Hibernate生成实体类-手工写法(一)
BaseDao
package com.pb.dao; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; public class BaseDao { protected Connection conn; protected PreparedStatement ps; protected ResultSet rs; public Connection getConnection() { String driver = "oracle.jdbc.driver.OracleDriver"; String url = "jdbc:oracle:thin:@localhost:1521:orcl"; String username = "accp"; String password = "accp"; try { Class.forName(driver); conn = DriverManager.getConnection(url, username, password); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } return conn; } public void closeConnection() { if (rs != null) { try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } } if (ps != null) { try { ps.close(); } catch (SQLException e) { e.printStackTrace(); } } if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } public ResultSet executeQuery(String sql,Object [] params){ getConnection(); try { ps=conn.prepareStatement(sql); if(params!=null){ for (int i = 0; i < params.length; i++) { ps.setObject(i+1, params[i]); } } rs=ps.executeQuery(); } catch (SQLException e) { e.printStackTrace(); } return rs; } public int executeUpdate(String sql,Object [] params){ int updateNum=-1; getConnection(); try { ps=conn.prepareStatement(sql); if(params!=null){ for (int i = 0; i < params.length; i++) { ps.setObject(i+1, params[i]); } } updateNum=ps.executeUpdate(); } catch (SQLException e) { e.printStackTrace(); }finally{ this.closeConnection(); } return updateNum; } }
tableDao仍然是Dao层
package com.pb.dao; import java.util.List; import java.util.Map; public interface TableDao { public List<String> getTableName(); public Map<String, String> getCols(String tableName); }
tableDaoImpl实现数据访问
package com.pb.dao.impl; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import com.pb.dao.BaseDao; import com.pb.dao.TableDao; public class TableDaoImpl extends BaseDao implements TableDao { //当前用户下的所有表名 @Override public List<String> getTableName() { List<String> tableNameList = null; try { String sql = "select * from user_tables"; Object[] params = {}; ResultSet rs = super.executeQuery(sql, params); if (rs != null) { tableNameList = new ArrayList<String>(); while (rs.next()) { tableNameList.add(rs.getString("TABLE_NAME")); } } } catch (SQLException e) { e.printStackTrace(); } finally { super.closeConnection(); } return tableNameList; } //指定表名的所有字段 @Override public Map<String, String> getCols(String tableName) { Map<String, String> map=null; try { String sql="select * from user_tab_cols where table_name=?"; Object [] params={tableName}; ResultSet rs=super.executeQuery(sql, params); if(rs!=null){ map=new HashMap<String, String>(); while(rs.next()){ map.put(rs.getString("COLUMN_NAME"), rs.getString("DATA_TYPE")); } } } catch (SQLException e) { e.printStackTrace(); } finally { super.closeConnection(); } return map; } }
业务层biz
TableService接口
package com.pb.biz; import java.util.List; import java.util.Map; public interface TableService { public List<String> getTableName(); public Map<String, String> getCols(String tableName); }
TableService接口业务层实现
package com.pb.biz.impl; import java.util.List; import java.util.Map; import com.pb.biz.TableService; import com.pb.dao.TableDao; import com.pb.dao.impl.TableDaoImpl; public class TableServiceImpl implements TableService { private TableDao tableDao=new TableDaoImpl(); @Override public List<String> getTableName() { return tableDao.getTableName(); } @Override public Map<String, String> getCols(String tableName) { return tableDao.getCols(tableName); } }
测试类
package com.pb.test; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.List; import java.util.Map; import java.util.Scanner; import com.pb.biz.TableService; import com.pb.biz.impl.TableServiceImpl; public class DemoTest { public static TableService tableService=new TableServiceImpl(); public static Scanner input=new Scanner(System.in); public static void main(String[] args) { Map<String, String> map; //类名 String className=null; //获取accp用户下的全部表名 List<String> tableNameList=getTableName(); System.out.println("请输入你需要的表名"); String tableName=input.next().toUpperCase(); boolean flag=false; for (String s : tableNameList) { if(s.contains(tableName)){ flag=true; } } if(flag==true){ System.out.println("表已经找到表名为"+tableName); //输出表名并生成类名 className ="public class " + tableName.substring(0,1)+tableName.substring(1).toLowerCase()+" { \n"; //要建立的包名 System.out.println("请输入要建立的包名:"); String pack="package "+input.next()+" ;\n"; //获取表中的字段 map =tableService.getCols(tableName); //根据表名生成文件名 String filename=tableName.substring(0,1)+tableName.substring(1).toLowerCase()+".java"; //找到表中的字段 map=getTableCols(tableName); //建立属性字符串 String proerty=getProerty(map); //无参数构造方法 String con=getconString(tableName); //get方法 String getter=getMethod(map); //setter方法 String setter=setMethod(map); //生成总字符串 String str=pack+className+proerty+con+getter+setter+"}"; //写入文件 File file=new File("d:"+File.separator+filename); FileOutputStream fos=null; try { fos=new FileOutputStream(file); fos.write(str.getBytes()); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }finally{ try { fos.close(); } catch (IOException e) { e.printStackTrace(); } } }else{ System.out.println("没有这个表"+tableName); } } //当前用户下所有表名 public static List<String> getTableName(){ return tableService.getTableName(); } //字段 public static Map<String,String> getTableCols(String tableName){ return tableService.getCols(tableName); } //无参数构造方法 public static String getconString(String tableName){ String conString=" \n // 无参数构造方法\n public "+tableName.substring(0,1)+tableName.substring(1).toLowerCase()+"(){\n\n}\n"; return conString; } //将字段转为字符串属性 public static String getProerty(Map<String,String> map){ String str="// Fields \n"; for(String s:map.keySet()){ if(map.get(s).equals("NUMBER")){ str+=" \n private " +"int "+s.toLowerCase()+";\n"; }else if(map.get(s).equals("VARCHAR2")){ str+=" \n private " +"String "+s.toLowerCase()+";\n"; }else if(map.get(s).equals("DATE")){ str+=" \n private " +"Date "+s.toLowerCase()+";\n"; }else{ str+=" \n private " +map.get(s)+" "+s.toLowerCase()+";\n"; } } return str; } //get方法 //将字段转为get方法 public static String getMethod(Map<String,String> map){ String str="//getter方法\n"; for(String s:map.keySet()){ if(map.get(s).equals("NUMBER")){ str+=" \n public " +"int "+"get"+s.substring(0,1)+s.substring(1).toLowerCase()+"(){\n return this."+s.toLowerCase()+"; \n}"; }else if(map.get(s).equals("VARCHAR2")){ str+=" \n public " +"String "+"get"+s.substring(0,1)+s.substring(1).toLowerCase()+"(){\n return this."+s.toLowerCase()+"; \n}"; }else if(map.get(s).equals("DATE")){ str+=" \n public " +"Date "+"get"+s.substring(0,1)+s.substring(1).toLowerCase()+"(){\n return this."+s.toLowerCase()+"; \n}"; }else{ str+=" \n public " +map.get(s)+" "+"get"+s.substring(0,1)+s.substring(1).toLowerCase()+"(){\n return this."+s.toLowerCase()+"; \n}"; } } return str; } //set方法 //将字段转为set方法 public static String setMethod(Map<String,String> map){ String str="\n//setter方法\n"; for(String s:map.keySet()){ if(map.get(s).equals("NUMBER")){ str+=" \n public void " +"set"+s.substring(0,1)+s.substring(1).toLowerCase()+"("+"int "+s.toLowerCase()+") {\n this."+s.toLowerCase()+"="+s.toLowerCase()+";\n}\n"; }else if(map.get(s).equals("VARCHAR2")){ str+=" \n public void " +"set"+s.substring(0,1)+s.substring(1).toLowerCase()+"("+"String "+s.toLowerCase()+") {\n this."+s.toLowerCase()+"="+s.toLowerCase()+";\n}\n"; }else if(map.get(s).equals("DATE")){ str+=" \n public void " +"set"+s.substring(0,1)+s.substring(1).toLowerCase()+"("+"Date "+s.toLowerCase()+") {\n this."+s.toLowerCase()+"="+s.toLowerCase()+";\n}\n"; }else{ str+=" \n public void " +" "+"set"+s.substring(0,1)+s.substring(1).toLowerCase()+"("+map.get(s)+" "+s.toLowerCase()+") {\n this."+s.toLowerCase()+"="+s.toLowerCase()+";\n}\n"; } } return str; } }
不用框架自己写的，还有漏吊的，还有很多，没有写明白的，望指正