DataView.RowFilter的使用(包括in,like等SQL中的操作符)
DataView RowFilter Syntax [C#] Column names [C#] dataView.RowFilter = "id = 10"; // no special character in column name "id" Literals [C#] dataView.RowFilter = "Name = 'John'" // string value dataView.RowFilter = String.Format("Name = '{0}'", "John 'A'".Replace("'", "''")); Number values are not enclosed within any characters. The values should be the same as is the result of int.ToString() or float.ToString() method for invariant or English culture. [C#] dataView.RowFilter = "Year = 2008" // integer value dataView.RowFilter = String.Format(CultureInfo.InvariantCulture.NumberFormat, Date values are enclosed within sharp characters # #. The date format is the same as is the result of DateTime.ToString() method for invariant or English culture. [C#] dataView.RowFilter = "Date = #12/31/2008#" // date value (time is 00:00:00) dataView.RowFilter = String.Format(CultureInfo.InvariantCulture.DateTimeFormat, Alternatively you can enclose all values within single quotes ' '. It means you can use string values for numbers or date time values. In this case the current culture is used to convert the string to the specific value. [C#] dataView.RowFilter = "Date = '12/31/2008 16:44:58'" // if current culture is English dataView.RowFilter = "Price = '1199.90'" // if current culture is English Comparison operators Note: String comparison is culture-sensitive, it uses CultureInfo from DataTable.Locale property of related table (dataView.Table.Locale). If the property is not explicitly set, its default value is DataSet.Locale (and its default value is current system culture Thread.CurrentThread.CurrentCulture). [C#] dataView.RowFilter = "Num = 10" // number is equal to 10 Operator IN is used to include only values from the list. You can use the operator for all data types, such as numbers or strings. [C#] dataView.RowFilter = "Id IN (1, 2, 3)" // integer values dataView.RowFilter = "Id NOT IN (1, 2, 3)" // values not from the list Operator LIKE is used to include only values that match a pattern with wildcards. Wildcard character is * or %, it can be at the beginning of a pattern '*value', at the end 'value*', or at both '*value*'. Wildcard in the middle of a patern 'va*lue' is not allowed. [C#] dataView.RowFilter = "Name LIKE 'j*'" // values that start with 'j' dataView.RowFilter = "Name NOT LIKE 'j*'" // values that don't start with 'j' If a pattern in a LIKE clause contains any of these special characters * % [ ], those characters must be escaped in brackets [ ] like this [*], [%], [[] or []]. [C#] dataView.RowFilter = "Name LIKE '[*]*'" // values that starts with '*' The following method escapes a text value for usage in a LIKE clause. [C#] public static string EscapeLikeValue(string valueWithoutWildcards) [C#] // select all that starts with the value string (in this case with "*") Boolean operators [C#] // operator AND has precedence over OR operator, parenthesis are needed // following examples do the same Arithmetic and string operators [C#] dataView.RowFilter = "MotherAge - Age < 20"; // people with young mother There is also one string operator concatenation +. Parent-Child Relation Referencing The reference to the child column must be in an aggregate function because child relationships may return multiple rows. For example expression SUM(Child.Price) returns sum of all prices in child table related to the row in parent table. If a table has more than one child relation, the prefix must contain relation name. For example expression Child(OrdersToItemsRelation).Price references to column Price in child table using relation named OrdersToItemsRelation. Aggregate Functions This example shows aggregate function performed on a single table. [C#] // select people with above-average salary Following example shows aggregate functions performed on two tables which have parent-child relation. Suppose there are tables Orders and Items with the parent-child relation. [C#] // select orders which have more than 5 items // select orders which total price (sum of items prices) is greater or equal $500 Functions CONVERT – converts particular expression to a specified .NET Framework type |
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