using System; namespace ZeroLevel.SqlServer { public sealed class SqlDbForeignKeyInfo : IEquatable { public const string ForeignKeySelectQuery = "SELECT K_Table = FK.TABLE_NAME, FK_Column = CU.COLUMN_NAME, PK_Table = PK.TABLE_NAME, PK_Column = PT.COLUMN_NAME, Constraint_Name = C.CONSTRAINT_NAME FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS C INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS FK ON C.CONSTRAINT_NAME = FK.CONSTRAINT_NAME INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS PK ON C.UNIQUE_CONSTRAINT_NAME = PK.CONSTRAINT_NAME INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE CU ON C.CONSTRAINT_NAME = CU.CONSTRAINT_NAME INNER JOIN ( SELECT i1.TABLE_NAME, i2.COLUMN_NAME FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS i1 INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE i2 ON i1.CONSTRAINT_NAME = i2.CONSTRAINT_NAME WHERE i1.CONSTRAINT_TYPE = 'PRIMARY KEY' ) PT ON PT.TABLE_NAME = PK.TABLE_NAME"; public string ForeignKeyName; public string ForeignKeyTable; public string PrimaryKeyTable; public string ForeignKeyColumn; public string PrimaryKeyColumn; public bool Equals(SqlDbForeignKeyInfo other) { return String.Compare(ForeignKeyName, other.ForeignKeyName, StringComparison.OrdinalIgnoreCase) == 0 && String.Compare(ForeignKeyTable, other.ForeignKeyTable, StringComparison.OrdinalIgnoreCase) == 0 && String.Compare(PrimaryKeyTable, other.PrimaryKeyTable, StringComparison.OrdinalIgnoreCase) == 0 && String.Compare(ForeignKeyColumn, other.ForeignKeyColumn, StringComparison.OrdinalIgnoreCase) == 0 && String.Compare(PrimaryKeyColumn, other.PrimaryKeyColumn, StringComparison.OrdinalIgnoreCase) == 0; } public override int GetHashCode() { return ForeignKeyName.GetHashCode() ^ ForeignKeyTable.GetHashCode() ^ PrimaryKeyTable.GetHashCode() ^ ForeignKeyColumn.GetHashCode() ^ PrimaryKeyColumn.GetHashCode(); } } }