optable.java

本套光盘提供了本书各章实例的所需的部分源程序文件以及数据库文件。读者 需要使用JDK 1.4(必需）版

import java.sql.*;
import java.net.URL;

class optable{
public static void main (String args[]) {
	String url= 
"jdbc:microsoft:sqlserver://localhost:1433;User=JavaDB;Password=javadb;DatabaseName=northwind";
	String query = "Create Table testtable(ID int)";
	String insert1 = "Insert into SecondTable Values (1,'test1','none','no')";
	String insert2 = "Insert into SecondTable Values (2,'test2','none','no')";
String query1 = "Create Table SecondTable(ID INT Not NULL UniQUE, Name VARChar(30),Types VARChar(30),Detail VARChar(100))";
	String query2 = "Drop Table testtable";
	String query0 = "Select * from SecondTable";
	try {

		//加载jdbc-odbc桥驱动程序
		Class.forName ("com.microsoft.jdbc.sqlserver.SQLServerDriver");
		Connection con = DriverManager.getConnection (url);
		DatabaseMetaData dbmd = con.getMetaData();

		//建立一个Statement对象,用这个对象向驱动程序发送SQL语句
		Statement stmt = con.createStatement ();

		//执行SQL更新操作
		stmt.executeUpdate(query);
		stmt.executeUpdate(query1);
		stmt.executeUpdate(insert1);
		stmt.executeUpdate(insert2);

		//显示结果集的所有行和列
		ResultSet rs = stmt.executeQuery(query0);
		dispResultSet (rs);
		
		//显示数据库元数据
		System.out.println("show all the tables in the database:");
		displayMetadata(dbmd);
		
		//删除testtable
		stmt.executeUpdate(query2);

		//显示数据库元数据
		System.out.println("show all the tables in the database after drop testtable:");
		displayMetadata(dbmd);

		// 关闭结果集
		rs.close();

		// 关闭statement对象
		stmt.close();

		// 关闭连接
		con.close();
	}
	catch (SQLException ex) {
		System.out.println ("\n*** SQLException caught ***\n");
		while (ex != null) {
			System.out.println ("SQLState: " +	ex.getSQLState ());
			System.out.println ("Message:  " + ex.getMessage ());
			System.out.println ("Vendor:   " +	ex.getErrorCode ());
			ex = ex.getNextException ();
			System.out.println ("");
		}
	}
	catch (java.lang.Exception ex) {
			//捕获其他类型的例外
			ex.printStackTrace ();
	}
}

// dispResultSet 现实整个结果届中的所有的行和列
private static void dispResultSet (ResultSet rs) throws SQLException
{
	int i;
	//取得结果集的元数据
	ResultSetMetaData rsmd = rs.getMetaData ();

	// 获得结果集的列数
	int numCols = rsmd.getColumnCount ();

	// 显示列的标题

	for (i=1; i<=numCols; i++) {
		if (i > 1) System.out.print(",     ");
		System.out.print(rsmd.getColumnLabel(i));
	}
	System.out.println("");
	
	//显示结果集中所有数据
	boolean more = rs.next ();
	while (more) {

	//循环显示结果集中的所有数据
	for (i=1; i<=numCols; i++) {
			if (i > 1) System.out.print(",  ");
			System.out.print(rs.getString(i));
		}
	System.out.println("");
	System.out.println("");
	//获得下一行数据
	more = rs.next ();
	}
}
//显示数据库中的所有表格名称
private static void displayMetadata(DatabaseMetaData dbmd)
{
	String table[] = {"TABLE"};
	try
	{
ResultSet rset =dbmd.getTables(null,null,null,table);
//ResultSet rset =dbmd.getTables(null,null,"%"+"table",table);
	while(rset.next())
	{
		System.out.print(rset.getString("TABLE_NAME") + "   ");
	}
	System.out.println("");
	rset.close();
	}
	catch(Exception e)
	{
		System.out.println("error");
	}
}
}