---

1、查询某张表字段信息

select column_name as columnName, -- 字段名
COLUMN_DEFAULT as colDefault,  -- 默认值
column_key as columnKey, -- PRI-主键，UNI-唯一键，MUL-外键column_comment as columnComment,  -- 字段中文名称column_type as columnType, -- 字段类型IS_NULLABLE as isNullLable -- 是否允许为空from information_schema.columns where table_schema = (select database()) and table_name = ('sys_role_dept') order by ordinal_position

2、TableVo接收sql查询得到的数据

package com.dtt.web.domain.vo;
import lombok.Data;@Data
public class TableVo {public String columnName; // 字段名public String colDefault; // 默认值public String columnKey; // PRI-主键，UNI-唯一键，MUL-外键public String columnComment; // 字段中文名称public String columnType; // 字段类型public String isNullLable; // 是否为空  YES，NO
}

3、excel导出

注意：需要hutool依赖

@Test
public void exportTable(){String tableName = "ssa_store_info";SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");List<TableVo> sysRoleDept = demoMapper.getList(tableName);List<Map<String, Object>> rows = sysRoleDept.stream().map(a -> {Map<String, Object> row = new LinkedHashMap<>();String PRI = "N"; // 主键String MUL = "N"; // 外键String UNI = "N"; // 唯一String defaultStr = "N";String isNotNull = "N"; // 是否非空if (a.getIsNullLable().equals("NO")) isNotNull = "Y";if (Strings.isNotBlank(a.getColDefault())) defaultStr = a.getColDefault();String columnKey = a.getColumnKey();if (columnKey.equals("PRI")) {PRI = "Y";UNI = "Y";}if (columnKey.equals("MUL")) MUL = "Y";if (columnKey.equals("UNI")) UNI = "Y";row.put("字段中文名", a.getColumnComment());row.put("字段名", a.getColumnName());row.put("数据类型", a.getColumnType());row.put("主键", PRI);row.put("外键", MUL);row.put("唯一", UNI);row.put("非空", isNotNull);row.put("缺省", defaultStr);row.put("描述", a.getColumnComment());return row;}).collect(Collectors.toList());ExcelWriter writer = ExcelUtil.getWriter("e:/"+tableName+sdf.format(new Date())+".xlsx");// 微调一下每个列的宽度writer.setColumnWidth(0,16);writer.setColumnWidth(1,16);writer.setColumnWidth(2,16);writer.setColumnWidth(3,16);writer.setColumnWidth(4,16);writer.setColumnWidth(5,16);writer.setColumnWidth(6,16);writer.setColumnWidth(7,16);writer.setColumnWidth(8,16);//一次性写出内容，强制输出标题writer.write(rows, true);//关闭writer，释放内存writer.close();System.out.println();
}

4、导出案例