1# OH_Predicates 2 3 4## Overview 5 6Defines the predicates used for RDB stores. 7 8**Since** 9 1010 11 12**Related Modules** 13 14[RDB](_r_d_b.md) 15 16 17## Summary 18 19 20### Member Variables 21 22| Name| Description| 23| -------- | -------- | 24| [id](_r_d_b.md#id-14) | Unique identifier of the **OH_Predicates** struct.| 25| [equalTo](_r_d_b.md#equalto) | Pointer to the function used to set a predicates object to match the field whose value is equal to the specified value.| 26| [notEqualTo](_r_d_b.md#notequalto) | Pointer to the function used to set a predicates object to match the field whose value is not equal to the specified value.| 27| [beginWrap](_r_d_b.md#beginwrap) | Pointer to the function used to add a left parenthesis to the predicates.| 28| [endWrap](_r_d_b.md#endwrap) | Pointer to the function used to add a right parenthesis to the predicates.| 29| [orOperate](_r_d_b.md#oroperate) | Pointer to the function used to add the OR operator to the predicates.| 30| [andOperate](_r_d_b.md#andoperate) | Pointer to the function used to add the AND operator to the predicates.| 31| [isNull](_r_d_b.md#isnull-22) | Pointer to the function used to set a predicates object to match the field whose value is null.| 32| [isNotNull](_r_d_b.md#isnotnull) | Pointer to the function used to set a predicates object to match the field whose value is not null.| 33| [like](_r_d_b.md#like) | Pointer to the function used to set a predicates object to match a string that is similar to the specified value.| 34| [between](_r_d_b.md#between) | Pointer to the function used to set a predicates object to match the field whose value is within the specified range.| 35| [notBetween](_r_d_b.md#notbetween) | Pointer to the function used to set a predicates object to match the field whose value is out of the specified range.| 36| [greaterThan](_r_d_b.md#greaterthan) | Pointer to the function used to set a predicates object to match the field with value greater than the specified value.| 37| [lessThan](_r_d_b.md#lessthan) | Pointer to the function used to set a predicates object to match the field with value less than the specified value.| 38| [greaterThanOrEqualTo](_r_d_b.md#greaterthanorequalto) | Pointer to the function used to set a predicates object to match the field with value greater than or equal to the specified value.| 39| [lessThanOrEqualTo](_r_d_b.md#lessthanorequalto) | Pointer to the function used to set a predicates object to match the field with value less than or equal to the specified value.| 40| [orderBy](_r_d_b.md#orderby) | Pointer to the function used to set a predicates object to sort the values in a column in ascending or descending order.| 41| [distinct](_r_d_b.md#distinct) | Pointer to the function used to set a predicates object to filter out duplicate records.| 42| [limit](_r_d_b.md#limit) | Pointer to the function used to set a predicates object to specify the maximum number of records.| 43| [offset](_r_d_b.md#offset) | Pointer to the function used to set a predicates object to specify the start position of the returned result.| 44| [groupBy](_r_d_b.md#groupby) | Pointer to the function used to set a predicates object to group rows that have the same value into summary rows.| 45| [in](_r_d_b.md#in) | Pointer to the function used to set a predicates object to match the field with the value within the specified range.| 46| [notIn](_r_d_b.md#notin) | Pointer to the function used to set a predicates object to match the field with the value out of the specified range.| 47| [clear](_r_d_b.md#clear-12) | Pointer to the function used to clear a predicates instance.| 48| [destroy](_r_d_b.md#destroy-24) | Destroys an **OH_Predicates** object and reclaims the memory occupied.| 49