Npgsqldatareader example. C# PostgreSQL version Aug 15, 2018 · Why does NpgsqlDataReader consume the entire data set when Closing/Disposing? #2111 Read mappings The following shows the mappings used when reading values. Here’s an example of how to execute a SELECT query and read data using NpgsqlDataReader: Jun 30, 2022 · If for example I have this query: SELECT (column1, column2, column3) FROM table And I ran ExecuteReader(). C# (CSharp) NpgsqlDataReader. Using NpgsqlDataReader to Retrieve Data The NpgsqlDataReader class is used to retrieve results from a SELECT query. If column1 and column3 are strings and column 2 is an Id which are integers. We will operate on a single table that stores info for my board game collection. If we need more extensive processing of data, or we want to bind a Winforms control to a database table, the DataSet is preferred. Jan 3, 2015 · you should use reader when you have rows to control, executeScalar to take the first value of the first column of the query, executenonquery for operations like Insert, delete. To query a Postgres database, I’ve created a simple . Quite often a result set contains just a single row and column, for example, when you obtain the result of SELECT COUNT (*) FROM … or last generated ID using SELECT LASTVAL (); Feb 6, 2023 · The main advantage of Dapper is the auto-mapping in read operations. way qz4dugk 8dbeqdhr 2ph5b egx kxx dt1bq wc fszqghn od388