JDBC怎么直接訪(fǎng)問(wèn)mysql數據庫

這篇文章主要介紹“JDBC怎么直接訪(fǎng)問(wèn)數據庫”，在日常操作中，相信很多人在JDBC怎么直接訪(fǎng)問(wèn)mysql數據庫問(wèn)題上存在疑惑，小編查閱了各式資料，整理出簡(jiǎn)單好用的操作方法，希望對大家解答”JDBC怎么直接訪(fǎng)問(wèn)mysql數據庫”的疑惑有所幫助！接下來(lái)，請跟著(zhù)小編一起來(lái)學(xué)習吧！

import com.mysql.jdbc.Driver;

import java.sql.Connection;

import java.sql.Statement;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.ResultSetMetaData;

import java.io.*;

import java.sql.*;

public class Database {

privateConnection connection = null;

public boolean Init( String url, String userName, String password) throws Exception

{

Class.forName("com.mysql.jdbc.Driver").newInstance();

connection = DriverManager.getConnection(url, userName, password);

return true;

}

public void Test() throws Exception

{

Statement st = connection.createStatement();

//Insert

//st.execute("Insert into setup values ( '13', '22') ");

//Test Blob field

//Write Test

File file1 = new File("Database.java");

int len1 = (int) file1.length();

InputStream fis1 = new java.io.FileInputStream(file1);

PreparedStatement ps = connection.prepareStatement("INSERT INTO setup VALUES (?, ?,?)");

ps.setString(1, "250");

ps.setString(2, "250ddd");

ps.setAsciiStream(3, fis1, len1);

ps.execute();

ResultSet r = st.executeQuery("select * from setup");

if( r!= null )

{

ResultSetMetaData m = r.getMetaData();

while( r.next())

{

for( int i = 1; i<= m.getColumnCount(); i++ )

{

System.out.println( m.getColumnLabel(i) + "=" + r.getObject(i).toString() );

}

java.sql.Blob ablob = r.getBlob(3);

System.out.println( r.getString(1) + " " +r.getString(2) + " " + ablob.length());

InputStream bis = ablob.getBinaryStream() ;

OutputStream os = new FileOutputStream("test.java");

int b = bis.read();

while (b != -1 ) {

System.out.print((char)b);

os.write((char)b);

b = bis.read();

}

os.flush();

os.close();

bis.close();

}

}

else

{

System.out.println("The table is empty.");

}

//Read Test

}

public static void main( String []args)

{

Database db = new Database();

try

{

db.Init("jdbc:mysql://localhost:3306/jivejdon?useUnicode=true&characterEncoding=gbk", "root", "root");

db.Test();

}

catch ( Exception e )

{

e.printStackTrace();

}

}

}