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JDBC连接数据库和释放连接

Jun 07, 2016 pm 03:06 PM
java jdbc database Community Enter connect freed

欢迎进入Java社区论坛,与200万技术人员互动交流 >>进入 用久了hibernate现在对于JDBC是怎么实现数据库的连接和释放,所以特地总结下关于JDBC的知识,目的是用于提醒自己很多Java的基础知识需要健全。 package com.ssh.action; import java.sql.Connection;

欢迎进入Java社区论坛,与200万技术人员互动交流 >>进入

  用久了hibernate现在对于JDBC是怎么实现数据库的连接和释放,所以特地总结下关于JDBC的知识,目的是用于提醒自己很多Java的基础知识需要健全。

  package com.ssh.action;

  import java.sql.Connection;

  import java.sql.DriverManager;

  import java.sql.PreparedStatement;

  import java.sql.ResultSet;

  import java.sql.SQLException;

  import java.sql.Statement;

  /**

  * 数据库工具类

  * @author Administrator

  *

  */

  public class DBUtil {

  /**

  * 取得数据库连接

  * @return

  */

  public static Connection getConnection() {

  Connection conn = null;

  try {

  //取得jdbc配置信息

  JdbcInfo jdbcInfo =null; ///ConfigReader.getInstance().getJdbcInfo();

  Class.forName(jdbcInfo.getDriverName());

  conn = DriverManager.getConnection(jdbcInfo.getUrl(), jdbcInfo.getUsername(), jdbcInfo.getPassword());

  } catch (ClassNotFoundException e) {

  e.printStackTrace();

  } catch (SQLException e) {

  e.printStackTrace();

  }

  return conn;

  }

  /**

  * 关闭     PreparedStatement(预处理执行语句) 目的:可以防止SQL注入、在特定的驱动数据库下相对效率要高(不绝对)、不需要频繁编译.因为已经预加载了

  * @param pstmt

  */

  public static void close(PreparedStatement pstmt) {

  if (pstmt != null) {

  try {

  pstmt.close();

  } catch (SQLException e) {

  e.printStackTrace();

  }

  }

  }

  /**

  * 关闭连接

  * @param conn

  */

  public static void close(Connection conn) {

  if (conn != null) {

  try {

  conn.close();

  } catch (SQLException e) {

  e.printStackTrace();

  }

  }

  }

  /**

  * 关闭数据库结果集的数据表

  * @param rs

  */

  public static void close(ResultSet rs) {

  if (rs != null) {

  try {

  rs.close();

  } catch (SQLException e) {

  e.printStackTrace();

  }

  }

  }

  /**

  * 提交事务

  * @param conn

  */

  public static void commit(Connection conn) {

  if (conn != null) {

  try {

  conn.commit();

  } catch (SQLException e) {

  e.printStackTrace();

  }

  }

  }

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JDBC连接数据库和释放连接

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