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.List;/*** *  2014-07-21日： *  oracle数据库， 表结构查询 ，字段信息查询，字段注释查询  *  表字段查询 all_tab_columns *  表字段注释查询 all_col_comments *  @author 王华荣 *  */public class OracleTable {    private static final String DRIVER_CLASS = "oracle.jdbc.driver.OracleDriver";    private static final String DATABASE_URL = "jdbc:oracle:thin:@192.168.1.10:1521:orcl";    private static final String DATABASE_USER = "dev";    private static final String DATABASE_PASSWORD = "dev";    private static Connection con = null;         public static Connection getConnection() {        try {            Class.forName(DRIVER_CLASS);            con=DriverManager.getConnection(DATABASE_URL,DATABASE_USER,DATABASE_PASSWORD);            return con;        } catch (Exception ex) {            System.out.println("2:"+ex.getMessage());        }        return con;    }         /***     * 打印test     * @throws SQLException     */    public static void sysoutStrTablePdmCloumns(String Table,String Owner) throws SQLException{        getConnection();                 List<HashMap<String,String>> columns = new ArrayList<HashMap<String,String>>();                 try{            Statement stmt = con.createStatement();                         String sql=             "select "+             "         comments as \"Name\","+             "         a.column_name \"Code\","+             "         a.DATA_TYPE as \"DataType\","+             "         b.comments as \"Comment\","+             "         decode(c.column_name,null,‘FALSE‘,‘TRUE‘) as \"Primary\","+             "         decode(a.NULLABLE,‘N‘,‘TRUE‘,‘Y‘,‘FALSE‘,‘‘) as \"Mandatory\","+             "         ‘‘ \"sequence\""+             "   from "+             "       all_tab_columns a, "+             "       all_col_comments b,"+             "       ("+             "        select a.constraint_name, a.column_name"+             "          from user_cons_columns a, user_constraints b"+             "         where a.constraint_name = b.constraint_name"+             "               and b.constraint_type = ‘P‘"+             "               and a.table_name = ‘"+Table+"‘"+             "       ) c"+             "   where "+             "     a.Table_Name=b.table_Name "+             "     and a.column_name=b.column_name"+             "     and a.Table_Name=‘"+Table+"‘"+             "     and a.owner=b.owner "+             "     and a.owner=‘"+Owner+"‘"+             "     and a.COLUMN_NAME = c.column_name(+)" +             "  order by a.COLUMN_ID";            System.out.println(sql);            ResultSet rs = stmt.executeQuery(sql);            while (rs.next()){                HashMap<String,String> map = new HashMap<String,String>();                map.put("Name", rs.getString("Name"));                map.put("Code", rs.getString("Code"));                map.put("DataType", rs.getString("DataType"));                map.put("Comment", rs.getString("Comment"));                map.put("Primary", rs.getString("Primary"));                map.put("Mandatory", rs.getString("Mandatory"));                columns.add(map);            }        }        catch (SQLException e){            e.printStackTrace();        }finally{            con.close();        }    }    public static void main(String[] args) throws SQLException{                 sysoutStrTablePdmCloumns("CT_INFO_CONTRACT_BORROW","DEV");                      }     }