public void Invoke(WWhereClause node, MatchGraph graph, Dictionary<string, string> columnTableMapping)
{
_graph = graph;
_columnTableMapping = columnTableMapping;
if (node.SearchCondition != null)
node.SearchCondition.Accept(this);
}
public void Invoke(WWhereClause node, MatchGraph graph)
{
_graph = graph;
if (node.SearchCondition != null)
{
node.SearchCondition.Accept(this);
}
}
public void Invoke(WWhereClause node, MatchGraph graph, Dictionary <string, string> columnTableMapping)
{
_graph = graph;
_columnTableMapping = columnTableMapping;
if (node.SearchCondition != null)
{
node.SearchCondition.Accept(this);
}
}
public WWhereClause Invoke(WWhereClause node, MatchGraph graph, Dictionary <string, string> columnTableMapping)
{
_checkNodeEdgeReferenceVisitor = new CheckNodeEdgeReferenceVisitor(graph, columnTableMapping)
;
if (node.SearchCondition != null)
{
node.SearchCondition.Accept(this);
}
return(_nodeEdgePredicatesWhenClause);
}
public void UpdateWherClause(WWhereClause whereClause, WBooleanExpression node)
{
if (whereClause.SearchCondition == null)
{
whereClause.SearchCondition = node;
}
else
{
whereClause.SearchCondition = new WBooleanBinaryExpression
{
FirstExpr = whereClause.SearchCondition,
SecondExpr = node,
BooleanExpressionType = BooleanBinaryExpressionType.And
};
}
}
private void AttachPredicates(WWhereClause whereClause, MatchGraph graph)
{
// Attaches proper parts of the where clause into the Estimiation Query
var attachPredicateVisitor = new AttachWhereClauseVisitor();
var columnTableMapping = _context.GetColumnToAliasMapping(_graphMetaData.ColumnsOfNodeTables);
attachPredicateVisitor.Invoke(whereClause, graph, columnTableMapping);
}
public virtual void Visit(WWhereClause node)
{
node.AcceptChildren(this);
}
public WUpdateSpecification()
{
WhereClause = new WWhereClause();
}
public WDeleteSpecification()
{
WhereClause = new WWhereClause();
}
private void TranslateEdgeDelete(WDeleteEdgeSpecification node, List<WSqlStatement> res)
{
const string deleteEdgeTableName = "GraphView_DeleteEdgeInternalTable";
string deleteEdgeTempTable = "DeleteTmp_" + Path.GetRandomFileName().Replace(".", "").Substring(0, 8);
// Wraps the select statement in a common table expression
WTableReference sinkTable, sourceTable;
var deleteCommonTableExpr = ConstructDeleteEdgeSelect(node.SelectDeleteExpr,
node.EdgeColumn.Alias, deleteEdgeTempTable,
out sinkTable, out sourceTable);
var sourceNameTable = sourceTable as WNamedTableReference;
if (sourceNameTable == null)
throw new GraphViewException("Source table of DELETE EDGE statement should be a named table reference.");
var sinkNameTable = sinkTable as WNamedTableReference;
if (sinkNameTable == null)
throw new GraphViewException("Sink table of DELETE EDGE statement should be a named table reference.");
// Get edge select query and reversed edge select query
WSelectQueryBlock edgeSelectQuery = new WSelectQueryBlock
{
SelectElements = new List<WSelectElement>
{
new WSelectScalarExpression
{
SelectExpr = new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier {Value = "src"})
},
ColumnName = "source"
},
new WSelectScalarExpression
{
SelectExpr = new WFunctionCall
{
CallTarget = new WMultiPartIdentifierCallTarget
{
Identifiers = new WMultiPartIdentifier(new Identifier {Value = "dbo"})
},
FunctionName = new Identifier {Value = GraphViewConnection.GraphViewUdfAssemblyName + "EdgeIdEncoder"},
Parameters = new List<WScalarExpression>
{
new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier {Value = "edgeid"})
},
},
},
ColumnName = "binary1"
},
new WSelectScalarExpression
{
SelectExpr = new WFunctionCall
{
FunctionName = new Identifier{Value = "COUNT"},
Parameters = new List<WScalarExpression>
{
new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier {Value = "sink"})
},
},
},
ColumnName = "sinkCnt"
}
},
FromClause = new WFromClause
{
TableReferences = new List<WTableReference>
{
new WSpecialNamedTableReference
{
TableObjectName = new WSchemaObjectName(new Identifier{Value = deleteEdgeTempTable })
}
}
},
GroupByClause = new WGroupByClause
{
GroupingSpecifications = new List<WGroupingSpecification>
{
new WExpressionGroupingSpec
{
Expression = new WValueExpression("src",false)
}
}
}
};
WSelectQueryBlock reversedEdgeSelectQuery = new WSelectQueryBlock
{
SelectElements = new List<WSelectElement>
{
new WSelectScalarExpression
{
SelectExpr = new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier {Value = "sink"})
},
ColumnName = "source"
},
new WSelectScalarExpression
{
SelectExpr = new WFunctionCall
{
FunctionName =
new Identifier
{
Value = "COUNT"
},
Parameters = new List<WScalarExpression>
{
new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier {Value = "src"})
},
}
},
ColumnName = "srcCnt"
},
},
FromClause = edgeSelectQuery.FromClause,
GroupByClause = new WGroupByClause
{
GroupingSpecifications = new List<WGroupingSpecification>
{
new WExpressionGroupingSpec
{
Expression = new WValueExpression("sink", false)
}
}
}
};
//Check src & sink
string sourceTableName = sourceNameTable.TableObjectName.ToString();
string sinkTableName = sinkNameTable.TableObjectName.ToString();
int compare = string.CompareOrdinal(sourceTableName, sinkTableName);
WSetClause[] setClauses = new WSetClause[]
{
new WFunctionCallSetClause()
{
MutatorFuction = new WFunctionCall
{
CallTarget = new WMultiPartIdentifierCallTarget()
{
Identifiers =
new WMultiPartIdentifier(new Identifier
{
Value = node.EdgeColumn.MultiPartIdentifier.Identifiers.Last().Value + "DeleteCol"
})
},
FunctionName = new Identifier {Value = "WRITE"},
Parameters = new WScalarExpression[]
{
new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(
new Identifier {Value = deleteEdgeTableName},
new Identifier {Value = "binary1"})
},
new WValueExpression("null", false),
new WValueExpression("null", false)
}
}
},
new WAssignmentSetClause()
{
AssignmentKind = AssignmentKind.Equals,
Column = new WColumnReferenceExpression
{
MultiPartIdentifier =
new WMultiPartIdentifier(new Identifier
{
Value = "InDegree"
})
},
NewValue = new WBinaryExpression
{
FirstExpr = new WColumnReferenceExpression
{
MultiPartIdentifier =
new WMultiPartIdentifier(new Identifier
{
Value = "InDegree"
})
},
SecondExpr = new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier {Value = "srcCnt"})
},
ExpressionType = BinaryExpressionType.Subtract
}
},
new WAssignmentSetClause()
{
AssignmentKind = AssignmentKind.Equals,
Column = new WColumnReferenceExpression
{
MultiPartIdentifier =
new WMultiPartIdentifier(new Identifier
{
Value = node.EdgeColumn.MultiPartIdentifier.Identifiers.Last().Value + "OutDegree"
})
},
NewValue = new WBinaryExpression
{
FirstExpr = new WColumnReferenceExpression
{
MultiPartIdentifier =
new WMultiPartIdentifier(new Identifier
{
Value = node.EdgeColumn.MultiPartIdentifier.Identifiers.Last().Value + "OutDegree"
})
},
SecondExpr = new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier {Value = "sinkCnt"})
},
ExpressionType = BinaryExpressionType.Subtract
}
}
};
WWhereClause whereClause = new WWhereClause
{
SearchCondition = new WBooleanComparisonExpression
{
FirstExpr = new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier { Value = "GlobalNodeId" })
},
SecondExpr = new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(
new Identifier { Value = deleteEdgeTableName },
new Identifier { Value = "source" }
)
},
ComparisonType = BooleanComparisonType.Equals
}
};
if (compare == 0)
{
res.Add(new WDeclareTableVariable
{
VariableName = new Identifier { Value = "@" + deleteEdgeTempTable},
Definition = new WTableDefinition
{
ColumnDefinitions = new WColumnDefinition[]
{
new WColumnDefinition
{
ColumnIdentifier = new Identifier{Value = "source"},
DataType = new WParameterizedDataTypeReference{Name = new WSchemaObjectName(new Identifier{Value = "bigint"})},
Constraints = new List<WConstraintDefinition>
{
new WUniqueConstraintDefinition
{
Clustered = true,
IsPrimaryKey = true
}
}
},
new WColumnDefinition
{
ColumnIdentifier = new Identifier{Value = "binary1"},
DataType = new WParameterizedDataTypeReference
{
Name = new WSchemaObjectName(new Identifier{Value = "varbinary"}),
Parameters = new List<Literal>{new MaxLiteral{Value = "max"}}
},
},
new WColumnDefinition
{
ColumnIdentifier = new Identifier{Value = "sinkCnt"},
DataType = new WParameterizedDataTypeReference
{
Name = new WSchemaObjectName(new Identifier{Value = "int"}),
},
},
new WColumnDefinition
{
ColumnIdentifier = new Identifier{Value = "srcCnt"},
DataType = new WParameterizedDataTypeReference
{
Name = new WSchemaObjectName(new Identifier{Value = "int"}),
},
},
},
Indexes = new List<WIndexDefinition>(),
TableConstraints = new List<WConstraintDefinition>()
}
});
var tableVar = new WSpecialNamedTableReference
{
TableObjectName = new WSchemaObjectName(new Identifier { Value = "@" + deleteEdgeTempTable })
};
res.Add(deleteCommonTableExpr);
res.Add(new WInsertSpecification
{
Target = tableVar,
InsertSource = new WSelectInsertSource
{
Select = new WSelectQueryBlock
{
SelectElements = new WSelectElement[]
{
new WSelectScalarExpression
{
SelectExpr = new WFunctionCall
{
FunctionName = new Identifier {Value = "ISNULL"},
Parameters = new WScalarExpression[]
{
new WColumnReferenceExpression
{
MultiPartIdentifier =
new WSchemaObjectName(new Identifier[]
{
new Identifier {Value = deleteEdgeTableName + "_1"},
new Identifier {Value = "source"}
}),
},
new WColumnReferenceExpression
{
MultiPartIdentifier =
new WSchemaObjectName(new Identifier[]
{
new Identifier {Value = deleteEdgeTableName + "_2"},
new Identifier {Value = "source"}
}),
},
}
},
ColumnName = "source"
},
new WSelectScalarExpression
{
SelectExpr = new WColumnReferenceExpression
{
MultiPartIdentifier =
new WSchemaObjectName(new Identifier[] {new Identifier {Value = "binary1"}}),
}
},
//new WSelectScalarExpression
//{
// SelectExpr = new WColumnReferenceExpression
// {
// MultiPartIdentifier = new WSchemaObjectName(new Identifier[]{new Identifier{Value = "binary2"}}),
// }
//},
new WSelectScalarExpression
{
SelectExpr = new WFunctionCall
{
FunctionName = new Identifier {Value = "ISNULL"},
Parameters = new WScalarExpression[]
{
new WColumnReferenceExpression
{
MultiPartIdentifier =
new WSchemaObjectName(new Identifier[]
{
new Identifier {Value = deleteEdgeTableName + "_1"},
new Identifier {Value = "sinkCnt"}
}),
},
new WValueExpression
{
Value = "0"
},
}
},
ColumnName = "sinkCnt"
},
new WSelectScalarExpression
{
SelectExpr = new WFunctionCall
{
FunctionName = new Identifier {Value = "ISNULL"},
Parameters = new WScalarExpression[]
{
new WColumnReferenceExpression
{
MultiPartIdentifier =
new WSchemaObjectName(new Identifier[]
{
new Identifier {Value = deleteEdgeTableName + "_2"},
new Identifier {Value = "srcCnt"}
}),
},
new WValueExpression
{
Value = "0"
},
}
},
ColumnName = "srcCnt"
},
},
FromClause = new WFromClause
{
TableReferences = new WTableReference[]
{
new WQualifiedJoin
{
QualifiedJoinType = QualifiedJoinType.FullOuter,
FirstTableRef = new WQueryDerivedTable
{
Alias = new Identifier {Value = deleteEdgeTableName + "_1"},
QueryExpr = edgeSelectQuery
},
SecondTableRef = new WQueryDerivedTable
{
Alias = new Identifier {Value = deleteEdgeTableName + "_2"},
QueryExpr = reversedEdgeSelectQuery
},
JoinCondition = new WBooleanComparisonExpression()
{
ComparisonType = BooleanComparisonType.Equals,
FirstExpr = new WColumnReferenceExpression
{
MultiPartIdentifier =
new WSchemaObjectName(new Identifier[]
{
new Identifier {Value = deleteEdgeTableName + "_1"},
new Identifier {Value = "source"}
}),
},
SecondExpr = new WColumnReferenceExpression
{
MultiPartIdentifier =
new WSchemaObjectName(new Identifier[]
{
new Identifier {Value = deleteEdgeTableName + "_2"},
new Identifier {Value = "source"}
}),
}
}
},
}
}
}
}
});
res.Add(new WUpdateSpecification
{
Target = new WNamedTableReference
{
TableObjectName = sourceNameTable.TableObjectName
},
SetClauses = setClauses,
FromClause = new WFromClause
{
TableReferences = new WTableReference[]
{
new WQueryDerivedTable
{
Alias = new Identifier {Value = deleteEdgeTableName},
QueryExpr = new WSelectQueryBlock
{
SelectElements = new List<WSelectElement>()
{
new WSelectStarExpression()
},
FromClause = new WFromClause
{
TableReferences = new List<WTableReference> {tableVar}
}
}
},
}
},
WhereClause = whereClause,
TopRowFilter = node.TopRowFilter,
});
res.Add(new WSqlUnknownStatement
{
Statement = String.Format("DELETE FROM @{0}", deleteEdgeTempTable)
});
}
else
{
// Declare table variables
res.Add(new WDeclareTableVariable
{
VariableName = new Identifier { Value = "@" + deleteEdgeTempTable + "_1" },
Definition = new WTableDefinition
{
ColumnDefinitions = new WColumnDefinition[]
{
new WColumnDefinition
{
ColumnIdentifier = new Identifier {Value = "source"},
DataType =
new WParameterizedDataTypeReference
{
Name = new WSchemaObjectName(new Identifier {Value = "bigint"})
},
Constraints = new List<WConstraintDefinition>
{
new WUniqueConstraintDefinition
{
Clustered = true,
IsPrimaryKey = true
}
}
},
new WColumnDefinition
{
ColumnIdentifier = new Identifier {Value = "binary1"},
DataType = new WParameterizedDataTypeReference
{
Name = new WSchemaObjectName(new Identifier {Value = "varbinary"}),
Parameters = new List<Literal> {new MaxLiteral {Value = "max"}}
},
},
new WColumnDefinition
{
ColumnIdentifier = new Identifier {Value = "sinkCnt"},
DataType = new WParameterizedDataTypeReference
{
Name = new WSchemaObjectName(new Identifier {Value = "int"}),
},
},
},
Indexes = new List<WIndexDefinition>(),
TableConstraints = new List<WConstraintDefinition>()
}
});
res.Add(new WDeclareTableVariable
{
VariableName = new Identifier { Value = "@" + deleteEdgeTempTable + "_2" },
Definition = new WTableDefinition
{
ColumnDefinitions = new WColumnDefinition[]
{
new WColumnDefinition
{
ColumnIdentifier = new Identifier {Value = "source"},
DataType =
new WParameterizedDataTypeReference
{
Name = new WSchemaObjectName(new Identifier {Value = "bigint"})
},
Constraints = new List<WConstraintDefinition>
{
new WUniqueConstraintDefinition
{
Clustered = true,
IsPrimaryKey = true
}
}
},
new WColumnDefinition
{
ColumnIdentifier = new Identifier {Value = "srcCnt"},
DataType = new WParameterizedDataTypeReference
{
Name = new WSchemaObjectName(new Identifier {Value = "int"}),
},
},
},
Indexes = new List<WIndexDefinition>(),
TableConstraints = new List<WConstraintDefinition>()
}
});
var tableVar = new WSpecialNamedTableReference
{
TableObjectName = new WSchemaObjectName(new Identifier { Value = "@" + deleteEdgeTempTable + "_1" })
};
var reversedTableVar = new WSpecialNamedTableReference
{
TableObjectName = new WSchemaObjectName(new Identifier { Value = "@" + deleteEdgeTempTable + "_2" })
};
WInsertSpecification[] insertStat = new WInsertSpecification[]
{
new WInsertSpecification
{
Target = tableVar,
InsertSource = new WSelectInsertSource
{
Select = edgeSelectQuery
}
},
new WInsertSpecification
{
Target = reversedTableVar,
InsertSource = new WSelectInsertSource
{
Select = reversedEdgeSelectQuery
}
}
};
// Update statments for edge and reversed edge
WUpdateSpecification[] updateStat = new WUpdateSpecification[]
{
new WUpdateSpecification
{
Target = new WNamedTableReference
{
TableObjectName = sourceNameTable.TableObjectName
},
SetClauses = new List<WSetClause> {setClauses[0], setClauses[2]},
FromClause = new WFromClause
{
TableReferences = new WTableReference[]
{
new WQueryDerivedTable
{
QueryExpr = new WSelectQueryBlock
{
SelectElements = new List<WSelectElement>()
{
new WSelectStarExpression()
},
FromClause = new WFromClause
{
TableReferences = new List<WTableReference> {tableVar}
}
},
Alias = new Identifier {Value = deleteEdgeTableName},
},
}
},
WhereClause = whereClause,
TopRowFilter = node.TopRowFilter
},
new WUpdateSpecification
{
Target = new WNamedTableReference
{
TableObjectName = sinkNameTable.TableObjectName
},
SetClauses = new List<WSetClause> {setClauses[1]},
FromClause = new WFromClause
{
TableReferences = new WTableReference[]
{
new WQueryDerivedTable
{
Alias = new Identifier {Value = deleteEdgeTableName},
QueryExpr = new WSelectQueryBlock
{
SelectElements = new List<WSelectElement>()
{
new WSelectStarExpression()
},
FromClause = new WFromClause
{
TableReferences = new List<WTableReference> {reversedTableVar}
}
}
},
}
},
WhereClause = whereClause,
TopRowFilter = node.TopRowFilter
},
};
bool sourceFirst = compare < 0;
if (sourceFirst)
{
// With expression
res.Add(deleteCommonTableExpr);
res.Add(insertStat[0]);
res.Add(updateStat[0]);
res.Add(new WSqlUnknownStatement
{
Statement = String.Format("DELETE FROM @{0}_1", deleteEdgeTempTable)
});
// With expression
res.Add(deleteCommonTableExpr);
res.Add(insertStat[1]);
res.Add(updateStat[1]);
res.Add(new WSqlUnknownStatement
{
Statement = String.Format("DELETE FROM @{0}_2", deleteEdgeTempTable)
});
}
else
{
// With expression
res.Add(deleteCommonTableExpr);
res.Add(insertStat[1]);
res.Add(updateStat[1]);
res.Add(new WSqlUnknownStatement
{
Statement = String.Format("DELETE FROM @{0}_2", deleteEdgeTempTable)
});
// With expression
res.Add(deleteCommonTableExpr);
res.Add(insertStat[0]);
res.Add(updateStat[0]);
res.Add(new WSqlUnknownStatement
{
Statement = String.Format("DELETE FROM @{0}_1", deleteEdgeTempTable)
});
}
}
}
private List<WSqlStatement> Translate(IList<WSqlStatement> statements)
{
var result = new List<WSqlStatement>();
var index = 0;
for (var count = statements.Count; index < count; ++index)
{
var insertEdgeStatement = statements[index] as WInsertEdgeSpecification;
if (insertEdgeStatement != null)
{
result.Add(new WBeginTransactionStatement
{
Name = new WIdentifierOrValueExpression
{
Identifier = new Identifier { Value = "InsertEdgeTran" }
}
});
//result.Add(TranslateInsertEdge(insertEdgeStatement, false));
//result.Add(TranslateInsertEdge(insertEdgeStatement, true));
TranslateEdgeInsert(insertEdgeStatement,result);
result.Add(new WCommitTransactionStatement
{
Name = new WIdentifierOrValueExpression
{
Identifier = new Identifier { Value = "InsertEdgeTran" }
}
});
continue;
}
var deleteEdgeStatement = statements[index] as WDeleteEdgeSpecification;
if (deleteEdgeStatement != null)
{
result.Add(new WBeginTransactionStatement
{
Name = new WIdentifierOrValueExpression
{
Identifier = new Identifier { Value = "DeleteEdgeTran" }
}
});
//result.Add(TranslateDeleteEdge(deleteEdgeStatement, true));
//result.Add(TranslateDeleteEdge(deleteEdgeStatement, false));
TranslateEdgeDelete(deleteEdgeStatement,result);
result.Add(new WCommitTransactionStatement
{
Name = new WIdentifierOrValueExpression
{
Identifier = new Identifier { Value = "DeleteEdgeTran" }
}
});
continue;
}
var deleteNodeStatement = statements[index] as WDeleteNodeSpecification;
if (deleteNodeStatement != null)
{
var table = deleteNodeStatement.Target as WNamedTableReference;
if (table == null)
throw new GraphViewException("Target of DELETE NODE statement should be a named table reference.");
WBooleanExpression cond = new WBooleanComparisonExpression
{
ComparisonType = BooleanComparisonType.Equals,
FirstExpr = new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier { Value = "InDegree"})
},
SecondExpr = new WValueExpression
{
Value = "0"
}
};
var tableSchema = table.TableObjectName.SchemaIdentifier == null
? "dbo"
: table.TableObjectName.SchemaIdentifier.Value;
var tableName = table.TableObjectName.BaseIdentifier.Value;
using (var command = _conn.CreateCommand())
{
command.CommandText = string.Format(
@"SELECT [TableSchema], [TableName], [ColumnName] FROM [{3}] WHERE TableSchema = '{0}' and [TableName]='{1}' and ColumnRole={2}",
tableSchema, tableName, 1, GraphViewConnection.MetadataTables[1]);
using (var reader = command.ExecuteReader())
{
while (reader.Read())
{
var col = reader["ColumnName"].ToString();
cond = WBooleanBinaryExpression.Conjunction(cond, new WBooleanComparisonExpression
{
ComparisonType = BooleanComparisonType.Equals,
FirstExpr = new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier { Value = col + "OutDegree" })
},
SecondExpr = new WValueExpression
{
Value = "0"
}
});
}
}
}
WWhereClause checkDeleteNode = new WWhereClause
{
SearchCondition = new WBooleanNotExpression {Expression = cond}
};
if (deleteNodeStatement.WhereClause == null ||
deleteNodeStatement.WhereClause.SearchCondition == null)
{
deleteNodeStatement.WhereClause = new WWhereClause {SearchCondition = cond};
}
else
{
checkDeleteNode = new WWhereClause
{
SearchCondition = new WBooleanBinaryExpression
{
BooleanExpressionType = BooleanBinaryExpressionType.And,
FirstExpr = deleteNodeStatement.WhereClause.SearchCondition,
SecondExpr = checkDeleteNode.SearchCondition
}
};
deleteNodeStatement.WhereClause = new WWhereClause
{
SearchCondition = new WBooleanBinaryExpression
{
BooleanExpressionType = BooleanBinaryExpressionType.And,
FirstExpr = deleteNodeStatement.WhereClause.SearchCondition,
SecondExpr = cond
}
};
}
using (var command = _conn.CreateCommand())
{
command.CommandText = string.Format("SELECT InDegree FROM {0}.{1} {2}", tableSchema, tableName,
checkDeleteNode.ToString());
using (var reader = command.ExecuteReader())
{
while (reader.Read())
{
throw new GraphViewException(
string.Format(
"Node(s) of node table {0} being deleted still has/have ingoing or outdoing edge(s)",
tableName));
}
}
}
}
result.Add(statements[index]);
}
return result;
}
public virtual void Visit(WWhereClause node)
{
node.AcceptChildren(this);
}
public WSelectQueryBlock()
{
FromClause = new WFromClause();
WhereClause = new WWhereClause();
}
public WWhereClause Invoke(WWhereClause node, MatchGraph graph, Dictionary<string, string> columnTableMapping)
{
_checkNodeEdgeReferenceVisitor = new CheckNodeEdgeReferenceVisitor(graph, columnTableMapping)
;
if (node.SearchCondition != null)
node.SearchCondition.Accept(this);
return _nodeEdgePredicatesWhenClause;
}
public WUpdateSpecification()
{
WhereClause = new WWhereClause();
}
public WDeleteSpecification()
{
WhereClause = new WWhereClause();
}
private void TranslateNodeDelete(WDeleteNodeSpecification node, List<WSqlStatement> res)
{
var table = node.Target as WNamedTableReference;
if (table == null)
throw new GraphViewException("Target of DELETE NODE statement should be a named table reference.");
WBooleanExpression cond = new WBooleanComparisonExpression
{
ComparisonType = BooleanComparisonType.Equals,
FirstExpr = new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier { Value = "InDegree" })
},
SecondExpr = new WValueExpression
{
Value = "0"
}
};
var tableSchema = table.TableObjectName.SchemaIdentifier == null
? "dbo"
: table.TableObjectName.SchemaIdentifier.Value;
var tableName = table.TableObjectName.BaseIdentifier.Value;
using (var command = Tx.Connection.CreateCommand())
{
command.Transaction = Tx;
command.CommandText = string.Format(
@"SELECT [TableSchema], [TableName], [ColumnName] FROM [{3}] WHERE TableSchema = '{0}' and [TableName]='{1}' and ColumnRole={2}",
tableSchema, tableName, 1, GraphViewConnection.MetadataTables[1]);
using (var reader = command.ExecuteReader())
{
while (reader.Read())
{
var col = reader["ColumnName"].ToString();
cond = WBooleanBinaryExpression.Conjunction(cond, new WBooleanComparisonExpression
{
ComparisonType = BooleanComparisonType.Equals,
FirstExpr = new WColumnReferenceExpression
{
MultiPartIdentifier = new WMultiPartIdentifier(new Identifier { Value = col + "OutDegree" })
},
SecondExpr = new WValueExpression
{
Value = "0"
}
});
}
}
}
WWhereClause checkDeleteNode = new WWhereClause
{
SearchCondition = new WBooleanNotExpression { Expression = new WBooleanParenthesisExpression { Expression = cond } }
};
if (node.WhereClause == null ||
node.WhereClause.SearchCondition == null)
{
node.WhereClause = new WWhereClause { SearchCondition = cond };
}
else
{
checkDeleteNode = new WWhereClause
{
SearchCondition = new WBooleanBinaryExpression
{
BooleanExpressionType = BooleanBinaryExpressionType.And,
FirstExpr = node.WhereClause.SearchCondition,
SecondExpr = checkDeleteNode.SearchCondition
}
};
node.WhereClause = new WWhereClause
{
SearchCondition = new WBooleanBinaryExpression
{
BooleanExpressionType = BooleanBinaryExpressionType.And,
FirstExpr = node.WhereClause.SearchCondition,
SecondExpr = cond
}
};
}
using (var command = Tx.Connection.CreateCommand())
{
command.Transaction = Tx;
command.CommandText = string.Format("SELECT InDegree FROM {0}.{1} {2}", tableSchema, tableName,
checkDeleteNode.ToString());
using (var reader = command.ExecuteReader())
{
while (reader.Read())
{
throw new GraphViewException(
string.Format(
"Node(s) of node table {0} being deleted still has/have ingoing or outdoing edge(s)",
tableName));
}
}
}
res.Add(new WDeleteSpecification
{
FromClause = node.FromClause,
Target = node.Target,
TopRowFilter = node.TopRowFilter,
WhereClause = node.WhereClause,
});
}
public void UpdateWherClause(WWhereClause whereClause, WBooleanExpression node)
{
if (whereClause.SearchCondition == null)
whereClause.SearchCondition = node;
else
{
whereClause.SearchCondition = new WBooleanBinaryExpression
{
FirstExpr = whereClause.SearchCondition,
SecondExpr = node,
BooleanExpressionType = BooleanBinaryExpressionType.And
};
}
}
public WSelectQueryBlock()
{
FromClause = new WFromClause();
WhereClause = new WWhereClause();
}
