/// <summary>
/// 异步执行没有结果的查询
/// </summary>
/// <param name="query">要执行的查询对象</param>
/// <param name="token">取消指示</param>
/// <returns>查询所影响的行数</returns>
public static async Task <int> ExecuteNonQueryAsync(this IAsyncDbExecutableQuery query, CancellationToken token = default(CancellationToken))
{
using (var context = await query.ExecuteAsync(token))
{
return(context.RecordsAffected);
}
}
/// <summary>
/// 异步执行查询并将第一个结果集包装成 DataTable 返回
/// </summary>
/// <param name="query">要执行的查询对象</param>
/// <param name="token">取消指示</param>
/// <returns>查询结果</returns>
public static async Task <DataTable> ExecuteDataTableAsync(this IAsyncDbExecutableQuery query, CancellationToken token = default(CancellationToken))
{
using (var context = await query.ExecuteAsync(token))
{
return(await context.LoadDataTableAsync(0, 0, token));
}
}
/// <summary>
/// 异步执行查询并将所有结果集包装成 DataTable 返回
/// </summary>
/// <param name="query">要执行的查询对象</param>
/// <param name="token">取消指示</param>
/// <returns>查询结果</returns>
public static async Task <DataTable[]> ExecuteAllDataTablesAsync(this IAsyncDbExecutableQuery query, CancellationToken token = default(CancellationToken))
{
List <DataTable> dataTables = new List <DataTable>();
using (var context = await query.ExecuteAsync(token))
{
do
{
dataTables.Add(context.LoadDataTable(0, 0));
} while (await context.NextResultAsync());
}
return(dataTables.ToArray());
}
/// <summary>
/// 查询数据库并将第一个结果集填充实体类型
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="query">要执行的查询</param>
/// <param name="token">取消指示</param>
/// <param name="converter">实体转换器</param>
/// <returns>实体集</returns>
public async static Task <T[]> ExecuteEntitiesAsync <T>(this IAsyncDbExecutableQuery query, CancellationToken token, Func <DataRow, CancellationToken, Task <T> > converter)
{
var data = await query.ExecuteDataTableAsync(token);
List <T> result = new List <T>();
foreach (var dataItem in data.GetRows())
{
var entity = await converter(dataItem, token);
result.Add(entity);
}
return(result.ToArray());
}
/// <summary>
/// 异步执行查询并返回首行首列
/// </summary>
/// <param name="query">要执行的查询对象</param>
/// <param name="token">取消指示</param>
/// <returns>查询结果</returns>
public static async Task <object> ExecuteScalarAsync(this IAsyncDbExecutableQuery query, CancellationToken token = default(CancellationToken))
{
using (var context = await query.ExecuteAsync(token))
{
var record = await context.ReadRecordAsync();
if (record != null && record.FieldCount > 0)
{
return(record[0]);
}
else
{
return(null);
}
}
}
/// <summary>
/// 异步执行查询并返回首行
/// </summary>
/// <param name="query">要执行的查询对象</param>
/// <param name="token">取消指示</param>
/// <returns>查询结果</returns>
public static async Task <DataRow> ExecuteFirstRowAsync(this IAsyncDbExecutableQuery query, CancellationToken token = default(CancellationToken))
{
//UNDONE
using (var context = await query.ExecuteAsync(token))
{
var data = context.LoadDataTable(0, 1);
if (data.Rows.Count > 0)
{
return(data.Rows[0]);
}
else
{
return(null);
}
}
}
/// <summary>
/// 查询数据库并将结果首行填充实体
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="query">要执行的查询</param>
/// <param name="token">取消指示</param>
/// <param name="converter">实体转换方法</param>
/// <returns>实体</returns>
public async static Task <T> ExecuteEntityAsync <T>(this IAsyncDbExecutableQuery query, CancellationToken token, IEntityConverter <T> converter) where T : new()
{
var dataItem = await query.ExecuteFirstRowAsync(token);
return(dataItem.ToEntity <T>(converter));
}
/// <summary>
/// 查询数据库并将结果首行填充实体
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="query">要执行的查询</param>
/// <param name="token">取消指示</param>
/// <returns>实体</returns>
public async static Task <T> ExecuteEntityAsync <T>(this IAsyncDbExecutableQuery query, CancellationToken token = default(CancellationToken)) where T : new()
{
var dataItem = await query.ExecuteFirstRowAsync(token);
return(dataItem.ToEntity <T>());
}
/// <summary>
/// 查询数据库并将第一个结果集填充实体类型
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="query">要执行的查询</param>
/// <param name="token">取消指示</param>
/// <param name="converter">实体转换器</param>
/// <returns>实体集</returns>
public async static Task <T[]> ExecuteEntitiesAsync <T>(this IAsyncDbExecutableQuery query, CancellationToken token, Func <DataRow, T> converter)
{
var data = await query.ExecuteDataTableAsync(token);
return(data.GetRows().Select(dataItem => converter(dataItem)).ToArray());
}
/// <summary>
/// 异步执行查询并将第一个结果集的第一条记录填充动态对象
/// </summary>
/// <param name="query">要执行的查询</param>
/// <returns>查询结果</returns>
public static async Task <dynamic> ExecuteDynamicObjectAsync(this IAsyncDbExecutableQuery query)
{
var dataItem = await query.ExecuteFirstRowAsync();
return(ToDynamic(dataItem));
}
/// <summary>
/// 异步执行查询并将数据转换为 DataRowView 集合返回
/// </summary>
/// <param name="query">要执行的查询</param>
/// <returns>转换为 DataRowView 的数据集合</returns>
public async static Task <IEnumerable <DataRowView> > ExecuteDataRowViewsAsync(this IAsyncDbExecutableQuery query)
{
return((await query.ExecuteDataTableAsync()).GetRowViews());
}
/// <summary>
/// 查询数据库并将第一个结果集填充实体类型
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="query">要执行的查询</param>
/// <param name="converter">实体转换器</param>
/// <returns>实体集</returns>
public static Task <T[]> ExecuteEntitiesAsync <T>(this IAsyncDbExecutableQuery query, IEntityConverter <T> converter) where T : new()
{
return(ExecuteEntitiesAsync(query, CancellationToken.None, converter));
}
/// <summary>
/// 异步执行查询并返回首行首列
/// </summary>
/// <typeparam name="T">返回值类型</typeparam>
/// <param name="query">要执行的查询对象</param>
/// <param name="token">取消指示</param>
/// <returns>查询结果</returns>
public async static Task <T> ExecuteScalarAsync <T>(this IAsyncDbExecutableQuery query, CancellationToken token = default(CancellationToken))
{
return(DbValueConverter.ConvertFrom <T>(await ExecuteScalarAsync(query, token)));
}
/// <summary>
/// 异步执行查询并返回首行首列
/// </summary>
/// <typeparam name="T">返回值类型</typeparam>
/// <param name="query">要执行的查询对象</param>
/// <param name="token">取消指示</param>
/// <returns>查询结果</returns>
public async static Task <T> ExecuteScalarAsync <T>(this IAsyncDbExecutableQuery query, CancellationToken token = default(CancellationToken))
{
var scalar = await ExecuteScalarAsync(query, token);
return(scalar.ConvertTo <T>());
}
/// <summary>
/// 异步执行查询并将第一行数据数据转换为 DataRowView 返回
/// </summary>
/// <param name="query">要执行的查询</param>
/// <returns>转换为 DataRowView 的数据集合</returns>
public async static Task <DataRowView> ExecuteFirstDataRowViewAsync(this IAsyncDbExecutableQuery query)
{
return((await query.ExecuteDataTableAsync()).GetRowViews().FirstOrDefault());
}
/// <summary>
/// 异步查询数据库并将结果首行填充实体
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="query">要执行的查询</param>
/// <param name="converter">实体转换方法</param>
/// <returns>实体</returns>
public static Task <T> ExecuteEntityAsync <T>(this IAsyncDbExecutableQuery query, Func <DataRow, T> converter)
{
return(ExecuteEntityAsync(query, CancellationToken.None, converter));
}
/// <summary>
/// 异步查询数据库并将结果首行填充实体
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="query">要执行的查询</param>
/// <param name="token">取消指示</param>
/// <param name="converter">异步实体转换方法</param>
/// <returns>实体</returns>
public async static Task <T> ExecuteEntityAsync <T>(this IAsyncDbExecutableQuery query, CancellationToken token, Func <DataRow, CancellationToken, Task <T> > converter)
{
var dataItem = await query.ExecuteFirstRowAsync(token);
return(await converter(dataItem, token));
}
/// <summary>
/// 异步执行查询并将第一个结果集填充动态对象列表
/// </summary>
/// <param name="query">要执行的查询</param>
/// <param name="token">取消指示</param>
/// <returns>查询结果</returns>
public static async Task <dynamic[]> ExecuteDynamicsAsync(this IAsyncDbExecutableQuery query, CancellationToken token = default(CancellationToken))
{
var data = await query.ExecuteDataTableAsync(token);
return(ToDynamics(data));
}
/// <summary>
/// 查询数据库并将第一个结果集填充实体类型
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="query">要执行的查询</param>
/// <param name="token">取消指示</param>
/// <param name="converter">实体转换器</param>
/// <returns>实体集</returns>
public async static Task <T[]> ExecuteEntitiesAsync <T>(this IAsyncDbExecutableQuery query, CancellationToken token, IEntityConverter <T> converter) where T : new()
{
var data = await query.ExecuteDataTableAsync(token);
return(data.GetRows().Select(dataItem => dataItem.ToEntity <T>(converter)).ToArray());
}
/// <summary>
/// 异步执行查询并返回第一列数据
/// </summary>
/// <typeparam name="T">列类型</typeparam>
/// <param name="query">要执行的查询</param>
/// <returns>第一列的数据</returns>
public async static Task <T[]> ExecuteFirstColumnAsync <T>(this IAsyncDbExecutableQuery query)
{
return((await query.ExecuteDataTableAsync()).Column <T>());
}
