public override SqlToken GenerateSqlToken(InsertCommandContext sqlCommandContext)
{
var result = FindPreviousSqlToken();
ShardingAssert.ShouldBeNotNull(result, "not find PreviousSqlToken");
var generatedKey = sqlCommandContext.GetGeneratedKeyContext();
ShardingAssert.ShouldBeNotNull(generatedKey, "generatedKey is required");
var generatedValues = generatedKey.GetGeneratedValues().Reverse().GetEnumerator();
int count = 0;
foreach (var insertValueContext in sqlCommandContext.GetInsertValueContexts())
{
var insertValueToken = result.InsertValues[count];
IDerivedSimpleExpressionSegment expressionSegment;
if (IsToAddDerivedLiteralExpression(sqlCommandContext, count))
{
expressionSegment = new DerivedLiteralExpressionSegment(generatedValues.Next());
}
else
{
expressionSegment = new DerivedParameterMarkerExpressionSegment(insertValueContext.GetParametersCount(), string.Empty);
}
insertValueToken.GetValues().Add(expressionSegment);
count++;
}
return(result);
}
public static object GetParameterValue(this List <object> parameters, ParameterMarkerExpressionSegment parameterMarkerExpressionSegment)
{
var parameter = parameters.Select(o => (DbParameter)o).FirstOrDefault(o => o.ParameterName.Equals(parameterMarkerExpressionSegment.GetParameterName()));
ShardingAssert.ShouldBeNotNull(parameter, $"Sharding value cant find parameter name :[{parameterMarkerExpressionSegment.GetParameterName()}].");
return(parameter.Value);
}
public override void RemoveAt(string parameterName)
{
ShardingAssert.ShouldBeNotNull(parameterName, nameof(parameterName));
var indexOf = IndexOf(parameterName);
RemoveAt(indexOf);
}
private AggregationDistinctToken GenerateSQLToken(AggregationDistinctProjection projection)
{
ShardingAssert.ShouldBeNotNull(projection.GetAlias(), "alias is required");
String derivedAlias = DerivedColumn.IsDerivedColumnName(projection.GetAlias()) ? projection.GetAlias() : null;
return(new AggregationDistinctToken(projection.StartIndex, projection.StopIndex, projection.GetDistinctInnerExpression(), derivedAlias));
}
public override void Remove(object value)
{
ShardingAssert.ShouldBeNotNull(value, nameof(value));
var parameter = CheckValue(value);
RemoveAt(IndexOf(parameter));
}
public ComplexShardingStrategyConfiguration(string shardingColumns, IComplexKeysShardingAlgorithm <IComparable> shardingAlgorithm)
{
ShardingAssert.If(string.IsNullOrWhiteSpace(shardingColumns), "ShardingColumns is required.");
ShardingAssert.ShouldBeNotNull(shardingAlgorithm, "ShardingAlgorithm is required.");
this.ShardingColumns = shardingColumns;
this.ShardingAlgorithm = shardingAlgorithm;
}
public override int Add(object value)
{
ShardingAssert.ShouldBeNotNull(value, nameof(value));
var parameter = CheckValue(value);
parameter.ShardingParameters = this;
bool hasName = false;
var nameIsEmpty = string.IsNullOrEmpty(parameter.ParameterName);
if (!nameIsEmpty)
{
hasName = _nameToIndex.TryGetValue(parameter.ParameterName, out var nameIndex);
if (hasName && nameIndex != -1)
{
throw new ShardingException($"Parameter '{parameter.ParameterName}' has already been defined.");
}
}
if (!hasName)
{
if (!nameIsEmpty)
{
_nameToIndex.Add(parameter.ParameterName, _parameters.Count);
}
}
else
{
_nameToIndex[parameter.ParameterName] = _parameters.Count;
}
_parameters.Add(parameter);
return(_parameters.Count - 1);
}
public override SqlToken GenerateSqlToken(InsertCommandContext sqlCommandContext)
{
var insertColumnsSegment = sqlCommandContext.GetSqlCommand().InsertColumns;
ShardingAssert.ShouldBeNotNull(insertColumnsSegment, "insertColumnsSegment is required");
return(new UseDefaultInsertColumnsToken(insertColumnsSegment.GetStopIndex(), GetColumnNames(sqlCommandContext)));
}
public override bool Contains(object value)
{
ShardingAssert.ShouldBeNotNull(value, nameof(value));
var parameter = CheckValue(value);
return(_parameters.Contains(parameter));
}
private IComparable GetValue(ParameterMarkerExpressionSegment expressionSegment, ParameterContext parameterContext)
{
object result = parameterContext.GetParameterValue(expressionSegment.GetParameterName());
ShardingAssert.Else(result is IComparable, "Sharding value must implements IComparable.");
return((IComparable)result);
}
public override int IndexOf(object value)
{
ShardingAssert.ShouldBeNotNull(value, nameof(value));
var parameter = CheckValue(value);
return(_parameters.IndexOf(parameter));
}
private IComparable GetValue(LiteralExpressionSegment expressionSegment)
{
object result = expressionSegment.GetLiterals();
ShardingAssert.Else(result is IComparable, "Sharding value must implements IComparable.");
return((IComparable)result);
}
public RouteContext Decorate(RouteContext routeContext, ShardingConnectorMetaData metaData, ShardingRule shardingRule,
ConfigurationProperties properties)
{
var sqlStatementContext = routeContext.GetSqlCommandContext();
// var tableNames = sqlStatementContext.GetTablesContext().GetTableNames();
// if (!shardingRule.TableRules.Any(o => tableNames.Any(t => o.LogicTable.EqualsIgnoreCase(t))))
// {
// return routeContext;
// }
var parameters = routeContext.GetParameterContext();
ShardingCommandValidatorFactory.NewInstance(
sqlStatementContext.GetSqlCommand())
.IfPresent(validator => validator.Validate(shardingRule, sqlStatementContext.GetSqlCommand(), parameters));
ShardingConditions shardingConditions = GetShardingConditions(parameters, sqlStatementContext, metaData.Schema, shardingRule);
var needMergeShardingValues = IsNeedMergeShardingValues(sqlStatementContext, shardingRule);
if (needMergeShardingValues && sqlStatementContext.GetSqlCommand() is DMLCommand)
{
CheckSubQueryShardingValues(sqlStatementContext, shardingRule, shardingConditions);
MergeShardingConditions(shardingConditions);
}
var shardingRouteEngine = ShardingRouteEngineFactory.NewInstance(shardingRule, metaData, sqlStatementContext, shardingConditions, properties);
RouteResult routeResult = shardingRouteEngine.Route(shardingRule);
if (needMergeShardingValues)
{
ShardingAssert.Else(1 == routeResult.GetRouteUnits().Count, "Must have one sharding with sub query.");
}
return(new RouteContext(sqlStatementContext, parameters, routeResult));
}
private IComparable GetAggregationValue(IStreamDataReader streamDataReader, AggregationProjection aggregationProjection)
{
object result = streamDataReader.GetValue(aggregationProjection.GetIndex());
ShardingAssert.Else(null == result || result is IComparable, "Aggregation value must implements Comparable");
return((IComparable)result);
}
public override void Insert(int index, object value)
{
ShardingAssert.ShouldBeNotNull(value, nameof(value));
var parameter = CheckValue(value);
if (!string.IsNullOrEmpty(parameter.ParameterName))
{
if (_nameToIndex.TryGetValue(parameter.ParameterName, out var i))
{
throw new ShardingException($"Parameter '{parameter.ParameterName}' has already been defined.");
}
}
if (index < _parameters.Count)
{
//将所有nameToIndex在插入index后面的都后移一位
foreach (var pair in _nameToIndex)
{
if (pair.Value >= index)
{
_nameToIndex[pair.Key] = pair.Value + 1;
}
}
}
_parameters.Insert(index, parameter);
_nameToIndex.Add(parameter.ParameterName, index);
}
public SqlToken GenerateSqlToken(SelectCommandContext sqlCommandContext)
{
var pagination = sqlCommandContext.GetPaginationContext();
ShardingAssert.ShouldBeNotNull(pagination.GetOffsetSegment(), "offset segment is required");
return(new OffsetToken(pagination.GetOffsetSegment().GetStartIndex(), pagination.GetOffsetSegment().GetStopIndex(), pagination.GetRevisedOffset()));
}
public StandardShardingStrategy(StandardShardingStrategyConfiguration standardShardingStrategyConfig)
{
ShardingAssert.ShouldBeNotNull(standardShardingStrategyConfig.ShardingColumn, "Sharding column cannot be null.");
ShardingAssert.ShouldBeNotNull(standardShardingStrategyConfig.PreciseShardingAlgorithm, "Sharding precise sharding algorithm cannot be null.");
shardingColumn = standardShardingStrategyConfig.ShardingColumn;
preciseShardingAlgorithm = standardShardingStrategyConfig.PreciseShardingAlgorithm;
rangeShardingAlgorithm = standardShardingStrategyConfig.RangeShardingAlgorithm;
}
public StandardShardingStrategyConfiguration(string shardingColumn, IPreciseShardingAlgorithm <IComparable> preciseShardingAlgorithm, IRangeShardingAlgorithm <IComparable> rangeShardingAlgorithm)
{
ShardingAssert.If(string.IsNullOrWhiteSpace(shardingColumn), "ShardingColumns is required.");
ShardingAssert.ShouldBeNotNull(preciseShardingAlgorithm, "PreciseShardingAlgorithm is required.");
this.ShardingColumn = shardingColumn;
this.PreciseShardingAlgorithm = preciseShardingAlgorithm;
this.RangeShardingAlgorithm = rangeShardingAlgorithm;
}
public ComplexShardingStrategy(ComplexShardingStrategyConfiguration complexShardingStrategyConfig)
{
ShardingAssert.ShouldBeNotNull(complexShardingStrategyConfig.ShardingColumns, "Sharding columns cannot be null.");
ShardingAssert.ShouldBeNotNull(complexShardingStrategyConfig.ShardingAlgorithm, "Sharding algorithm cannot be null.");
shardingColumns = new SortedSet <string>(StringComparer.OrdinalIgnoreCase);
shardingColumns.AddAll(complexShardingStrategyConfig.ShardingColumns.Split(new [] { ',' }, StringSplitOptions.RemoveEmptyEntries));
shardingAlgorithm = complexShardingStrategyConfig.ShardingAlgorithm;
}
/**
* Get a new instance for {@code HintManager}.
*
* @return {@code HintManager} instance
*/
public static HintManager GetInstance()
{
ShardingAssert.Else(null == HINT_MANAGER_HOLDER.Value, "Hint has previous value, please clear first.");
HintManager result = new HintManager();
HINT_MANAGER_HOLDER.Value = result;
return(result);
}
public override SqlToken GenerateSqlToken(InsertCommandContext sqlCommandContext)
{
var generatedKey = sqlCommandContext.GetGeneratedKeyContext();
ShardingAssert.ShouldBeNotNull(generatedKey, "generatedKey is required");
var sqlSegment = sqlCommandContext.GetSqlCommand().InsertColumns;
ShardingAssert.ShouldBeNotNull(sqlSegment, "sqlSegment is required");
return(new GeneratedKeyInsertColumnToken(sqlSegment.GetStopIndex(), generatedKey.GetColumnName()));
}
private List <String> GetColumnNames(InsertCommandContext insertCommandContext)
{
var generatedKey = insertCommandContext.GetGeneratedKeyContext();
ShardingAssert.ShouldBeNotNull(generatedKey, "generatedKey is required");
List <String> result = new List <string>(insertCommandContext.GetColumnNames());
result.Remove(generatedKey.GetColumnName());
result.Add(generatedKey.GetColumnName());
return(result);
}
private ICollection <string> RouteDataSources(ShardingRule shardingRule, TableRule tableRule, List <IRouteValue> databaseShardingValues)
{
if (databaseShardingValues.IsEmpty())
{
return(tableRule.GetActualDatasourceNames());
}
ICollection <string> result = new HashSet <string>(shardingRule.GetDatabaseShardingStrategy(tableRule).DoSharding(tableRule.GetActualDatasourceNames(), databaseShardingValues, this.Properties));
ShardingAssert.If(result.IsEmpty(), "no database route info");
ShardingAssert.Else(tableRule.GetActualDatasourceNames().All(o => result.Contains(o)), $"Some routed data sources do not belong to configured data sources. routed data sources: `{result}`, configured data sources: `{tableRule.GetActualDatasourceNames()}`");
return(result);
}
private ICollection <string> GetTableNamesFromMetaData(DropIndexCommand dropIndexCommand)
{
ICollection <string> result = new LinkedList <string>();
foreach (var index in dropIndexCommand.Indexes)
{
var tableName = FindLogicTableNameFromMetaData(index.Identifier.GetValue());
ShardingAssert.ShouldBeNotNull(tableName, $"Cannot find index name `{index.Identifier.GetValue()}`.");
result.Add(tableName);
}
return(result);
}
private List <IComparable> GetOrderValues()
{
var result = new List <IComparable>(orderByItems.Count);
foreach (var orderByItem in orderByItems)
{
var value = _streamDataReader.GetValue(orderByItem.GetIndex());
ShardingAssert.If(value == null || !(value is IComparable), "Order by value must implements Comparable");
result.Add((IComparable)value);
}
return(result);
}
public override SqlToken GenerateSqlToken(InsertCommandContext sqlCommandContext)
{
var generatedKey = sqlCommandContext.GetGeneratedKeyContext();
ShardingAssert.ShouldBeNotNull(generatedKey, "generatedKey is required");
ShardingAssert.ShouldBeNotNull(sqlCommandContext.GetSqlCommand().SetAssignment, "setAssignment is required");
int startIndex = sqlCommandContext.GetSqlCommand().SetAssignment.GetStopIndex() + 1;
if (_parameterContext.IsEmpty())
{
return(new LiteralGeneratedKeyAssignmentToken(startIndex, generatedKey.GetColumnName(), generatedKey.GetGeneratedValues().LastOrDefault()));
}
return(new ParameterMarkerGeneratedKeyAssignmentToken(startIndex, generatedKey.GetColumnName()));
}
private ICollection <DataNode> RouteTables(ShardingRule shardingRule, TableRule tableRule, string routedDataSource, List <IRouteValue> tableShardingValues)
{
ICollection <string> availableTargetTables = tableRule.GetActualTableNames(routedDataSource);
ICollection <string> routedTables = new HashSet <string>(tableShardingValues.IsEmpty() ? availableTargetTables
: shardingRule.GetTableShardingStrategy(tableRule).DoSharding(availableTargetTables, tableShardingValues, this.Properties));
ShardingAssert.If(routedTables.IsEmpty(), "no table route info");
ICollection <DataNode> result = new LinkedList <DataNode>();
foreach (var routedTable in routedTables)
{
result.Add(new DataNode(routedDataSource, routedTable));
}
return(result);
}
private IComparable GetRouteValue(ISimpleExpressionSegment expressionSegment, ParameterContext parameterContext)
{
object result;
if (expressionSegment is ParameterMarkerExpressionSegment parameterMarkerExpressionSegment)
{
result = parameterContext.GetParameterValue(parameterMarkerExpressionSegment.GetParameterName());
}
else
{
result = ((LiteralExpressionSegment)expressionSegment).GetLiterals();
}
ShardingAssert.Else(result is IComparable, "Sharding value must implements IComparable.");
return((IComparable)result);
}
private void CheckSubQueryShardingValues(ISqlCommandContext <ISqlCommand> sqlStatementContext, ShardingRule shardingRule, ShardingConditions shardingConditions)
{
foreach (var tableName in sqlStatementContext.GetTablesContext().GetTableNames())
{
var tableRule = shardingRule.FindTableRule(tableName);
if (tableRule != null && IsRoutingByHint(shardingRule, tableRule) &&
HintManager.GetDatabaseShardingValues(tableName).Any() && HintManager.GetTableShardingValues(tableName).Any())
{
return;
}
}
ShardingAssert.If(shardingConditions.Conditions.IsEmpty(), "Must have sharding column with subquery.");
if (shardingConditions.Conditions.Count > 1)
{
ShardingAssert.Else(IsSameShardingCondition(shardingRule, shardingConditions), "Sharding value must same with subquery.");
}
}
private int Compare(MemoryQueryResultRow o1, MemoryQueryResultRow o2, ICollection <OrderByItem> orderByItems)
{
foreach (var orderByItem in orderByItems)
{
Object orderValue1 = o1.GetCell(orderByItem.GetIndex());
ShardingAssert.Else(null == orderValue1 || orderValue1 is IComparable, "Order by value must implements Comparable");
Object orderValue2 = o2.GetCell(orderByItem.GetIndex());
ShardingAssert.Else(null == orderValue2 || orderValue2 is IComparable, "Order by value must implements Comparable");
int result = CompareUtil.CompareTo((IComparable)orderValue1, (IComparable)orderValue2, orderByItem.GetSegment().GetOrderDirection(),
orderByItem.GetSegment().GetNullOrderDirection(), valueCaseSensitive[orderByItem.GetIndex()]);
if (0 != result)
{
return(result);
}
}
return(0);
}
