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+# CRUD Technic Notes
+
+## Database Pipeline
+
+### Select
+
+1. Create select `what`, where clause, order clause, `Offset` and `Limit`.
+2. Check clauses' related columns are valid. Then generate sql string and param list.
+3. Convert param list to `Dapper` dynamic params. Execute sql and get `dynamic`s.
+4. Run hook `AfterSelect` for every column.
+5. Convert `dynamic`s to `TEntity`s.
+
+TODO: Continue here.
+
+### Insert
+
+1. Create insert clause consisting of insert items.
+2. Check clauses' related columns are valid. Then generate sql string and param list.
+3. Run hook `BeforeInsert` for every column.
+4. Convert param list to `Dapper` dynamic params. Execute sql and return `KeyColumn` value.
+
+### Update
+
+1. Create update clause consisting of update items, where clause.
+2. Check clauses' related columns are valid. Then generate sql string and param list.
+3. Run hook `BeforeUpdate` for every column.
+4. Convert param list to `Dapper` dynamic params. Execute sql and get count of affected rows.