e276. cancelling updates to an updatable result set.txt

来自「这里面包含了一百多个JAVA源文件」· 文本 代码 · 共 18 行

The effects of calling Result.updateXXX() methods can be cancelled by calling cancelRowUpdates(). However, updates cannot be cancelled after updateRow() has been called. 
    try {
        // Create an updatable result set
        Statement stmt = connection.createStatement(
            ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
        ResultSet resultSet = stmt.executeQuery("SELECT * FROM my_table");
    
        // Move cursor to the row to update
        resultSet.first();
    
        // Update the value of column col_string on that row
        resultSet.updateString("col_string", "new data");
    
        // Discard the update to the row
        resultSet.cancelRowUpdates();
    } catch (SQLException e) {
    }