用于连接数据库的JUNIT测试用例

这是我测试JDBC连接的代码

package com.sybase; public class SybaseDBConnection { public static Properties prop = null; public static Connection getConnection(String databaseType) { Connection conn = null; // Properties prop = null; String database = null; String driver = null; String url = null; String user = null; String password = null; try { // prop = new Properties(); // prop.load(SybaseDBConnection.class.getClassLoader() // .getResourceAsStream("com/properties/sybase.properties")); database = prop.getProperty("sybase." + databaseType + ".databaseName"); driver = prop.getProperty("sybase." + databaseType + ".driverClassName"); url = prop.getProperty("sybase." + databaseType + ".url"); user = prop.getProperty("sybase." + databaseType + ".username"); password = prop.getProperty("sybase." + databaseType + ".password"); // String dbConUrl = // "jdbc:datadirect:sqlserver://nt64sl2003a.americas.progress.comsql2008;Port=1433;DatabaseName=test;User=test;Password=test;EnableBulkLoad=true;BulkLoadBatchSize=" // + JDBC_BATCH_SIZE; String dbConUrl = url + SEMI_COLLAN + "DatabaseName=" + database + SEMI_COLLAN + "User=" + user + SEMI_COLLAN + "Password=" + password + SEMI_COLLAN + "EnableBulkLoad=true" + SEMI_COLLAN + "BulkLoadBatchSize=" + JDBC_BATCH_SIZE; System.out.println("The URL is : " + dbConUrl); SybDriver sybDriver = (SybDriver) Class.forName(driver) .newInstance(); sybDriver.setVersion(com.sybase.jdbcx.SybDriver.VERSION_6); DriverManager.registerDriver(sybDriver); conn = DriverManager.getConnection(dbConUrl); } catch (SQLException e) { System.err.println("Exception occured : SQLException : " + e.getMessage()); e.printStackTrace(); } catch (InstantiationException e) { System.err.println("Exception occured : InstantiationException : " + e.getMessage()); e.printStackTrace(); } catch (IllegalAccessException e) { System.err.println("Exception occured : IllegalAccessException : " + e.getMessage()); e.printStackTrace(); } catch (ClassNotFoundException e) { System.err.println("Exception occured : ClassNotFoundException : " + e.getMessage()); e.printStackTrace(); } return conn; } public static void closeConnection(Connection conn) { try { if (null != conn) { conn.close(); conn = null; } } catch (SQLException e) { e.printStackTrace(); } } public static void closeResultset(ResultSet rs) { try { if (null != rs) { rs.close(); rs = null; } } catch (SQLException e) { e.printStackTrace(); } } public static void closePreparedStatement(PreparedStatement pstmt) { try { if (null != pstmt) { pstmt.close(); pstmt = null; } } catch (SQLException e) { e.printStackTrace(); } } public static void closeStatement(Statement stmt) { try { if (null != stmt) { stmt.close(); stmt = null; } } catch (SQLException e) { e.printStackTrace(); } } public static String getProperty(String property) { return prop.getProperty(property); } public static void main(String args[]) { SybaseDBConnection.getConnection("ase"); } } 

我写了这个测试用例

 public class SybaseStatementTest { Connection conn; Statement stmt; // Setup methods @BeforeClass public void beforeClass() { conn = null; stmt = null; } // clean up method @AfterClass public void releaseResource() { if (stmt != null) { SybaseDBConnection.closeStatement(stmt); } if (conn != null) { SybaseDBConnection.closeConnection(conn); } } // Test case to check close statement using ASE database @Before public void openConnBeforerStmtTestASE() throws SQLException { conn = SybaseDBConnection.getConnection("ase"); stmt = conn.createStatement(); } @After public void closeConnAfterStmtTestASE() { if (conn != null) { SybaseDBConnection.closeConnection(conn); } } @Test public void testCloseStatementASE() { SybaseDBConnection.closeStatement(stmt); Assert.assertNull("Error occured", stmt); } } 

当我运行这个Junit测试用例时，我收到一个初始化错误（@BeforeClass应该是静态的）。 请帮忙吗？

Answer 1

@BeforeClass和@AfterClass在类级而不是实例上运行，因此方法必须是静态的。

您可以删除beforeClass方法。 它没有做任何有用的事情，因为实例变量无论如何都将默认为null。 并且还将@AfterClass更改为@After 。

测试本身不起作用，因为SybaseDBConnection.closeStatement将stmt设置为null，但这在方法外部不可见，因为它是一个局部变量。

您可以像下面这样编写测试：

 public class SybaseStatementTest { Connection connection; @Before public void before() { connection = SybaseDBConnection.getConnection("ase"); } @After public void after() { SybaseDBConnection.closeConnection(connection); } @Test public void closeStatementShouldCloseStatement() { Statement statement = connection.createStatement(); SybaseDBConnection.closeStatement(statement); assertTrue(statement.isClosed()); } @Test public void closeStatementWithNullShouldNotThrow() { SybaseDBConnection.closeStatement(null); } }