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using System;
using System.Data.Common;
using System.Threading;
using System.Threading.Tasks;
using DataKit.SQL.QueryExpressions;
namespace DataKit.SQL.Providers
{
public abstract class QueryProviderBase : IQueryProvider, IQueryProviderCommon
{
protected abstract QueryWriter CreateQueryWriter();
protected virtual (string Sql, ParameterBag parameters) ConvertQuery(QueryExpression queryExpression)
{
var converter = new QueryConverter();
var writer = CreateQueryWriter();
converter.WriteQuery(writer, queryExpression);
return (writer.ToString(), writer.Parameters);
}
protected abstract IConnectionLease OpenConnection();
protected abstract Task<IConnectionLease> OpenConnectionAsync(CancellationToken cancellationToken);
protected virtual DbCommand CreateCommand(DbConnection dbConnection, string sql, ParameterBag parameters)
{
var command = dbConnection.CreateCommand();
command.CommandText = sql;
if (parameters != null)
{
foreach (var kvp in parameters)
{
var parameter = command.CreateParameter();
parameter.ParameterName = $"@{kvp.Key}";
parameter.Value = kvp.Value ?? DBNull.Value;
command.Parameters.Add(parameter);
}
}
return command;
}
public int ExecuteNonQuery(ExecutableQueryExpression query, ParameterBag parameters = null)
{
var (sql, autoParameters) = ConvertQuery(query);
using (var lease = OpenConnection())
using (var command = CreateCommand(lease.Connection, sql, ParameterBag.Combine(autoParameters, parameters)))
{
return command.ExecuteNonQuery();
}
}
public async Task<int> ExecuteNonQueryAsync(ExecutableQueryExpression query, ParameterBag parameters = null, CancellationToken cancellationToken = default)
{
var (sql, autoParameters) = ConvertQuery(query);
using (var lease = await OpenConnectionAsync(cancellationToken))
using (var command = CreateCommand(lease.Connection, sql, ParameterBag.Combine(autoParameters, parameters)))
{
return await command.ExecuteNonQueryAsync(cancellationToken);
}
}
public virtual QueryResult ExecuteReader(ExecutableQueryExpression query, ParameterBag parameters = null)
{
var (sql, autoParameters) = ConvertQuery(query);
var lease = OpenConnection();
var command = CreateCommand(lease.Connection, sql, ParameterBag.Combine(autoParameters, parameters));
try
{
var reader = command.ExecuteReader();
return new QueryResult(command, reader, lease);
}
catch
{
command.Dispose();
lease.Dispose();
throw;
}
}
public virtual async Task<QueryResult> ExecuteReaderAsync(ExecutableQueryExpression query, ParameterBag parameters = null, CancellationToken cancellationToken = default)
{
var (sql, autoParameters) = ConvertQuery(query);
var lease = await OpenConnectionAsync(cancellationToken);
var command = CreateCommand(lease.Connection, sql, ParameterBag.Combine(autoParameters, parameters));
try
{
var reader = await command.ExecuteReaderAsync(cancellationToken);
return new QueryResult(command, reader, lease);
}
catch
{
command.Dispose();
lease.Dispose();
throw;
}
}
(string Sql, ParameterBag parameters) IQueryProviderCommon.ConvertQuery(QueryExpression queryExpression)
=> ConvertQuery(queryExpression);
DbCommand IQueryProviderCommon.CreateCommand(DbConnection dbConnection, string sql, ParameterBag parameters)
=> CreateCommand(dbConnection, sql, parameters);
}
}