mybatis-plus动态表名

package com.ruoyi.framework.config;

import com.baomidou.mybatisplus.core.plugins.InterceptorIgnoreHelper;
import com.baomidou.mybatisplus.core.toolkit.PluginUtils;
import com.baomidou.mybatisplus.core.toolkit.TableNameParser;
import com.baomidou.mybatisplus.extension.plugins.handler.TableNameHandler;
import com.baomidou.mybatisplus.extension.plugins.inner.InnerInterceptor;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Data
@NoArgsConstructor
@AllArgsConstructor
@SuppressWarnings({"rawtypes"})
public class DynamicTableNameInnerInterceptor implements InnerInterceptor {

    private Map<String, TableNameHandler> tableNameHandlerMap;

    @Override
    public void beforeQuery(Executor executor, MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) throws SQLException {
        PluginUtils.MPBoundSql mpBs = PluginUtils.mpBoundSql(boundSql);
        if (InterceptorIgnoreHelper.willIgnoreDynamicTableName(ms.getId())) return;
        mpBs.sql(this.changeTable(mpBs.sql()));
    }

    @Override
    public void beforePrepare(StatementHandler sh, Connection connection, Integer transactionTimeout) {
        PluginUtils.MPStatementHandler mpSh = PluginUtils.mpStatementHandler(sh);
        MappedStatement ms = mpSh.mappedStatement();
        SqlCommandType sct = ms.getSqlCommandType();
        if (sct == SqlCommandType.INSERT || sct == SqlCommandType.UPDATE || sct == SqlCommandType.DELETE) {
            if (InterceptorIgnoreHelper.willIgnoreDynamicTableName(ms.getId())) return;
            PluginUtils.MPBoundSql mpBs = mpSh.mPBoundSql();
            mpBs.sql(this.changeTable(mpBs.sql()));
        }
    }

    protected String changeTable(String sql) {
        TableNameParser parser = new TableNameParser(sql);
        List<TableNameParser.SqlToken> names = new ArrayList<>();
        parser.accept(names::add);
        StringBuilder builder = new StringBuilder();
        int last = 0;
        for (TableNameParser.SqlToken name : names) {
            int start = name.getStart();
            if (start != last) {
                builder.append(sql, last, start);
                String value = name.getValue();
                TableNameHandler handler = tableNameHandlerMap.get(value);
                if (handler != null) {
                    builder.append(handler.dynamicTableName(sql, value));
                } else {
                    builder.append(value);
                }
            }
            last = name.getEnd();
        }
        if (last != sql.length()) {
            builder.append(sql.substring(last));
        }
        return builder.toString();
    }
}

package com.ruoyi.framework.config;

import cn.hutool.core.lang.Console;
import com.baomidou.mybatisplus.extension.plugins.handler.TableNameHandler;

public class MyTableNameHandler implements TableNameHandler {
    /**
     * @param sql       原始SQL
     * @param tableName 表名
     * @return 动态表名
     */
    @Override
    public String dynamicTableName(String sql, String tableName) {
        Console.log("sql:{}",sql);
        // 模拟获取月份参数，实际应该从参数中获取
        String[] month = {"epay"};
        // 随机获取
        String dynamicTableName = month[0] + "." + tableName ;
        System.err.println("动态查询表：" + dynamicTableName);
        return dynamicTableName;
    }
}

@Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        // 多租户插件
        interceptor.addInnerInterceptor(tenantLineInnerInterceptor());
        // 如果用了分页插件注意先 add TenantLineInnerInterceptor 再 add
        // PaginationInnerInterceptor
        // 用了分页插件必须设置 MybatisConfiguration#useDeprecatedExecutor = false
        // 分页插件
        // interceptor.addInnerInterceptor(paginationInnerInterceptor());

        // 添加动态表名插件
        DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();
        TableNameHandler tableNameHandler = new MyTableNameHandler();
        Map<String, TableNameHandler> tableNameHandlerMap = new HashMap<>();
        tableNameHandlerMap.put("sys_user", tableNameHandler); // sys_user 表配置动态表名插件
        dynamicTableNameInnerInterceptor.setTableNameHandlerMap(tableNameHandlerMap);
        interceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);

        // 乐观锁插件
        interceptor.addInnerInterceptor(optimisticLockerInnerInterceptor());
        // 阻断插件
        interceptor.addInnerInterceptor(blockAttackInnerInterceptor());
        return interceptor;
    }