Excel生成Sql工具.java
今天分享一个使用excel表格一键生成建表语句sql工具
1.前置所需依赖
cn.hutool
hutool-all
5.1.0
org.apache.poi
poi-ooxml
4.1.2
org.projectlombok
lombok
provided
2.新建Excel文件并设计表结构
ps：字段属性值 0为非空 1为主键
3.新建工具类
package com.ruoyi.generator.util;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONObject;
import cn.hutool.poi.excel.WorkbookUtil;
import lombok.Data;
import org.apache.poi.ss.usermodel.*;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.*;
/**
* Excel生成Sql工具
* @author jokerpan
*/
public class GenerateSqlUtil {
@Data
public static class ExcelEntity{
/**
* 字段名
*/
private String filedName;
/**
* 字段类型
*/
private String filedType;
/**
* 字段注释
*/
private String notes;
/**
* 默认值
*/
private String defaultValue;
/**
* 字段属性
*/
private String attribute;
/**
* 字段索引
*/
private String index;
}
//输出目录
private static String outputPath = "D:/downloads/";
/**
* 生成sql文件
* @param filePath excel文件路径
*/
private static void generateSql(String filePath) throws IOException{
List> result = readExcel(filePath);
System.out.println("================================开始生成SQL，共"+result.size()+"张表================================");
StringBuilder sb = new StringBuilder();
StringBuilder indexSb = null;
for (Map map : result) {
JSONObject json = new JSONObject(true);// 有序
List list = (List) map.get("list");
String tableName = (String) map.get("tableName"); //表名
String tableNotes = (String) map.get("tableNotes"); //注释
sb.append(String.format("-- %s：%s\n", tableName, tableNotes));
sb.append(String.format("DROP TABLE IF EXISTS %s;\n", tableName));
sb.append(String.format("CREATE TABLE %s (\n", tableName));
int size = list.size();
indexSb = new StringBuilder();
for (int i = 0; i < size; i++) {
ExcelEntity entity = list.get(i);
if(entity.getFiledName() == null){
char c = sb.charAt(sb.length() - 2);
if(c == ','){
sb.deleteCharAt(sb.length() - 2);
}
continue;
}
sb.append(String.format("\t`%s` %s", entity.getFiledName(), entity.getFiledType()));
String type = entity.getFiledType();
String attribute = entity.getAttribute();
attribute = attribute == null ? "" : attribute;
if (attribute.contains("1")){
sb.append(" PRIMARY KEY AUTO_INCREMENT"); //设置主键
}else if (type.contains("char") || type.contains("text")){
sb.append(" CHARACTER SET utf8 COLLATE utf8_general_ci"); //字符串、文本设置编码
}
if (attribute.contains("0")){
sb.append(" NOT NULL");
}else{
sb.append(" NULL");
}
// 设置默认值
if (StrUtil.isNotBlank(entity.getDefaultValue())) {
sb.append(" DEFAULT ");
if (type.contains("char") || type.contains("text")){
sb.append(String.format("'%s'", entity.getDefaultValue()));
}else{
sb.append(entity.getDefaultValue());
}
}
sb.append(String.format(" COMMENT '%s'", entity.getNotes()));//设置注释
if (StrUtil.isNotBlank(entity.getIndex())) { //设置索引
//INDEX `index_name`(`field1`, `field2`) USING BTREE
indexSb.append("\tINDEX `");
String[] index = entity.getIndex().split(":");
indexSb.append(index[0]);
indexSb.append("`(`");
indexSb.append(index[1]);
indexSb.append("`)");
indexSb.append(" USING BTREE,\n");
}
if (i < size - 1 || indexSb.length() > 0) sb.append(",");
sb.append("\n");
json.putOpt(entity.getFiledName(),entity.getNotes());
}
if (indexSb.length() > 0) {
sb.append(indexSb.substring(0, indexSb.lastIndexOf(",")));
sb.append("\n");
}
sb.append(String.format(") ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '%s' ROW_FORMAT = Dynamic;", tableNotes));
sb.append("\n\n");
System.out.println(tableNotes+"："+json.toString());
}
File file = new File(outputPath);
FileOutputStream fos1 = new FileOutputStream(file);
OutputStreamWriter dos1 = new OutputStreamWriter(fos1);
dos1.write(sb.toString());
dos1.close();
System.out.println("================================SQL生成完成================================");
System.out.println("生成文件路径为：" + outputPath);
System.exit(0);
}
/**
* 根据文件路径解析文件
* @param filePath 文件路径
*/
private static List> readExcel(String filePath) {
List> result = new ArrayList<>();
File file = new File(filePath);
System.out.println("¥¥¥¥¥¥¥¥ 读取文件名：" + file.getName() + " ¥¥¥¥¥¥¥¥");
outputPath = outputPath + file.getName().substring(0, file.getName().lastIndexOf(".")) + ".sql";
Workbook book = WorkbookUtil.createBook(file);
int sheetNum = book.getNumberOfSheets();
for (int i = 0; i < sheetNum; i++) {
Map stringObjectMap = readExcel(book.getSheetAt(i));
if(stringObjectMap.size() > 0){
result.add(stringObjectMap);
}
}
return result;
}
/**
* 读取指定sheet的数据，获取表名，字段名、字段类型、字段注释
*/
private static Map readExcel(Sheet sheet) {
Map map = new HashMap<>();
List list = new ArrayList<>();
//第一行是标题，默认是注释:表名
Row titleRow = sheet.getRow(0);
if(titleRow != null){
String title = titleRow.getCell(2).toString();
map.put("tableName", title.split("：")[1]);
map.put("tableNotes", title.split("：")[0]);
//第二行是表头，不读取。第三行开始才是数据
int lastRowNum = sheet.getLastRowNum();
for (int i = 2; i <= lastRowNum; i++) {
list.add(getEntity(sheet.getRow(i)));
}
map.put("list", list);
}
return map;
}
private static ExcelEntity getEntity(Row row) {
ExcelEntity entity = new ExcelEntity();
//列数：5列，分别是字段名、字段类型、字段注释、字段属性、字段索引
for (int j = 0; j < 5; j++) {
Cell cell = row.getCell(j);
if(cell == null){
continue;
}
cell.setCellType(CellType.STRING);
if (!Objects.isNull(cell)) {
String str = cell.toString();
if (StrUtil.isNotBlank(str)) {
switch (j) {
case 0: entity.setFiledName(str); break;
case 1:
// if (str.contains("char")) {
// str = str + "(255)";
// }
if(str.equals("float")){
str = "float(17,6)";
}
entity.setFiledType(str);
break;
case 2: entity.setNotes(str); break;
case 3: entity.setAttribute(str); break;
case 4: entity.setDefaultValue(str); break;
case 5: entity.setIndex(str); break;
}
}
}
}
return entity;
}
public static void main(String[] args) throws IOException{
//传入excel路径
generateSql("D:/demo.xlsx");
}
}
4.在工具类中设置好excel读取路径和输出路径后直接运行main
运行效果如下：
