#Data annotations composite key code

Sequences and triggers may be created in Oracle Database 11 g Release 2 and earlier databases to support identity columns.įor objects which directly relate to a client application object, namely, a table which represents an application class and a table column which represents a class property, the object names used are those provided by the client. Note: There is no Data Annotation equivalent for HasPrecision. Indicates the precision and scale for a decimal property. Note: There is no Data Annotation equivalent for IsUnicode.

Indicates to create the column as an N-type, that is, nvarchar2 or nclob. Use the TypeName property with the Column Data Annotation to specify the type. For example a Date property is not legal to map to a number column. Indicates the provider-specific type to use for the database column. Indicates to create the column as a rowversion column. Use of a LOB column in the concurrency check will result in an ORA-00932: inconsistent datatypes error. Note: Do not use with an unbounded (no maximum length specified) string property as this will create a LOB column. Indicates the column should be used for optimistic concurrency checking. Indicates the property is not mapped to a database column. Specifies the maximum length of the property.

#Data annotations composite key code

Table 4-26 Mapping of Data Annotations and the Code First Fluent APIs Data Annotation Set Column Type to UROWID using HasColumnType() fluent API or Column data annotation Set Column Type to ROWID using HasColumnType() fluent API or Column data annotation Note: The long data type is deprecated and not recommended. Set Column Type to LONG using HasColumnType() fluent API or Column data annotation Set Max Length to <= 2000 using HasMaxLength() fluent API or MaxLength annotation and Set Column Type to CHAR using HasColumnType() fluent API or Column data annotation

Set Max Length to <= 1000 using HasMaxLength() fluent API or MaxLength annotation and Set Column Type to NCHAR using HasColumnType() fluent API or Column data annotation Set Max Length to <= 4000 using HasMaxLength() fluent API or MaxLength data annotation and set Unicode to false using IsUnicode() fluent API Set Max Length to <= 2000 using HasMaxLength() fluent API or MaxLength data annotation Set Unicode to false using IsUnicode() fluent API Reference the EDM Mapping sections in the documentation for additional information. Note: The default mapping of integer types may be specified in the EDM Mapping configuration. Note: Requires use of EDM Mapping configuration. Usually the performance issue occurs on whenever I use First method without primary keys.Table 4-25 Mapping of. How can I resolve this problem? In addition to this I will be glad if you share your experiences improving the search performance on Entity framework. I think the problem is because the navigation property on NotificationMessageDevice is not able to recognize what the primary key is on Device table. Relationship constraint must be identical : The number of properties in the Dependent and Principal Roles in a

NotificationMessageDevice_Device_Target_NotificationMessageDevice_Device_Source: What the problem is that whenever I want to make ID, UDID, ApplicationKey and PlatformKey define as a Composite Key with modelBuilder it gives the following error.

Assume that I have 3 classes public class Device) The performance issue occurs on 200k data table whenever I search an entity without primary key (i.e a string of GUID). Shortly, I want to create composite keys on my table remaining with the primary key in order to improve sql server search performance.