用clob , blob在mysql中建表 , 并使用jdbc操作

clob  对应四种类型 ，TINYTEXT ,    TEXT ,      MEDIUMTEXT , LONGTEXT

                             2的8次方     2的16次方      2的24次方          2的32次方

blob 对应四种类型  .  TINYBLOB ,     BLOB ,    MEDIUMBLOB , LONGBLOB

 

 

clob

create table testclob(id integer primary key auto_increment , content text);

 

 

blob

create tabke testblob(id integer primary key auto_increment , image blog);

 

 

package com.zly.test;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Test {
	
	public static void main2(String[] args) {
		Connection connection = null;
		PreparedStatement psmt = null;
		BufferedInputStream bis = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/jdbc" , "root" , "root");
			String sql = "insert into testjdbc(pic) values(?)";
			psmt = connection.prepareStatement(sql);
			File file = new File("src/tab.png");
			bis = new BufferedInputStream(new FileInputStream(file));
			psmt.setBinaryStream(1, bis, new Long(file.length()).intValue());
			int executeUpdate = psmt.executeUpdate();
			System.out.println(executeUpdate);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if(bis != null) {
				try {
					bis.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if(psmt != null) {
				try {
					psmt.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
			if(connection != null) {
				try {
					connection.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
		}
	}
	
	public static void main1(String[] args) {
		Connection connection = null;
		PreparedStatement psmt = null;
		ResultSet rs = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/jdbc" , "root" , "root");
			String sql = "select content from testjdbc where id = ?";
			psmt = connection.prepareStatement(sql);
			psmt.setInt(1, 1);
			rs = psmt.executeQuery();
			if(rs.next()) {
				String string = rs.getString("content");
				System.out.println(new String(string.getBytes() , "UTF-8"));
			}
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} finally {
			if(psmt != null) {
				try {
					psmt.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
			if(connection != null) {
				try {
					connection.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
		}
	}
	
	public static void main(String[] args) {
		InputStream binaryStream = null;
		OutputStream out = null;
		Connection connection = null;
		PreparedStatement prepareStatement = null;
		ResultSet executeQuery = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/jdbc", "root", "root");
			String sql = "select pic from testjdbc where id = ?";
			prepareStatement = connection.prepareStatement(sql);
			prepareStatement.setInt(1, 1);
			executeQuery = prepareStatement.executeQuery();
			if(executeQuery.next()) {
				binaryStream = executeQuery.getBinaryStream("pic");
				out = new FileOutputStream("src/tab_bak.png");
				byte[] bytes = new byte[1024];
				int read = 0;
				while((read = binaryStream.read(bytes)) != -1) {
					out.write(bytes , 0 , read);
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
	 	} finally {
	 		if(binaryStream != null) {
	 			try {
					binaryStream.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
	 		}
	 		if(out != null) {
	 			try {
					out.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
	 		}
	 		if(executeQuery != null) {
	 			try {
					executeQuery.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
	 		}
	 		if(prepareStatement != null) {
	 			try {
					prepareStatement.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
	 		}
	 		if(connection != null) {
	 			try {
					connection.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
	 		}
	 	}
	}
	
}