package com.example.demo;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import javax.swing.filechooser.FileSystemView;

public class GenEntityTable {

private static final String driver="com.mysql.jdbc.Driver";
private static final String pwd="root";
private static final String user="root";
private static final String url = "jdbc:mysql://127.0.0.1:3306/test" + "?user=" + user + "&password=" + pwd + "&useUnicode=true&characterEncoding=UTF-8";

private static Connection getConnection=null;

public static void main(String[] args) {
    FileSystemView fsv=FileSystemView.getFileSystemView();
    getConnection=getConnections();
    try {
        DatabaseMetaData dbmd=getConnection.getMetaData();
        ResultSet resultSet = dbmd.getTables(null, "%", "%", new String[] { "TABLE" });
        while (resultSet.next()) {
            String tableName=resultSet.getString("TABLE_NAME");

            ResultSet rs2 = dbmd.getColumns(null, "%", tableName, "%");
            System.out.println("###"+tableName);
            System.out.println("| 列名 | 类型 | 注释 |");
            System.out.println("| ------ | ------ | ------ |");
            while(rs2.next()){
                String name = rs2.getString("COLUMN_NAME");
                String type = rs2.getString("TYPE_NAME");
                String op=rs2.getString("REMARKS");
                System.out.println("| "+name+" | "+type+" | "+op+" |");
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}
// 创建数据库连接
public static Connection getConnections() {
    try {
        Class.forName(driver);
        getConnection = DriverManager.getConnection(url, user, pwd);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return getConnection;
}


// 判断属性类型
public static String sqlType2JavaType(String sqlType) {
    String str = null;
    if (sqlType.equalsIgnoreCase("bit")) {
        str = "boolean";
    } else if (sqlType.equalsIgnoreCase("tinyint")) {
        str = "byte";
    } else if (sqlType.equalsIgnoreCase("smallint")) {
        str = "short";
    } else if (sqlType.equalsIgnoreCase("int")) {
        str = "int";
    } else if (sqlType.equalsIgnoreCase("bigint")) {
        str = "long";
    } else if (sqlType.equalsIgnoreCase("float")) {
        str = "float";
    } else if (sqlType.equalsIgnoreCase("decimal") || sqlType.equalsIgnoreCase("numeric")
            || sqlType.equalsIgnoreCase("real") || sqlType.equalsIgnoreCase("money")
            || sqlType.equalsIgnoreCase("smallmoney")) {
        str = "double";
    } else if (sqlType.equalsIgnoreCase("varchar") || sqlType.equalsIgnoreCase("char")
            || sqlType.equalsIgnoreCase("nvarchar") || sqlType.equalsIgnoreCase("nchar")
            || sqlType.equalsIgnoreCase("text")) {
        str = "String";
    } else if (sqlType.equalsIgnoreCase("datetime")) {
        str = "String";
    } else if (sqlType.equalsIgnoreCase("image")) {
        str = "Blod";
    }
    return str;
}

}