How to check for null value in a resultset column (using C#)? How to check if DataSet is Empty? How to check If record Exist in the Database. How to check the record exist or not in the dataset how to check two dates to see if they are in the same week ...
check("-12.3"); check("07"); //普通十进制7 or 八进制7 //3)包含非法的字符,例如包含多余的小数点,包含多余的负号,以及其它非常规格式 check("123."); check(".123"); check("1.2.3"); check("--12.3"); check("-1-2.3"); check("-12.3-"); check(" 123"); check("1 23"); check...
if (mtxtCounty==null) mtxtCountry=""; before the Linq query. Tuesday, April 12, 2016 4:40 PM Hello! Stewa before executing the linq query first check that mtxtCounty(text field) is empty or not then use if else case like below ...
如果存在违反约束的数据行为,行为会被约束终止。约束可以在创建表时规定(通过 CREATE TABLE语句),或者在表创建之后规定(通过 ALTER TABLE语句)。not null非空约束unique 唯一约束primary key 主键约束Foreing key 外键约束check 检查约束DEFAULT - 规定没有给列赋值时的默认值。1、表级约...
GET-Error based-Single quotes-String(基于错误的 GET 单引号字符型注入) 判断注入类型 首先先注入正常的参数,网页回显正常的信息 ?id=1 尝试注入个单引号闭合,网页回显 MySQL 报错,说明存在注入漏洞 ?id=1' 接下来加个注释,我们观察到把后端的 SQL 语句后面的内容注释后,网页回显了正确的信息。也就是说我们注...
HiColumn hiColumn = tableInfo.Columns.Where(c => c.FieldName.Equals(dataColumn.ColumnName)).FirstOrDefault();if(hiColumn !=null) {//自增主键不能填也不能改vartipStr = hiColumn.IsIdentity ?"[不可修改]":"";varcnName = (string.IsNullOrEmpty(hiColumn.FieldDesc) ? dataColumn.ColumnName :...
SQL would be great if only we could debug queries. What if I told you can debug them! You can breakdown a complex query and create multiple temporary tables. Then you can run “sanity check” queries against those tables to make sure they contain correct entries. I highly recommend this ...
=null&&!splitPkSqls.isEmpty()){splitPkSql=splitPkSqls.get(i).toString();DBUtil.sqlValid(splitPkSql,dataBaseType);if(i==0){SingleTableSplitUtil.preCheckSplitPk(conn,splitPkSql,fetchSize,table,userName);}}}catch(ParserException e){……}}}finally{DBUtil.closeDBResources(null,conn);}returntrue...
public string CheckStringLength(string inputString, Int32 maxLength) 89 { 90 if ((inputString != null) && (inputString != String.Empty)) 91 { 92 inputString = inputString.Trim(); 93 94 if (inputString.Length > maxLength) 95
8.字符串操作（String Manipulation）SQL提供了各种字符串函数，用于操作和转换文本数据。像CONCAT、...