Tag: null

Camund-ENGINE-16004 Exception while closing command context null

ENGINE-16004 Exception while closing command context null 1. Cause of the problem This problem occurs when using the Camunda engine to execute the process When designing the process (Camunda modeler process editor), the incoming parameters are initially set through the inputs column in the node to realize the setting of the dynamic assignee Assingnee. This […]

django.db.utils.IntegrityError: (1048, “Column ‘spu_id’ cannot be null”) About RESTframework using serializer error…

ERROR exception 132 Internal Server Error: /meiduo_admin/goods/specs/ Traceback (most recent call last): File “D:\python_learn\meiduo_project\env\lib\site-packages\django\db\backends\utils.py”, line 64, in execute return self.cursor.execute(sql, params) File “D:\python_learn\meiduo_project\env\lib\site-packages\django\db\backends\mysql\base.py”, line 101, in execute return self.cursor.execute(query, args) File “D:\python_learn\meiduo_project\env\lib\site-packages\pymysql\cursors.py”, line 170, in execute result = self._query(query) File “D:\python_learn\meiduo_project\env\lib\site-packages\pymysql\cursors.py”, line 328, in _query conn.query(q) File “D:\python_learn\meiduo_project\env\lib\site-packages\pymysql\connections.py”, line 517, in query self._affected_rows = self._read_query_result(unbuffered=unbuffered) […]

[C++]: auto keyword (C++11) + range-based for loop (C++11) + pointer null value nullptr (C++11)

auto keyword (C++11) As the program becomes more and more complex, the types used in the program become more and more complex, often reflected in: Type is difficult to spell Unclear meaning leads to error-prone #include <string> #include <map> int main() {<!– –> std::map<std::string, std::string> m{<!– –> {<!– –> “apple”, “apple” }, {<!– –> “orange”, […]

C++auto & range for & nullptr

Table of Contents One, auto 1. Thinking about type aliases 2. Introduction to auto 3. Details of using auto 1. Auto is used in combination with pointers and references. 2. Define multiple variables on the same line 3. Scenarios where auto cannot be deduced 2. Range-based for loop 1. The syntax of range for 2. […]

Error setting non null for parameter #1 with JdbcType null . dm.jdbc.driver.DMException: Invalid sequence number

Problem occurred org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{<!– –>property=’__frch_item_0.batchId’, mode=IN, javaType=class java.lang.Long, jdbcType=null, numericScale=null, resultMapId=’null’, jdbcTypeName=’null’, expression=’null’}. Cause: org. apache.ibatis.type.TypeException: Error setting non null for parameter #1 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: dm.jdbc.driver.DMException: The sequence number […]

The wonderful world of virtual interfaces: the incredible uses of LoopBack, NULL, and InLoopBack

Hello, this is the Network Technology Alliance site. In the world of computer networks, various interfaces and protocols form the basis of network communication. In network device management and configuration, LoopBack interface, NULL interface and InLoopBack interface are special and important virtual interfaces. Although they are not eye-catching, they play a key role in the […]

(default parameter) & (function overloading) & (reference) & (inhibited) & (nullptr in C++)

(default parameters) & amp; (function overloading) & amp; (reference) & amp; (inhibited) & amp; (atuo usage) & amp; (NULL in C++) 1.Default parameters 1.1 Concept of default parameters 1.2 Classification of default parameters 1.3 Notes on default parameters 2. Function overloading 2.1 The concept of overloading 2.2 C++ supports the principle of function overloading-name modification […]

[Elementary C++] Reference&inline function&auto keyword&range for loop&nullptr

================================================== ======================= There are more series of columns on the personal homepage: Xiaobai is not a program Yuan My little warehouse: Gitee C++ series column: C++ headache ================================================== ======================= Table of Contents Preface Quote concept Characteristics of citations Often quoted Referenced usage scenarios Make parameters do return value The difference between reference and pointer The […]