> tenantId.equals(tenantIdColumn));
}

summary

How to choose the above three options ? If it's in the early stages of the project , Scheme 1 is recommended , Just don't set up tenants directly at the business level id, Unified processing by tenant plug-ins . If it's a brand new project ,mybatis-plus The latest version is recommended . If the project has already set up tenants in multiple places at the business level id And mybatis-plus The version is 3.4 The previous version , The third proposal is direct extension mybatis-plus The tenant plug-in function of , I don't recommend scheme one , Avoid omission

demo link

https://github.com/lyb-geek/springboot-learning/tree/master/springboot-mybatisplus-tenant

版权声明
本文为[Linyb road to Geek]所创,转载请带上原文链接,感谢
https://javamana.com/2021/01/20210121144943215H.html

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