一个坑:java.sql.ResultSet.getInt==》the column value; if the value is SQL NULL, the value returned is 0

简介: Retrieves the value of the designated column in the current row of this ResultSet object as a String in the Java programming language.

Retrieves the value of the designated column in the current row of this ResultSet object as a String in the Java programming language.

Parameters:
columnLabel the label for the column specified with the SQL AS clause. If the SQL AS clause was not specified, then the label is the name of the column
Returns:
the column value; if the value is SQL NULL, the value returned is null
Throws:
SQLException - if the columnLabel is not valid; if a database access error occurs or this method is called on a closed result set
 

int java.sql.ResultSet.getInt(String columnLabel) throws SQLException

Retrieves the value of the designated column in the current row of this ResultSet object as an int in the Java programming language.

Parameters:
columnLabel the label for the column specified with the SQL AS clause. If the SQL AS clause was not specified, then the label is the name of the column
Returns:
the column value; if the value is SQL NULL, the value returned is 0
Throws:
 
 
 
 
相关文章
|
19天前
|
存储 开发者
HashMap和Hashtable的key和value可以为null吗,ConcurrentHashMap呢
HashMap的key可以为null,value也可以为null;Hashtable的key不允许为null,value也不能为null;ConcurrentHashMap的key不允许为null
|
23天前
|
SQL 分布式计算 Java
Hadoop-11-MapReduce JOIN 操作的Java实现 Driver Mapper Reducer具体实现逻辑 模拟SQL进行联表操作
Hadoop-11-MapReduce JOIN 操作的Java实现 Driver Mapper Reducer具体实现逻辑 模拟SQL进行联表操作
30 3
|
2月前
|
SQL Java
使用java在未知表字段情况下通过sql查询信息
使用java在未知表字段情况下通过sql查询信息
31 1
|
3月前
|
API 计算机视觉
Using ‘value‘ pointer is unsafe and deprecated. Use NULL as value pointer. To fetch trackbar value s
本文讨论了OpenCV中使用`createTrackbar`时遇到的"Using ‘value’ pointer is unsafe and deprecated"警告,并提供了通过设置空指针或使用回调函数来解决这个问题的方法。
Using ‘value‘ pointer is unsafe and deprecated. Use NULL as value pointer. To fetch trackbar value s
|
3月前
解决微软云Azure Function运行报错-Value cannot be null. (Parameter ‘provider‘)
解决微软云Azure Function运行报错-Value cannot be null. (Parameter ‘provider‘)
72 4
|
3月前
|
JSON 前端开发 JavaScript
JSON parse error: Cannot deserialize value of type `java.lang.Integer` from Boolean value
这篇文章讨论了前端Vue应用向后端Spring Boot服务传输数据时发生的类型不匹配问题,即后端期望接收的字段类型为`int`,而前端实际传输的类型为`Boolean`,导致无法反序列化的问题,并提供了问题的诊断和解决方案。
JSON parse error: Cannot deserialize value of type `java.lang.Integer` from Boolean value
|
3月前
|
SQL Java 数据库连接
【Azure 应用服务】Java ODBC代码中,启用 Managed Identity 登录 SQL Server 报错 Managed Identity authentication is not available
【Azure 应用服务】Java ODBC代码中,启用 Managed Identity 登录 SQL Server 报错 Managed Identity authentication is not available
|
3月前
|
C++ Python
【Azure 应用服务】Azure Function Python函数部署到Azure后遇见 Value cannot be null. (Parameter 'receiverConnectionString') 错误
【Azure 应用服务】Azure Function Python函数部署到Azure后遇见 Value cannot be null. (Parameter 'receiverConnectionString') 错误
|
3月前
|
JavaScript 前端开发 C++
【Azure Function】调试 VS Code Javascript Function本地不能运行,报错 Value cannot be null. (Parameter 'provider')问题
【Azure Function】调试 VS Code Javascript Function本地不能运行,报错 Value cannot be null. (Parameter 'provider')问题
|
4月前
|
SQL
SQL NOT NULL 约束
【7月更文挑战第18天】SQL NOT NULL 约束。
43 6