利用JDBC显示数据库详细信息---JSP实现

2024-09-05 00:19:19

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本来打算在控制台就ok了！但是效果不好看！在jsp上面写了一个管理类！还没有完全完工的！就是显示数据库表存储过程还有基本信息而已...代码如下

//database manager class
class dbm{
    private javax.servlet.jsp.jspwriter out;
    private connection con;
    private statement stmt;
    private resultset rs;
    public dbm(string drivername,string url,string username,string password,javax.servlet.jsp.jspwriter out)throws exception{
        class.forname(drivername);
        this.out=out;
        con=drivermanager.getconnection(url,username,password);
    }
    public void lookinfo()throws exception{
    databasemetadata dbmd=con.getmetadata();
    string tabletype=null;
    out.print("<strong>databaseinfo</strong><table>");
    out.print("<tr><td>databasename:</td><td>"+dbmd.getdatabaseproductname()+"</td></tr>");
    out.print("<tr><td>databaseversion:</td><td>"+dbmd.getdatabaseproductversion()+"</td></tr>");
    out.print("<tr><td>the numeric function:</td><td>"+dbmd.getnumericfunctions()+"</td></tr>");
    out.print("<tr><td>the string function:</td><td>"+dbmd.getstringfunctions()+"</td></tr>");
    out.print("<tr><td>the timedate function:</td><td>"+dbmd.gettimedatefunctions()+"</td></tr>");
    out.print("<tr><td>the system function:</td><td>"+dbmd.getsystemfunctions()+"</td></tr>");
    out.print("</table>");
    out.print("<strong>procedureinfo</strong><table>");
    getproceduredetail(dbmd.getprocedures(null,null,null));
    //show all the tables
    try{
      rs=dbmd.gettables(null,null,null,null);
    }catch(exception proe){}
    out.print("<strong>database tables info</strong><br>");
    while(rs.next()){
      tabletype=rs.getstring(4);
      out.print("<strong>tablename:</strong>"+rs.getstring(3)+" <strong>type:</strong>"+tabletype+"<br>");
      if(tabletype.indexof("view")>=0||tabletype.indexof("table")>=0){
       try{
        gettabledetail(dbmd.getcolumns(null,null,rs.getstring(3),null));
       }catch(exception columne){}
      }
    }
    this.closeall();
    }
    //show the column information
    private void gettabledetail(resultset tablers)throws exception{
        out.print("<table border=1><tr><td>column_name</td><td>data_type</td><td>type_name</td><td>column_size</td><td>is_nullable</td><td>char_octet_length</td></tr>");
        while(tablers.next()){
            out.print("<tr><td>"+tablers.getstring(4)+"</td><td>"+tablers.getint(5)+"</td><td>"+tablers.getstring(6)+"</td><td>"+tablers.getint(7)+"</td><td>"+tablers.getstring(18)+"</td><td>"+tablers.getint(16)+"</td></tr>");
        }
        out.print("</table>");
        tablers.close();
    }
    //show all the procedures
    private void getproceduredetail(resultset procrs)throws exception{
    out.print("<table border=1><tr><td>procedure_name</td><td>remarks</td><td>procedure_type</td></tr>");
    while(procrs.next()){
      out.print("<tr><td>"+procrs.getstring(3)+"</td><td>"+procrs.getstring(7)+"</td><td>"+procrs.getshort(8)+"</td></tr>");
    }
    out.print("</table>");
    procrs.close();
    }
    //close all the resource
    private void closeall()throws sqlexception{
        try{
            if(rs!=null)rs.close();
        }catch(exception e){
        }
        try{
            if(stmt!=null)stmt.close();
        }catch(exception e){
        }
        try{
        if(con!=null)con.close();
        }catch(exception e){
        }
    }
}