Filter types
ObTableFilterList: connects different filters.ObTableValueFilter: compares values.ObTableInFilter/ObTableNotInFilter: checks whether the selected column value is equal to any of the values in the collection.
ObTableFilterList
This filter connects different filters by using And or Or.
The syntax is as follows:
const (
OperatorAnd Operator = iota
OperatorOr
)
You can use a function to obtain a filter list connected by And or Or. The syntax is as follows:
func AndList(filters ...ObTableFilter) *ObTableFilterList {
return NewObTableFilterListWithOperatorAndTableFilter(OperatorAnd, filters...)
}
func OrList(filters ...ObTableFilter) *ObTableFilterList {
return NewObTableFilterListWithOperatorAndTableFilter(OperatorOr, filters...)
}
ObTableValueFilter
This filter is the most basic filter used to check whether the values of a column meet the specified conditions. The columns that meet the specified conditions are chosen.
The syntax is as follows:
const (
LessThan ObCompareOperator = iota
GreaterThan
LessOrEqualThan
GreaterOrEqualThan
NotEqual
Equal
IsNull
IsNotNull
)
func CompareVal(op ObCompareOperator, columnName string, value interface{}) *ObTableValueFilter {
return NewObTableValueFilter(op, columnName, value)
}
Input parameters:
op: defines the method for comparison between column names and values, which is contained in the value ofconst.columnName: the column name for comparison.value: the value to be compared with the column name.
ObTableInFilter/ObTableNotInFilter
The syntax is as follows:
func In(columnName string, values ...interface{}) *ObTableInFilter {
return NewObTableInFilter(columnName, values...)
}
func NotIn(columnName string, values ...interface{}) *ObTableNotInFilter {
return NewObTableNotInFilter(columnName, values...)
}
Input parameters:
columnName: the column name for comparison.values: the values to be compared with the column name.ObTableInFilterchecks whether the column name is equal to any of the values.ObTableNotInFilterchecks whether the column name is not equal to any of the values. The values of the column are not included invalues.
Example
// 4 < c1 < 6
c1lt6 := filter.CompareVal(filter.LessThan, "c1", int64(6))
c1gt4 := filter.CompareVal(filter.GreaterThan, "c1", int64(4))
c1filterList := filter.AndList(c1lt6, c1gt4)
// 0 >= c2 or c2 >= 2
c2le0 := filter.CompareVal(filter.LessOrEqualThan, "c2", int64(0))
c2ge2 := filter.CompareVal(filter.GreaterOrEqualThan, "c2", int64(2))
c2filterList := filter.orList(c2le0, c2ge2)
// (4 < c1 < 6 ) && (c2 <= 0) && (c2 >= 2)
finalFilter := filter.AndList(c1filterList, c2filterList)
