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Utilisation ExecuteStatement avec un AWS SDK
Les exemples de code suivants illustrent comment utiliser ExecuteStatement.
Les exemples d’actions sont des extraits de code de programmes de plus grande envergure et doivent être exécutés en contexte. Vous pouvez voir cette action en contexte dans l’exemple de code suivant :
- AWS SDK for .NET
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Note
Il y en a plus sur GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’exemples de code AWS
. Utilisez une instruction INSERT pour ajouter un élément.
/// <summary> /// Inserts a single movie into the movies table. /// </summary> /// <param name="tableName">The name of the table.</param> /// <param name="movieTitle">The title of the movie to insert.</param> /// <param name="year">The year that the movie was released.</param> /// <returns>A Boolean value that indicates the success or failure of /// the INSERT operation.</returns> public static async Task<bool> InsertSingleMovie(string tableName, string movieTitle, int year) { string insertBatch = $"INSERT INTO {tableName} VALUE {{'title': ?, 'year': ?}}"; var response = await Client.ExecuteStatementAsync(new ExecuteStatementRequest { Statement = insertBatch, Parameters = new List<AttributeValue> { new AttributeValue { S = movieTitle }, new AttributeValue { N = year.ToString() }, }, }); return response.HttpStatusCode == System.Net.HttpStatusCode.OK; }Utilisez une instruction SELECT pour obtenir un élément.
/// <summary> /// Uses a PartiQL SELECT statement to retrieve a single movie from the /// movie database. /// </summary> /// <param name="tableName">The name of the movie table.</param> /// <param name="movieTitle">The title of the movie to retrieve.</param> /// <returns>A list of movie data. If no movie matches the supplied /// title, the list is empty.</returns> public static async Task<List<Dictionary<string, AttributeValue>>> GetSingleMovie(string tableName, string movieTitle) { string selectSingle = $"SELECT * FROM {tableName} WHERE title = ?"; var parameters = new List<AttributeValue> { new AttributeValue { S = movieTitle }, }; var response = await Client.ExecuteStatementAsync(new ExecuteStatementRequest { Statement = selectSingle, Parameters = parameters, }); return response.Items; }Utilisez une instruction SELECT pour obtenir une liste d'éléments.
/// <summary> /// Retrieve multiple movies by year using a SELECT statement. /// </summary> /// <param name="tableName">The name of the movie table.</param> /// <param name="year">The year the movies were released.</param> /// <returns></returns> public static async Task<List<Dictionary<string, AttributeValue>>> GetMovies(string tableName, int year) { string selectSingle = $"SELECT * FROM {tableName} WHERE year = ?"; var parameters = new List<AttributeValue> { new AttributeValue { N = year.ToString() }, }; var response = await Client.ExecuteStatementAsync(new ExecuteStatementRequest { Statement = selectSingle, Parameters = parameters, }); return response.Items; }Utilisez une instruction UPDATE pour mettre à jour un élément.
/// <summary> /// Updates a single movie in the table, adding information for the /// producer. /// </summary> /// <param name="tableName">the name of the table.</param> /// <param name="producer">The name of the producer.</param> /// <param name="movieTitle">The movie title.</param> /// <param name="year">The year the movie was released.</param> /// <returns>A Boolean value that indicates the success of the /// UPDATE operation.</returns> public static async Task<bool> UpdateSingleMovie(string tableName, string producer, string movieTitle, int year) { string insertSingle = $"UPDATE {tableName} SET Producer=? WHERE title = ? AND year = ?"; var response = await Client.ExecuteStatementAsync(new ExecuteStatementRequest { Statement = insertSingle, Parameters = new List<AttributeValue> { new AttributeValue { S = producer }, new AttributeValue { S = movieTitle }, new AttributeValue { N = year.ToString() }, }, }); return response.HttpStatusCode == System.Net.HttpStatusCode.OK; }Utilisez une instruction DELETE pour supprimer un seul film.
/// <summary> /// Deletes a single movie from the table. /// </summary> /// <param name="tableName">The name of the table.</param> /// <param name="movieTitle">The title of the movie to delete.</param> /// <param name="year">The year that the movie was released.</param> /// <returns>A Boolean value that indicates the success of the /// DELETE operation.</returns> public static async Task<bool> DeleteSingleMovie(string tableName, string movieTitle, int year) { var deleteSingle = $"DELETE FROM {tableName} WHERE title = ? AND year = ?"; var response = await Client.ExecuteStatementAsync(new ExecuteStatementRequest { Statement = deleteSingle, Parameters = new List<AttributeValue> { new AttributeValue { S = movieTitle }, new AttributeValue { N = year.ToString() }, }, }); return response.HttpStatusCode == System.Net.HttpStatusCode.OK; }-
Pour plus de détails sur l'API, reportez-vous ExecuteStatementà la section Référence des AWS SDK for .NET API.
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