databaseoperation.java

java调用数据库检验程序是否可以与数据库相连

import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;

public class DataBaseOperation
{
    private Connection connection;                        
    	

       
    public DataBaseOperation(String driver,String url, String user, String password)
        throws ClassNotFoundException,SQLException
    {
        this.connection = null;
        Class.forName(driver);                           
        this.connection = DriverManager.getConnection(url,user,password);
    }

    public DataBaseOperation(String driver, String url) throws ClassNotFoundException,SQLException
    {
        this.connection = null;
        Class.forName(driver);
        this.connection = DriverManager.getConnection(url);
    }

    public void finalize() throws SQLException            
    {
        this.connection.close();
    }

    public String getDBAbout() throws SQLException         
    {
        String message = "";
        DatabaseMetaData dbmd = this.connection.getMetaData();
        message = "JDBC驱动程序：" + dbmd.getDriverName() +" "+ dbmd.getDriverVersion() + "\r\n" +
                  "JDBC URL：" + dbmd.getURL() + "\r\n" +
                  "数据库：" + dbmd.getDatabaseProductName() + "\r\n" +
                  "数据库版本：" + dbmd.getDatabaseProductVersion() + "\r\n"+
                  "用户名：" + dbmd.getUserName() + "\r\n";
        return message;
    }


    public int dataUpdate(String sql) throws SQLException
    {
        Statement statement = this.connection.createStatement(); 
        int result = statement.executeUpdate(sql);
        statement.close();
        return result;
    }

        
    public void select(String sql) throws SQLException
    {
        Statement statement = this.connection.createStatement();
        ResultSet resultset = statement.executeQuery(sql);       
        ResultSetMetaData rsmd = resultset.getMetaData();       
        int columnCount = rsmd.getColumnCount();               
        for(int j=1;j<=columnCount;j++)
            System.out.print(rsmd.getColumnLabel(j)+"  ");       
        System.out.println();
           
        while(resultset.next())                                 
        {
            for(int j=1;j<=columnCount;j++)                      
                System.out.print(resultset.getString(j)+"  ");   
            System.out.println();
        }
        resultset.close();
        statement.close();
    }
}