Jimsql: 纯Java的文本数据库实现

Posted 2023-02-04 麒思妙想

前面两篇文章介绍了如何自定义jdbc，以及实现解析，今天我们来介绍这个项目的主体JimSQL

What is Jim

JimSql = Jim Isn’t mysql. Jim is a filesystem database system implemention use Java.

Useage

use docker-compose to start a server

version: '3'
services:
  jimsql:
    privileged: true
    image: dafei1288/jimsql_server:1.0.0
    ports:
      - "8821:8821"
      - "8825:8825"
#     volumes:
#       - "./data:/jimsql/data"
    environment:
#      JAVA_OPTS: -agentlib:jdwp=transport=dt_socket,address=*:8825,server=y,suspend=n
      JAVA_ARGS: 8821 0.0.0.0 /jimsql/data

Use snapshot repository

  <repositories>
  <repository>
    <id>jim</id>
    <url>https://oss.sonatype.org/content/repositories/snapshots</url>
  </repository>
</repositories>

Then use jdbc to connect

<dependency>
  <groupId>com.dafei1288</groupId>
  <artifactId>jdbc</artifactId>
  <version>1.0.0-SNAPSHOT</version>
</dependency>

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

public class TestServer 

  public static void main(String[] args) throws Exception 
    
    Class.forName("com.dafei1288.jimsql.jdbc.JqDriver");
    Connection conn = DriverManager.getConnection("jdbc:jimsql://localhost:8821/test");
    System.out.println(conn);

    Statement statement = conn.createStatement();
    System.out.println(statement);
    String sql = "select id,name from user";
    ResultSet resultSet = statement.executeQuery(sql);
    System.out.println(sql);
    System.out.println(resultSet);
    while(resultSet.next())

      ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
      List<String> colNames = new ArrayList<>();
      for(int i=0;i<resultSetMetaData.getColumnCount();i++)
        String colName = resultSetMetaData.getColumnLabel(i);
        System.out.println(colName+" => "+resultSet.getString(colName));
      
      System.out.println();
    

  

仓库地址 https://github.com/dafei1288/jimsql 欢迎大家fork、star ， 目前只实现了简单查询，后续会继续添加 ddl，dml，dcl等特性