mybatisplus3.5.3版本，数据权限如何使用

1、添加依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.liubaihui</groupId>
    <artifactId>datapress-test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>datapress-test</name>
    <description>datapress-test</description>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.0.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <java.version>17</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>3.0.2</spring-boot.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.3</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.5.3</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.30</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>3.0.2</version>
            </plugin>
        </plugins>
    </build>

</project>

2、添加拦截器

package com.liubaihui.datapresstest.configure;

import com.baomidou.mybatisplus.core.plugins.InterceptorIgnoreHelper;
import com.baomidou.mybatisplus.core.toolkit.PluginUtils;
import com.baomidou.mybatisplus.extension.parser.JsqlParserSupport;
import com.baomidou.mybatisplus.extension.plugins.handler.MultiDataPermissionHandler;
import com.baomidou.mybatisplus.extension.plugins.inner.DataPermissionInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.InnerInterceptor;
import lombok.*;
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.schema.Table;
import net.sf.jsqlparser.statement.select.PlainSelect;
import net.sf.jsqlparser.statement.select.Select;
import net.sf.jsqlparser.statement.select.SelectBody;
import net.sf.jsqlparser.statement.select.SetOperationList;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.sql.SQLException;
import java.util.List;

@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString(callSuper = true)
@EqualsAndHashCode(callSuper = true)
@Component
public class MyDataPermissionInterceptor extends DataPermissionInterceptor {
    @Autowired
    private MyDataPermissionHandler myDataPermissionHandler=new MyDataPermissionHandler();


    @Override
    public Expression buildTableExpression(Table table, Expression where, String whereSegment) {
        return myDataPermissionHandler.getSqlSegment(table, where, whereSegment);
    }
}

3、添加处理器

package com.liubaihui.datapresstest.configure;

import com.baomidou.mybatisplus.extension.plugins.handler.DataPermissionHandler;
import com.baomidou.mybatisplus.extension.plugins.handler.MultiDataPermissionHandler;
import com.baomidou.mybatisplus.generator.jdbc.DatabaseMetaDataWrapper;
import net.sf.jsqlparser.expression.Alias;
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.expression.HexValue;
import net.sf.jsqlparser.expression.StringValue;
import net.sf.jsqlparser.expression.operators.conditional.AndExpression;
import net.sf.jsqlparser.expression.operators.relational.EqualsTo;
import net.sf.jsqlparser.expression.operators.relational.ExpressionList;
import net.sf.jsqlparser.expression.operators.relational.InExpression;
import net.sf.jsqlparser.expression.operators.relational.ItemsList;
import net.sf.jsqlparser.schema.Column;
import net.sf.jsqlparser.schema.Table;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * 参考：https://baijiahao.baidu.com/s?id=1773281250190331633&wfr=spider&for=pc
 * @author: liubh
 * @since: 2023/10/15
 */
@Component
public class MyDataPermissionHandler implements MultiDataPermissionHandler {


    @Override
    public Expression getSqlSegment(Table table, Expression where, String mappedStatementId) {
        if (where == null) {
            where = new HexValue(" 1 = 1 ");
        }


        //获取mapper名称
        String className = mappedStatementId.substring(0, mappedStatementId.lastIndexOf("."));
        //获取方法名
        String methodName = mappedStatementId.substring(mappedStatementId.lastIndexOf(".") + 1);
//     String fromItem = table.getName();
//        // 有别名用别名，无别名用表名，防止字段冲突报错
//        Alias fromItemAlias = fromItem.getAlias();
//        String mainTableName = fromItemAlias == null ? fromItem.getName() : fromItemAlias.getName();
        //获取当前mapper 的方法
        Method[] methods = new Method[0];
        try {
            methods = Class.forName(className).getMethods();
        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }
        //遍历判断mapper 的所以方法，判断方法上是否有 UserDataPermission
        for (Method m : methods) {
            if (Objects.equals(m.getName(), methodName)) {
                EqualsTo usesEqualsTo = new EqualsTo();

                usesEqualsTo.setLeftExpression( new Column(table.getName() + ".company_id"));
                usesEqualsTo.setRightExpression(new StringValue("1"));
                return new AndExpression(where, usesEqualsTo);

            }

        }
        //说明无权查看，
        where = new HexValue(" 1 = 2 ");
        return where;
    }
}

4、设置拦截器

    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        // 添加数据权限插件
        MyDataPermissionInterceptor dataPermissionInterceptor = new MyDataPermissionInterceptor();
        // 添加自定义的数据权限处理器
        dataPermissionInterceptor.setDataPermissionHandler(new MyDataPermissionHandler());
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));//如果配置多个插件,切记分页最后添加
        interceptor.addInnerInterceptor(dataPermissionInterceptor);
        return interceptor;
    }