Mysql導出表字段說明

package com.db;

import java.awt.Color;
import java.io.FileOutputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import com.lowagie.text.Cell;
import com.lowagie.text.Document;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Table;
import com.lowagie.text.rtf.RtfWriter2;

/**
 * 數據字典生成器 Mysql
 *
 * @author Eric zhou
 */
public class MySQL_DBDocer {
    //鍵類型字典
    private static Map<String, String> keyType = new HashMap<String, String>();

    //初始化jdbc
    static {
        try {
            keyType.put("PRI", "主鍵");
            keyType.put("UNI", "唯一鍵");
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    private static String url = "jdbc:mysql://39.xxx.xxx.xxx:3306/xxx?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&allowPublicKeyRetrieval=true&useSSL=false";//鏈接url
    private static String username = "root"; //用戶名
    private static String password = "Root123;"; //密碼
    private static String schema = "xxxx"; //目標數據庫名
    //查詢所有表的sql語句
    private static String sql_get_all_tables = "select table_name,TABLE_COMMENT from INFORMATION_SCHEMA.tables where TABLE_SCHEMA='" + schema + "' and TABLE_TYPE='BASE TABLE'";
    //查詢所有字段的sql語句
    private static String sql_get_all_columns = "select column_name,data_type,character_octet_length,COLUMN_COMMENT,is_nullable,COLUMN_key from information_schema.`COLUMNS` where TABLE_NAME='{table_name}' and TABLE_SCHEMA='" + schema + "'";

    public static void main(String[] args) throws Exception {
        //初始化word文檔
        Document document = new Document(PageSize.A4);
        RtfWriter2.getInstance(document, new FileOutputStream("E:/word1111.docx"));
        document.open();
        //查詢開始
        Connection conn = getConnection();
        //獲取所有表
        List tables = getDataBySQL(sql_get_all_tables, conn);
        int i = 1;
        for (Iterator iterator = tables.iterator(); iterator.hasNext(); ) {
            String[] arr = (String[]) iterator.next();
            //循環獲取字段信息
            System.out.print(i + ".正在處理數據表-----------" + arr[0]);
            addTableMetaData(document, arr, i);
            List columns = getDataBySQL(sql_get_all_columns.replace("{table_name}", arr[0]), conn);
            addTableDetail(document, columns);
            addBlank(document);
            System.out.println("...done");
            i++;
        }
        document.close();
        conn.close();
    }

    /**
     * 添加一個空行
     *
     * @param document
     * @throws Exception
     */
    public static void addBlank(Document document) throws Exception {
        Paragraph ph = new Paragraph("");
        ph.setAlignment(Paragraph.ALIGN_LEFT);
        document.add(ph);
    }

    /**
     * 添加包含字段詳細信息的表格
     *
     * @param document
     * @param
     * @param columns
     * @throws Exception
     */
    public static void addTableDetail(Document document, List columns) throws Exception {
        Table table = new Table(6);
        table.setWidth(100f);//表格 寬度100%
        table.setBorderWidth(1);
        table.setBorderColor(Color.BLACK);
        table.setPadding(0);
        table.setSpacing(0);
        Cell cell1 = new Cell("序號");// 單元格
        cell1.setHeader(true);

        Cell cell2 = new Cell("列名");// 單元格
        cell2.setHeader(true);

        Cell cell3 = new Cell("類型");// 單元格
        cell3.setHeader(true);

        Cell cell4 = new Cell("長度");// 單元格
        cell4.setHeader(true);

        Cell cell5 = new Cell("鍵");// 單元格
        cell5.setHeader(true);

        Cell cell6 = new Cell("說明");// 單元格
        cell6.setHeader(true);
        //設置表頭格式
        table.setWidths(new float[]{8f, 30f, 15f, 8f, 10f, 29f});
        cell1.setHorizontalAlignment(Cell.ALIGN_CENTER);
        cell1.setBackgroundColor(Color.gray);
        cell2.setHorizontalAlignment(Cell.ALIGN_CENTER);
        cell2.setBackgroundColor(Color.gray);
        cell3.setHorizontalAlignment(Cell.ALIGN_CENTER);
        cell3.setBackgroundColor(Color.gray);
        cell4.setHorizontalAlignment(Cell.ALIGN_CENTER);
        cell4.setBackgroundColor(Color.gray);
        cell5.setHorizontalAlignment(Cell.ALIGN_CENTER);
        cell5.setBackgroundColor(Color.gray);
        cell6.setHorizontalAlignment(Cell.ALIGN_CENTER);
        cell6.setBackgroundColor(Color.gray);
        table.addCell(cell1);
        table.addCell(cell2);
        table.addCell(cell3);
        table.addCell(cell4);
        table.addCell(cell5);
        table.addCell(cell6);
        table.endHeaders();// 表頭結束
        int x = 1;
        for (Iterator iterator = columns.iterator(); iterator.hasNext(); ) {
            String[] arr2 = (String[]) iterator.next();
            Cell c1 = new Cell(x + "");
            Cell c2 = new Cell(arr2[0]);
            Cell c3 = new Cell(arr2[1]);
            Cell c4 = new Cell(arr2[2]);

            String key = keyType.get(arr2[5]);
            if (key == null) key = "";
            Cell c5 = new Cell(key);
            Cell c6 = new Cell(arr2[3]);
            c1.setHorizontalAlignment(Cell.ALIGN_CENTER);
            c2.setHorizontalAlignment(Cell.ALIGN_CENTER);
            c3.setHorizontalAlignment(Cell.ALIGN_CENTER);
            c4.setHorizontalAlignment(Cell.ALIGN_CENTER);
            c5.setHorizontalAlignment(Cell.ALIGN_CENTER);
            c6.setHorizontalAlignment(Cell.ALIGN_CENTER);
            table.addCell(c1);
            table.addCell(c2);
            table.addCell(c3);
            table.addCell(c4);
            table.addCell(c5);
            table.addCell(c6);
            x++;
        }
        document.add(table);
    }

    /**
     * 增加表概要信息
     *
     * @param dcument
     * @param arr
     * @param i
     * @throws Exception
     */
    public static void addTableMetaData(Document dcument, String[] arr, int i) throws Exception {
        Paragraph ph = new Paragraph(i + ". 表名: " + arr[0] + "  說明: " + (arr[1] == null ? "" : arr[1]));
        ph.setAlignment(Paragraph.ALIGN_LEFT);
        dcument.add(ph);
    }

    /**
     * 把SQL語句查詢出列表
     *
     * @param sql
     * @param conn
     * @return
     */
    public static List getDataBySQL(String sql, Connection conn) {
        Statement stmt = null;
        ResultSet rs = null;
        List list = new ArrayList();
        try {
            stmt = conn.createStatement();
            rs = stmt.executeQuery(sql);
            while (rs.next()) {
                String[] arr = new String[rs.getMetaData().getColumnCount()];
                for (int i = 0; i < arr.length; i++) {
                    arr[i] = rs.getString(i + 1);
                }
                list.add(arr);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        return list;
    }

    /**
     * 獲取數據庫連接
     *
     * @return
     */
    public static Connection getConnection() {
        try {
            return DriverManager.getConnection(url, username, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
}