mybatis实现增删改查的工具类

直接上代码

public class JDBCUtils {
	static String resource = "com/oraro/cec/mybatis-config.xml";
	private static SqlSessionFactory sqlSessionFactory;

	public static SqlSessionFactory getInstance() {
		if (sqlSessionFactory == null) {
			synchronized (JDBCUtils.class) {
				if (sqlSessionFactory == null) {
					InputStream inputStream;
					try {
						inputStream = Resources.getResourceAsStream(resource);
						sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
						System.out.println("getInstance() " + e);
					}
				}
			}
		}

		return sqlSessionFactory;
	}

	public static Object selectOne(String method, Object object) {
		Object mObject = null;
		SqlSession session=getInstance().openSession();
		try {
			mObject = session.selectOne(method, object);
		} catch (Exception e) {
			e.printStackTrace();
			// TODO: handle exception
			System.out.println("数据库操作  " + e);
		} finally {
			synchronized (JDBCUtils.class) {
				if (session != null) {
					session.close();
				}
				session = null;
			}
		}
		return mObject;
	}

	public static List selectList(String method, Object object) {
		List mObjects = null;
		SqlSession session=getInstance().openSession();
		try {
			mObjects = session.selectList(method, object);
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("数据库操作  " + e);
		} finally {
			synchronized (JDBCUtils.class) {
				if (session != null) {
					session.close();
				}
				session = null;
			}
		}
		return mObjects;
	}
	public static List selectList(String method) {
		List mObjects = null;
		SqlSession session=getInstance().openSession();
		try {
			mObjects = session.selectList(method);
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("数据库操作  " + e);
		} finally {
			synchronized (JDBCUtils.class) {
				if (session != null) {
					session.close();
				}
				session = null;
			}
		}
		return mObjects;
	}
	public static List selectAll(String method) {
		List mObjects = null;
		SqlSession session=getInstance().openSession();
		try {
			mObjects =session.selectList(method);
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("数据库操作  " + e);
		} finally {
			synchronized (JDBCUtils.class) {
				if (session != null) {
					session.close();
				}
				session = null;
			}
		}
		return mObjects;
	}

	public static long insert(String method, Object entity) {
		long id = 0;
		SqlSession session=getInstance().openSession();
		try {
			id =session.insert(method, entity);
			// 这里必须commit,否则增删改无效
			session.commit();
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("数据库操作  " + e);
		} finally {
			synchronized (JDBCUtils.class) {
				if (session != null) {
					session.close();
				}
				session = null;
			}
		}
		return id;
	}

	public static long deleteById(String method, long id) {
		long mId = 0;
		SqlSession session=getInstance().openSession();
		try {
			mId = session.delete(method, id);
			// 这里必须commit,否则增删改无效
			session.commit();
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("数据库操作  " + e);
		} finally {
			synchronized (JDBCUtils.class) {
				if (session != null) {
					session.close();
				}
				session = null;
			}
		}
		return mId;
	}

	public static long update(String method, Object object) {
		long mId = 0;
		SqlSession session=getInstance().openSession();
		try {
			mId = session.update(method, object);
			// 这里必须commit,否则增删改无效
			session.commit();
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("数据库操作  " + e);
		} finally {
			synchronized (JDBCUtils.class) {
				if (session != null) {
					session.close();
				}
				session = null;
			}
		}
		return mId;
	}
}