if (entityInfo.EntityColumnInfo.PropertyInfo.GetCustomAttribute<DefaultInsertAttribute>()!=null && entityInfo.OperationType == DataFilterType.InsertByObject) { if (oldValue is not null) { entityInfo.SetValue(oldValue); } else { if (entityInfo.EntityColumnInfo.DefaultValue is not null) { entityI...
DBNull.Value是一个有着内存地址的具体类型的值,映射了数据库中的null值; 而NULL则是空指向,不存在对应的内存地址。任何对象赋值为null后,内存就释放了。 举个例子: 从数据库读数据 返回 DataTable 值。vardata = conn.ExecuteDataTable(sql,"Datatable"); 如果A列在数据库中为null值if( data.Rows[0]["A...
If i choose select * from #Service where id=5 , it must return some constant value if there is no record on the table, (say the default value is 10,Notavail) else return the value . Can this be done, i have used isnull, nullif and colase, case on select, nothing worked, Thanks...
[Execute SQL Task] Error: The value type (__ComObject) can only be converted to variables of type Object. [ODBC Driver Manager] Data source name not found and no default driver specified [ODBC SQL Server Driver] Invalid Parameter Number/ Invalid Description or Index [Sql server 2012] Change...
Type: Boolean; recognized values are 1 and 0, or true and false; any other value interpreted as false Default: false (shown as 0 in output of SET statement) 参考 Query Options for the SET Statement DECIMAL_V2 Query Option CDH6中Impala3报错UDF ERROR: String to Decimal parse failed ...
error("dup close"); } return; } if (!this.abandoned) { DruidAbstractDataSource dataSource = holder.getDataSource(); dataSource.recycle(this); } this.holder = null; conn = null; transactionInfo = null; closed = true; } recycle方法主要是执行dataSource.recycle(this) DruidDataSource....
sqlstate-value IN handler-name:error-description -502 CURSOR ALREADY OPEN -503 SQL REJECTED INVALID INPUT FOR REASON -504 PLAN OPTION ERROR: error-string -505 ON-CLAUSE ERROR: x NOT ALLOWED -530 PROC authid.name: msg-string -531 PROC authid.name: msg-string -532 TRIG authid.na...
Checks for SQL Server errors by testing @@ERROR. If @@ERROR isn't equal to zero, the procedure returns the return code 3. If @@ERROR was equal to zero, the procedure checks to see if the @SalesYTD parameter value is NULL. If no year to date sales were found, the procedure returns...
In SQL null is not equal ( = ) to anything—not even to another null . According to the three-valued logic of SQL, the result of null = null is not true but unknown. SQL has the is [not] null predicate to test if a particular value is null . ...
Here, I will tell you the possible ways to return calculated Boolean values from SQL Server code. At a lot of places, you want to progress conditionally. You send some input values to the stored procedure and want to get a Boolean value which decides the