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AdoAdapterQueryRunner.cs
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211 lines (190 loc) · 10.4 KB
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namespace Simple.Data.Ado
{
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
internal class AdoAdapterQueryRunner
{
private readonly AdoAdapter _adapter;
public AdoAdapterQueryRunner(AdoAdapter adapter)
{
_adapter = adapter;
}
public IEnumerable<IDictionary<string, object>> RunQuery(SimpleQuery query,
out IEnumerable<SimpleQueryClauseBase>
unhandledClauses)
{
IEnumerable<IDictionary<string, object>> result;
if (query.Clauses.OfType<WithCountClause>().Any()) return RunQueryWithCount(query, out unhandledClauses);
ICommandBuilder[] commandBuilders = GetQueryCommandBuilders(query, out unhandledClauses);
IDbConnection connection = _adapter.CreateConnection();
if (_adapter.ProviderSupportsCompoundStatements || commandBuilders.Length == 1)
{
result =
CommandBuilder.CreateCommand(
_adapter.ProviderHelper.GetCustomProvider<IDbParameterFactory>(_adapter.SchemaProvider),
commandBuilders,
connection).ToEnumerable(_adapter.CreateConnection);
}
else
{
result = commandBuilders.SelectMany(cb => cb.GetCommand(connection).ToEnumerable(_adapter.CreateConnection));
}
if (query.Clauses.OfType<WithClause>().Any())
{
result = new EagerLoadingEnumerable(result);
}
return result;
}
public IObservable<IDictionary<string, object>> RunQueryAsObservable(SimpleQuery query,
out
IEnumerable
<SimpleQueryClauseBase>
unhandledClauses)
{
IDbConnection connection = _adapter.CreateConnection();
return new QueryBuilder(_adapter).Build(query, out unhandledClauses)
.GetCommand(connection)
.ToObservable(connection, _adapter);
}
private IEnumerable<IDictionary<string, object>> RunQueryWithCount(SimpleQuery query,
out IEnumerable<SimpleQueryClauseBase>
unhandledClauses)
{
WithCountClause withCountClause;
try
{
withCountClause = query.Clauses.OfType<WithCountClause>().First();
}
catch (InvalidOperationException)
{
// Rethrow with meaning.
throw new InvalidOperationException("No WithCountClause specified.");
}
query = query.ClearWithTotalCount();
var countQuery = query.ClearSkip()
.ClearTake()
.ClearOrderBy()
.ClearWith()
.ReplaceSelect(new CountSpecialReference());
var unhandledClausesList = new List<IEnumerable<SimpleQueryClauseBase>>
{
Enumerable.Empty<SimpleQueryClauseBase>(),
Enumerable.Empty<SimpleQueryClauseBase>()
};
using (var enumerator = RunQueries(new[] {countQuery, query}, unhandledClausesList).GetEnumerator())
{
unhandledClauses = unhandledClausesList[1];
if (!enumerator.MoveNext())
{
throw new InvalidOperationException();
}
IDictionary<string, object> countRow = enumerator.Current.Single();
withCountClause.SetCount((int) countRow.First().Value);
if (!enumerator.MoveNext())
{
throw new InvalidOperationException();
}
return enumerator.Current;
}
}
private ICommandBuilder[] GetPagedQueryCommandBuilders(SimpleQuery query,
out IEnumerable<SimpleQueryClauseBase> unhandledClauses)
{
return GetPagedQueryCommandBuilders(query, -1, out unhandledClauses);
}
private ICommandBuilder[] GetPagedQueryCommandBuilders(SimpleQuery query, Int32 bulkIndex,
out IEnumerable<SimpleQueryClauseBase> unhandledClauses)
{
var commandBuilders = new List<ICommandBuilder>();
var unhandledClausesList = new List<SimpleQueryClauseBase>();
unhandledClauses = unhandledClausesList;
IEnumerable<SimpleQueryClauseBase> unhandledClausesForPagedQuery;
ICommandBuilder mainCommandBuilder = new QueryBuilder(_adapter, bulkIndex).Build(query,
out
unhandledClausesForPagedQuery);
unhandledClausesList.AddRange(unhandledClausesForPagedQuery);
const int maxInt = 2147483646;
SkipClause skipClause = query.Clauses.OfType<SkipClause>().FirstOrDefault() ?? new SkipClause(0);
TakeClause takeClause = query.Clauses.OfType<TakeClause>().FirstOrDefault() ?? new TakeClause(maxInt);
if (skipClause.Count != 0 || takeClause.Count != maxInt)
{
var queryPager = _adapter.ProviderHelper.GetCustomProvider<IQueryPager>(_adapter.ConnectionProvider);
if (queryPager == null)
{
unhandledClausesList.AddRange(query.OfType<SkipClause>());
unhandledClausesList.AddRange(query.OfType<TakeClause>());
var commandBuilder = new CommandBuilder(mainCommandBuilder.Text, _adapter.GetSchema(),
mainCommandBuilder.Parameters);
commandBuilders.Add(commandBuilder);
}
else
{
IEnumerable<string> commandTexts = queryPager.ApplyPaging(mainCommandBuilder.Text, skipClause.Count,
takeClause.Count);
commandBuilders.AddRange(
commandTexts.Select(
commandText =>
new CommandBuilder(commandText, _adapter.GetSchema(), mainCommandBuilder.Parameters)));
}
}
return commandBuilders.ToArray();
}
private ICommandBuilder[] GetQueryCommandBuilders(SimpleQuery query,
out IEnumerable<SimpleQueryClauseBase> unhandledClauses)
{
if (query.Clauses.OfType<TakeClause>().Any() || query.Clauses.OfType<SkipClause>().Any())
{
return GetPagedQueryCommandBuilders(query, out unhandledClauses);
}
return new[] {new QueryBuilder(_adapter).Build(query, out unhandledClauses)};
}
private IEnumerable<ICommandBuilder> GetQueryCommandBuilders(SimpleQuery query, Int32 bulkIndex,
out IEnumerable<SimpleQueryClauseBase>
unhandledClauses)
{
if (query.Clauses.OfType<TakeClause>().Any() || query.Clauses.OfType<SkipClause>().Any())
{
return GetPagedQueryCommandBuilders(query, bulkIndex, out unhandledClauses);
}
return new[] {new QueryBuilder(_adapter, bulkIndex).Build(query, out unhandledClauses)};
}
public IEnumerable<IEnumerable<IDictionary<string, object>>> RunQueries(SimpleQuery[] queries,
List
<
IEnumerable
<SimpleQueryClauseBase>>
unhandledClauses)
{
if (_adapter.ProviderSupportsCompoundStatements && queries.Length > 1)
{
var commandBuilders = new List<ICommandBuilder>();
for (int i = 0; i < queries.Length; i++)
{
IEnumerable<SimpleQueryClauseBase> unhandledClausesForThisQuery;
commandBuilders.AddRange(GetQueryCommandBuilders(queries[i], i, out unhandledClausesForThisQuery));
unhandledClauses.Add(unhandledClausesForThisQuery);
}
IDbConnection connection = _adapter.CreateConnection();
IDbCommand command =
CommandBuilder.CreateCommand(
_adapter.ProviderHelper.GetCustomProvider<IDbParameterFactory>(_adapter.SchemaProvider),
commandBuilders.ToArray(), connection);
foreach (var item in command.ToEnumerables(connection))
{
yield return item.ToList();
}
}
else
{
foreach (SimpleQuery t in queries)
{
IEnumerable<SimpleQueryClauseBase> unhandledClausesForThisQuery;
yield return RunQuery(t, out unhandledClausesForThisQuery);
unhandledClauses.Add(unhandledClausesForThisQuery);
}
}
}
}
}