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);
%>








<%
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;jString 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) + ")";
%>




<%
}
}
rs1.close();
st.close();
%>

序号	标识	类型/精度	标识说明
<%= num++ %>	<%=ormd.getColumnName(j+1)%>	<%= s %>

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