快速創建數據字典

package com.cjm.common;

import java.io.File;
import java.io.FileOutputStream;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

public class MetadataCreator {
 private Connection cn = null;
 private List fieldTypes = null;
 private List executedTables = null;
 private String[] types = {"TABLE", "VIEW"}; //只生成表和視圖的數據字典
 
 private String driver;
 private String url;
 private String uid;
 private String pwd;
 private String catalog;
 private String schema;
 
 public MetadataCreator()throws Exception{
  initData();
  
  //initSqlServerDBParams();
  initOracleDBParams();
  
     Class.forName(driver);
     this.cn = DriverManager.getConnection(url, uid, pwd);
 }
 
 private void initData(){
  //字符串類型
  fieldTypes = new ArrayList();
  fieldTypes.add("CHAR");
  fieldTypes.add("NCHAR");
  fieldTypes.add("VARCHAR");
  fieldTypes.add("NVARCHAR");
  fieldTypes.add("VARCHAR2");
  fieldTypes.add("NVARCHAR2");
  
  //排除以下表
  executedTables = new ArrayList();
  executedTables.add("dtproperties");
  executedTables.add("sysconstraints");
  executedTables.add("syssegments");
 }
 
 /**
  * SqlServer數據庫連接參數
  */
 private void initSqlServerDBParams(){
  catalog = "test"; //SqlServer的數據庫名
  schema = null;
  
  driver = "net.sourceforge.jtds.jdbc.Driver";
     url = "jdbc:jtds:sqlserver://localhost:1433;DatabaseName=test";
     uid = "test";
     pwd = "test";
 }
 
 /**
  * Oracle數據庫連接參數
  */
 private void initOracleDBParams(){
  catalog = null;
  schema = "QYCD"; //Oracle的用戶名
  
  driver = "oracle.jdbc.driver.OracleDriver";
     url = "jdbc:oracle:thin:@localhost:1521:ORCL";
     uid = "qycd";
     pwd = "qycd";
 }
 
 /**
  * 取得一個表的所有主鍵字段
  */
 private String getTablePrimaryKeys(String tableName){
  try{
   DatabaseMetaData dbmd = cn.getMetaData();
   ResultSet rs = dbmd.getPrimaryKeys(catalog, schema, tableName);
   StringBuffer sb = new StringBuffer(",");
   while(rs.next()){
    sb.append(rs.getString("COLUMN_NAME") + ",");
   }
   rs.close();
   
   return sb.toString();
  }catch(Exception ex){
   return "";
  }
 }
 
 /**
  * 生成數據字典
  */
 public void createTableMetadata(String fileName){
  try{
   if(fileName == null || fileName.length() == 0){
    throw new IllegalArgumentException("fileName is null");
   }
   
   File file = new File(fileName);
   
   //delete old file
   if(file.exists() && file.isFile()) file.delete();
   
   //create sheet
   WritableWorkbook book = Workbook.createWorkbook(new FileOutputStream(file));
   WritableSheet sheet = book.createSheet("數據字典",0);
   
   DatabaseMetaData dbmd = cn.getMetaData();
   ResultSet rs = dbmd.getTables(catalog ,schema, null, types);
   int rowIndex = 0;
   int tableCount = 0;
   while(rs.next()){
    try{
     String tableName = rs.getString("TABLE_NAME");
     
     //排除表
     if(executedTables.contains(tableName.toLowerCase())) continue;

     tableCount++;
     System.out.println(tableCount + "、" + tableName + " doing...");
     
     //表名
     sheet.mergeCells(0, rowIndex, 6, rowIndex);  //合併單元格，5數字要與表頭的cell個數一致
     sheet.addCell(new Label(0, rowIndex, tableCount + "、" + tableName));
     rowIndex++;
     
     //表頭
     sheet.addCell(new Label(0,rowIndex,"序號"));
     sheet.addCell(new Label(1,rowIndex,"字段名"));
     sheet.addCell(new Label(2,rowIndex,"中文名稱"));
     sheet.addCell(new Label(3,rowIndex,"字段類型"));
     sheet.addCell(new Label(4,rowIndex,"是否可空"));
     sheet.addCell(new Label(5,rowIndex,"主鍵"));
     sheet.addCell(new Label(6,rowIndex,"字段說明"));
     rowIndex++;
     
     //主鍵
     String strPrimaryKeys = getTablePrimaryKeys(tableName);
     
     Statement stm = cn.createStatement();
     stm.setMaxRows(1);
     ResultSet rsColumn = stm.executeQuery("select * from " + tableName);
     ResultSetMetaData rsmd = rsColumn.getMetaData();
     int recordIndex = 1;
     for(int i=1;i<=rsmd.getColumnCount();i++){
      sheet.addCell(new Label(0,rowIndex,String.valueOf(recordIndex)));
      sheet.addCell(new Label(1,rowIndex,rsmd.getColumnName(i)));
      sheet.addCell(new Label(2,rowIndex,""));
      
      //字段類型
      String fieldType = rsmd.getColumnTypeName(i);
      if(fieldTypes.contains(fieldType.toUpperCase())){
       fieldType += "(" + rsmd.getColumnDisplaySize(i) + ")";
      }else{
       if(rsmd.getPrecision(i) > 0){
        //精度
        fieldType += "(" + rsmd.getPrecision(i) + "," + rsmd.getScale(i) + ")";
       }
      }
      sheet.addCell(new Label(3,rowIndex,fieldType));      
      
      //是否可爲null
      sheet.addCell(new Label(4,rowIndex,(rsmd.isNullable(i)==1)?"":"N"));
      
      //是否是主鍵字段
      if(strPrimaryKeys.indexOf("," + rsmd.getColumnName(i) + ",") != -1){
       sheet.addCell(new Label(5,rowIndex,"Y"));
      }else{
       sheet.addCell(new Label(5,rowIndex,""));
      }
      
      //字段說明
      sheet.addCell(new Label(6,rowIndex,""));
      
      rowIndex++;
      recordIndex++;
     }
     rowIndex += 2;
     
     rsColumn.close();
     stm.close();
    }catch(Exception e){
     e.printStackTrace();
    }
   }
   rs.close();
   
   System.out.println("DONE");
   
   book.write();
   book.close();
  }catch(Exception ex){
   ex.printStackTrace();
  }finally{
   try{
    if(cn != null) cn.close();
   }catch(Exception e){
    e.printStackTrace();
   }
  }
 }
 
 public static void main(String[] args) {
  try{
   MetadataCreator md = new MetadataCreator();
   md.createTableMetadata("c://md.xls");
  }catch(Exception ex){
   ex.printStackTrace();
  }
 }
 
}