Yiwen teaches you to quickly generate MySQL database diagram

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Requirements describe ：

Demand analysis ：

Technical solution ：

Solution ：

summary

Requirements describe ：

In the old system of the company , There are many database tables , But at the beginning of the design, the relationship diagram was not established , As a result, the new recruits have just joined the company , face N Databases , Hundreds of tables per library , Very inconvenient .

for example ： There are 300 tables in a system of the company , Not familiar with the project , Open the database and see a column of tables , Very unclear , Very unfriendly to new colleagues .

Demand analysis ：

We have a system , There may be many modules , For example, there are commodity modules in the mall system 、 Coupon module 、 Store module, etc , Every module has dozens of tables , Each module needs to generate the following diagram ：（ Make complaints about it ,Navicat The reverse diagram is not PowerDesigner good-looking ）

Technical solution ：

Using tools ：Navicat

        Navicat Is a domestic database client , Built in model function , Can be realized in the requirements , Select all tables of a module , Reverse table to model , To generate ER chart , But if you select , No foreign key associations , The generated model , Not as in the requirements , There is an intuitive line connection , So you need to generate foreign keys for the corresponding tables SQL.

        from Navicat Select all tables to export as SQL I found the following pattern

Solution ：

1. Split each table statement

2. Main table and associated table , The main table does not need to produce foreign keys , A small apostrophe can be used to determine whether a foreign key is required for an association table

3. It is better to read the code once than to say more words

package com.example.demo;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.nio.file.Files;import java.nio.file.Paths;import java.util.ArrayList;import java.util.Arrays;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Set;import java.util.stream.Collectors;public class MysqlERGenerate { public static void main(String[] args) throws IOException { StringBuilder builder = new StringBuilder(); // Input from Navicat Exported table structure sql file Read the file out Put it in the string InputStream is = Files.newInputStream(Paths.get("C:\\Users\\admin\\Desktop\\ddl.sql")); String line; BufferedReader reader = new BufferedReader(new InputStreamReader(is)); line = reader.readLine(); while (line != null) { builder.append(line); builder.append("\n"); line = reader.readLine(); } reader.close(); is.close(); String sql = builder.toString(); // According to the law Use CREATE TABLE Segmentation And delete a file comment section String[] split = sql.split("CREATE TABLE"); List<String> list = new ArrayList<>(Arrays.asList(split)); list.remove(0); // Use the first two apostrophes to intercept Get the name of the watch To Map< Table name , SQL> Map<String, String> collect = list.stream().collect(Collectors.toMap(k -> { int firstIndex = k.indexOf("`"); return k.substring(++firstIndex, k.indexOf("`", firstIndex)); }, v -> v)); // You need to create foreign key fields and corresponding main table names Map< Foreign key name , Foreign key main table name > Map<String, String> foreignKey = new HashMap<>(); foreignKey.put("ticket_no", "ticket"); foreignKey.put("ticket_define_no", "ticket_define"); foreignKey.put("pro_no", "pro_main"); // Circular judgement , Generate foreign keys SQL Set<String> foreignKeyFields = foreignKey.keySet(); for (String mainTableName : collect.keySet()) { String val = collect.get(mainTableName); for (String field : foreignKeyFields) { if (!mainTableName.equals(foreignKey.get(field)) && val.indexOf("`" + field + "`") > 0) { String createForeignKeySql = String.format("alter table %s add foreign key %s(%s) references %s(%s);", mainTableName, mainTableName + field + System.currentTimeMillis(), field, foreignKey.get(field), field); System.out.println(createForeignKeySql); } } } }}

Running effect ： Only part of it is copied , It's actually far more than this

alter table pro_param add foreign key pro_parampro_no1650765563395(pro_no) references pro_main(pro_no);alter table pro_shop_priority_his_20200805 add foreign key pro_shop_priority_his_20200805pro_no1650765563423(pro_no) references pro_main(pro_no);alter table ticket_define_shop add foreign key ticket_define_shopticket_define_no1650765563423(ticket_define_no) references ticket_define(ticket_define_no);alter table ticket_define_item add foreign key ticket_define_itemticket_define_no1650765563425(ticket_define_no) references ticket_define(ticket_define_no);alter table ticket_his_2019 add foreign key ticket_his_2019ticket_no1650765563432(ticket_no) references ticket(ticket_no);alter table ticket_his_2018 add foreign key ticket_his_2018ticket_no1650765563433(ticket_no) references ticket(ticket_no);

Foreign key statements should not be developed, tested, or executed in the production environment , You should build a new database locally

When creating a new library , Just turn the structure , Otherwise, there are too many data , The execution of foreign key statements is very slow

After the end , Want diagrams between those tables , You only need to select and reverse the table to the model to get the effect in the requirements

If there's plenty of money , You can buy me a cup of coffee as a reward , thank you Thanks*(･ω･)ﾉ

summary

This is about rapid generation MySQL This is the end of the database diagram article , More related builds MySQL Please search the previous articles of SDN or continue to browse the related articles below. I hope you will support SDN more in the future ！