package com.enhance.jdbc;

import java.beans.PropertyVetoException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;

import com.mchange.v2.c3p0.ComboPooledDataSource;

//c3p0 下载地址:http://sourceforge.net/projects/c3p0/
//需要 c3p0.jar  mchange-commons-java.jar
public class C3p0ConnectionPool {
	private static ComboPooledDataSource ds=new ComboPooledDataSource();
	private PreparedStatement pstmt;
	private ResultSet rs;
	
	static{
		Properties prop=new Properties();
		try {
			prop.load(new FileInputStream("src/mysql.ini"));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			ds.setDriverClass(prop.getProperty("driver"));
		} catch (PropertyVetoException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		ds.setJdbcUrl(prop.getProperty("url"));
		ds.setUser(prop.getProperty("user"));
		ds.setPassword(prop.getProperty("pass"));
		ds.setMaxPoolSize(Integer.parseInt(prop.getProperty("maxActive")));
		ds.setMinPoolSize(Integer.parseInt(prop.getProperty("minIdle")));
		ds.setInitialPoolSize(Integer.parseInt(prop.getProperty("initialSize")));
		ds.setMaxStatements(Integer.parseInt(prop.getProperty("maxStatements")));
		
		
		
	}
	
	public Connection getConenction() throws SQLException{
		return ds.getConnection();
	}
	
	public void executeUpdate() throws SQLException{
		Connection con=null;
		try {
			con=this.getConenction();
			pstmt=con.prepareStatement("insert into img_table(img_name,img_data) values (?,?)");
			pstmt.setString(1, "连接池进行blob数据的新增");
			File file=new File("F:\\androidworkspace\\LauncherActivity\\res\\drawable-nodpi\\wallpaper.jpg");
			pstmt.setBinaryStream(2, new FileInputStream(file));
			int rows=pstmt.executeUpdate();
			System.out.println(rows);
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			if(pstmt!=null)
				pstmt.close();
			if(con!=null)
				con.close();
		}
	}
	
	public void execute()throws SQLException{
		Connection con=null;
		try {
			con=this.getConenction();
			pstmt=con.prepareStatement("select img_id,img_name,img_data from img_table"); // where img_id=?
			//pstmt.setInt(1, 3);
			rs =pstmt.executeQuery();
			while(rs.next()){
				File file=new File("C:\\Users\\Bin\\Desktop\\"+rs.getString(2)+".jpg");
				Blob blob=rs.getBlob(3);
				//InputStream in=blob.getBinaryStream();
				OutputStream out=new FileOutputStream(file);
				out.write(blob.getBytes(1l, (int) blob.length()));
				/*byte[] b=new byte[1024];
				
				while(in.read(b,0,b.length)!=-1){
					out.write(b);
					out.flush();
				}*/	
				//in.close();
				out.close();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			if(pstmt!=null)
				pstmt.close();
			if(con!=null)
				con.close();
		}
		
	}
	
	public static void main(String[] args) throws SQLException {
		// TODO Auto-generated method stub
		DBCPConnectionPool dbcppool=new DBCPConnectionPool();
		dbcppool.executeUpdate();
		dbcppool.execute();
	}

}

package com.enhance.jdbc;

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.sql.Blob;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

import org.apache.commons.dbcp.BasicDataSource;

//DBCP 下载地址:http://commons.apach.org/
//需要 commond-dbcp.jar  commons-pool.jar
public class DBCPConnectionPool {
	private static BasicDataSource ds=new BasicDataSource();
	private PreparedStatement