自动增量主键值给出空值错误

Question

我正在尝试使用“Spring MVC”项目将数据插入Microsoft服务器管理工​​作室表。

联系人ID已设为NOT NULL和AUTO INCREMENT by 1。即使它试图插入null。

我定义user id主键不为null和identity 1.这是创建表的查询：

CREATE TABLE contact (
  contact_id[int] IDENTITY(1,1) NOT NULL,
  name varchar(45) NOT NULL,
  email varchar(45) NOT NULL,
  address varchar(45) NOT NULL,
  telephone varchar(45) NOT NULL,
  PRIMARY KEY (contact_id)
) 

表设计：

错误：

SEVERE: Servlet.service() for servlet [SpringDispatcher] in context with path [/SpringMvcJdbcTemplate] threw exception [Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: PreparedStatementCallback; SQL [INSERT INTO contact (name, email, address, telephone) VALUES (?, ?, ?, ?)]; Cannot insert the value NULL into column 'contact_id', table 'contactdb.dbo.contact'; column does not allow nulls. INSERT fails.; nested exception is com.microsoft.sqlserver.jdbc.SQLServerException: Cannot insert the value NULL into column 'contact_id', table 'contactdb.dbo.contact'; column does not allow nulls. INSERT fails.] with root cause
com.microsoft.sqlserver.jdbc.SQLServerException: Cannot insert the value NULL into column 'contact_id', table 'contactdb.dbo.contact'; column does not allow nulls. INSERT fails.

代码行：

//插入

    String sql = "INSERT INTO contact (name, email, address, telephone)"
                + " VALUES ('" + contact.getName() + "', '" + contact.getEmail() + "', '" + contact.getAddress() + "', '" + contact.getTelephone() + "')";
    jdbcTemplate.update(sql);

更新

CREATE TABLE contact (
  contact_id int IDENTITY NOT NULL PRIMARY KEY,
  name varchar(45) ,
  email varchar(45) NOT NULL,
  address varchar(45) NOT NULL,
  telephone varchar(45) NOT NULL
) 

Answer 1

创建一个过程或在默认值中添加SCOPE_IDENTITY（）方法。