下面的程序expddl.jsp可导出当前连接数据库的用户下的所有数据表的DDL.
EXPDDL.JSP:
<%@ page contentType="text/html; charset=gb2312" language="java" %
<%@ page import = "java.sql.*" %
<%@ page import = "oracle.jdbc.OracleDatabaseMetaData" %
<%@ page import = "oracle.jdbc.OracleResultSetMetaData" %
<%@ page import = "javax.sql.*,javax.naming.Context" %
<%@ page import = "javax.naming.InitialContext" %
<div align="center"
<%
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);
%
<div align="center"表名：<%= tname%</div
<table width="483" height="50" border="1" cellpadding="2" cellspacing="0"
<tr
<td<div align="center"序号</div</td
<td<div align="center"标识</div</td
<td<div align="center"类型/精度</div</td
<td<div align="center"标识说明</div</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<colcnt;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"<div align="center"<%= num++ %</div</td
<td width="98"<%=ormd.getColumnName(j+1)%</td<td width="144"<%= s %</td
<td width="173"</td </tr
<%
}
}
rs1.close();
st.close();
%
</table
<br
<%
}
rs.close();
conn.close();
%
</div