clobtest.java

各种数据保存：字符型

package cn.itcast.jdbc;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class ClobTest {

	/**
	 * @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 clob_test(ctest) values(?)";
			conn = JdbcUtils.getConnection();
			File file = new File("src/cn/itcast/jdbc/JdbcUtils.java");
			Reader reader = new BufferedReader(new FileReader(file));
			ps = conn.prepareStatement(sql);
			ps.setCharacterStream(1, reader, (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 ctest from clob_test";
			ps = conn.prepareStatement(sql);
			rs = ps.executeQuery();

			while (rs.next()) {
				Writer writer = new BufferedWriter(new FileWriter(
						"JdbcUtils_bak.java"));
				Reader reader = rs.getCharacterStream("ctest");
				char[] buf = new char[1024];
				for (int i = 0; (i = reader.read(buf)) > 0;) {
					writer.write(buf, 0, i);
				}
				writer.close();
				reader.close();
			}
		} finally {
			JdbcUtils.realse(rs, ps, conn);
		}
	}
}