用JSP导出ORACLE的数据表DDL

<%
DataSource ds = null;

Context ic = new InitialContext();
ds = (DataSource) ic.lookup("java:comp/env/jdbc/mydb");

Connection conn = ds.getConnection();

OracleDatabaseMetaData odmd = (OracleDatabaseMetaData) conn.getMetaData();
String us = odmd.getUserName();
String[] types = new String[1];
types[0] = "TABLE";
ResultSet rs = odmd.getTables(null,us,"%",types);
while(rs.next()) {
//取表名
String tname = rs.getString(3);
%>

<table width="483" height="50" border="1" cellpadding="2" cellspacing="0">
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<%
Statement st = conn.createStatement();
ResultSet rs1 = st.executeQuery("select * from " + tname);
OracleResultSetMetaData ormd = (OracleResultSetMetaData) rs1.getMetaData();
//取列总数
int colcnt = ormd.getColumnCount();
//列序号
int num = 1;
for(int j=0;j String s = ormd.getColumnTypeName(j+1).toLowerCase();
//只处理varchar2 char date number类型(根据需要添加相应的处理)
if(s.equals("varchar2") || s.equals("char") || s.equals("date") || s.equals("number")) {
if(s.equals("varchar2") || s.equals("char"))
s = s + "(" + ormd.getColumnDisplaySize(j+1) + ")";
if(s.equals("number"))
s = s + "(" + ormd.getPrecision(j+1) + "," + ormd.getScale(j+1) + ")";
%>
<tr>
<td width="40">

<%= num++ %>

</td>
<td width="98"><%=ormd.getColumnName(j+1)%></td><td width="144"><%= s %></td>
<td width="173"> </td> </tr>
<%
}
}
rs1.close();
st.close();
%>
</table>


<%
}
rs.close();
conn.close();
%>