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PM> Install-Package DuckDB.NET.Datausing (var duckDBConnection = new DuckDBConnection("Data Source=file.db")) { duckDBConnection.Open(); var command = duckDBConnection.CreateCommand(); command.CommandText = "CREATE TABLE integers(foo INTEGER, bar INTEGER);"; var executeNonQuery = command.ExecuteNonQuery(); command.CommandText = "INSERT INTO integers VALUES (3, 4), (5, 6), (7, 8);"; executeNonQuery = command.ExecuteNonQuery(); command.CommandText = "Select count(*) from integers"; var executeScalar = command.ExecuteScalar(); command.CommandText = "SELECT foo, bar FROM integers"; var reader = command.ExecuteReader(); PrintQueryResults(reader); } private static void PrintQueryResults(DbDataReader queryResult) { for (var index = 0; index < queryResult.FieldCount; index++) { var column = queryResult.GetName(index); Console.Write($"{column} "); } Console.WriteLine(); while (queryResult.Read()) { for (int ordinal = 0; ordinal < queryResult.FieldCount; ordinal++) { var val = queryResult.GetInt32(ordinal); Console.Write(val); Console.Write(" "); } Console.WriteLine(); } }Week 12 Studies Weekly For in-memory database use Data Source=:memory: connection string. Board Game Cards Inspo
PM> Install-Package DuckDB.NET.Bindingsvar result = DuckDBOpen(null, out var database); using (database) { result = DuckDBConnect(database, out var connection); using (connection) { result = DuckDBQuery(connection, "CREATE TABLE integers(foo INTEGER, bar INTEGER);", out var queryResult); result = DuckDBQuery(connection, "INSERT INTO integers VALUES (3, 4), (5, 6), (7, 8);", out queryResult); result = DuckDBQuery(connection, "SELECT foo, bar FROM integers", out queryResult); PrintQueryResults(queryResult); result = DuckDBPrepare(connection, "INSERT INTO integers VALUES (?, ?)", out var insertStatement); using (insertStatement) { result = DuckDBBindInt32(insertStatement, 1, 42); // the parameter index starts counting at 1! result = DuckDBBindInt32(insertStatement, 2, 43); result = DuckDBExecutePrepared(insertStatement, out var _); } result = DuckDBPrepare(connection, "SELECT * FROM integers WHERE foo = ?", out var selectStatement); using (selectStatement) { result = DuckDBBindInt32(selectStatement, 1, 42); result = DuckDBExecutePrepared(selectStatement, out queryResult); } PrintQueryResults(queryResult); // clean up DuckDBDestroyResult(out queryResult); } } private static void PrintQueryResults(DuckDBResult queryResult) { for (var index = 0; index < queryResult.Columns.Count; index++) { var column = queryResult.Columns[index]; Console.Write($"{column.Name} "); } Console.WriteLine(); for (long row = 0; row < queryResult.RowCount; row++) { for (long column = 0; column < queryResult.ColumnCount; column++) { var val = DuckDBValueInt32(queryResult, column, row); Console.Write(val); Console.Write(" "); } Console.WriteLine(); } }