blobtest.java

各种数据保存：字符型

package cn.itcast.jdbc;

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

public class BlobTest {

	/**
	 * @param args
	 * @throws SQLException
	 * @throws IOException
	 */
	public static void main(String[] args) throws SQLException, IOException {
		// add();
		read();
		System.out.println("end");
	}

	static void add() throws SQLException, FileNotFoundException {
		Connection conn = null;
		PreparedStatement ps = null;
		ResultSet rs = null;
		try {
			String sql = "insert into blob_test(btest) values(?)";
			conn = JdbcUtils.getConnection();
			File file = new File("F:\\Picture\\PConline12gundamjt37.jpg");
			InputStream is = new BufferedInputStream(new FileInputStream(file));
			ps = conn.prepareStatement(sql);
			System.out.println(file.length());
			ps.setBinaryStream(1, is, (int) file.length());
			int i = ps.executeUpdate();
			System.out.println("i=" + i);
		} finally {
			JdbcUtils.realse(rs, ps, conn);
		}
	}

	static void read() throws SQLException, IOException {
		Connection conn = null;
		PreparedStatement ps = null;
		ResultSet rs = null;
		try {
			conn = JdbcUtils.getConnection();
			String sql = "select btest from blob_test";
			ps = conn.prepareStatement(sql);
			rs = ps.executeQuery();

			while (rs.next()) {
				OutputStream os = new BufferedOutputStream(
						new FileOutputStream("pic.jpg"));
				InputStream is = rs.getBinaryStream("btest");
				byte[] buf = new byte[1024];
				for (int i = 0; (i = is.read(buf)) > 0;) {
					os.write(buf, 0, i);
				}
				os.close();
				is.close();
			}
		} finally {
			JdbcUtils.realse(rs, ps, conn);
		}
	}
}