Java、XML与数据库编程实践(四)

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

protected boolean alreadyin(String tname,String colname, String value)

{

int result;

ResultSet rst=null;

try {

//执行SQL语句

String query = "select "+colname+" from "+tname+" where "+colname+"='"+value+"'";

Statement statement = connformax.createStatement();

rst = statement.executeQuery( query );

if(rst.next())

{

statement.close();

rst.close();

return true;

}

}

catch ( SQLException sqlex ) {

sqlex.printStackTrace();

return false;

}

return false;

}

protected int getIdfromNumber(String tname,String colname, String value)

{

int result;

ResultSet rst=null;

try {

Connection conn= DriverManager.getConnection( destPara.getUrl(), destPara.getUsername(),destPara.getPassword());

String query = "select id,"+colname+" from "+tname+" where "+colname+"='"+value+"'";

System.out.println(query);

Statement statement = conn.createStatement();

rst = statement.executeQuery( query );

if(rst.next())

{

return rst.getInt("id");

}

}

catch ( SQLException sqlex ) {

sqlex.printStackTrace();

return 0;

}

return 0;

}

/**

* 得到某个表中的最大的id号

*/

protected int getMax(String tname)

{

int result;

ResultSet rst=null;

try {

//执行SQL语句

String query = "select Max(id) from "+tname;

Statement statement = connformax.createStatement();

rst = statement.executeQuery( query );

if(rst.next())

{

return rst.getInt(1)+1;

}

}

catch ( SQLException sqlex ) {

sqlex.printStackTrace();

return 0;

}

return 1;

}

/**

* 执行某一段sql语句

*/

public static void execute(ConnPara connpara,String stmt) throws SQLException

{

Connection conn=null;

PreparedStatement ps = null;

try {

conn=DriverManager.getConnection( connpara.getUrl(), connpara.getUsername(), connpara.getPassword());

System.out.println(stmt);

ps = conn.prepareStatement(stmt);

ps.executeUpdate();

} catch (Exception e) {

e.printStackTrace();

System.out.println(e.getMessage());

} finally {

if (ps!=null) ps.close();

if (conn!=null)conn.close();

}

}

public static void main(String argc[])

{

DbInput copydb=new DbInput();

copydb.dbInit();

copydb.copyproduct();

}

}

问题:

1) access数据库不能直接由jdbc读写,解决办法是先把access配置在ODBC中,然后再通过ODBC来操作access数据库。

2) 执行时找不到com.microsoft.jdbc.sqlserver.SQLServerDriver类,这是因为在运行这个类时,要下载微软的jdbc包,这个包中有三个文件: msbase.jar,mssqlserver.jar,msutil.jar,把这三个文件包含进去,就不会有问题了。

 
 
 
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