JDBC连接数据库

//java连接数据库相关类，要测试成功需要导入mysql连接的jar包
//数据库连接类
package com.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DBC {
	// private static final String DBDRIVER="oracle.jdbc.driver.OracleDriver";
	// private static final String USERNAME="scott";
	// private static final String PASSWORD ="tiger";
	// private static final String
	// URL="jdbc:oracle:thin@localhost:1521:student";

	private static final String DBDRIVER = "com.mysql.jdbc.Driver";
	private static final String USERNAME = "root";
	private static final String PASSWORD = "";
	private static final String URL = "jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=utf-8";
	private Connection conn;

	public DBC() {
		try {
			Class.forName(DBDRIVER);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}

	public Connection conn() {
		try {
			conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}

	public void close() {
		if (conn != null) {
			try {
				conn.close();
				conn = null;
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}

}
//测试连接是否成功
package jdbc.test;

import java.sql.PreparedStatement;
import java.sql.SQLException;

import com.jdbc.DBC;

public class TestJDBC {

	public static void main(String[] args) {
		DBC d = new DBC();
		PreparedStatement pstmt = null;
		String sql = "insert into t_user (name,pwd) values(?,?)";
		try {
			pstmt = d.conn().prepareStatement(sql);
			pstmt.setString(1, "name1");
			pstmt.setString(2, "p");
			pstmt.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			if (pstmt != null) {
				try {
					pstmt.close();
					pstmt = null;
					d.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}

			}
		}
	}
}