public bool TryMatch(MemberExpression expression, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
MemberCallDelegate mcd;
if (SupportedMembers.TryGetValue(expression.Member, out mcd))
{
mcd(expression, queryBuilder, visitExpression, context);
return true;
}
return false;
}
private static bool CompareString(bool equal, MethodCallExpression methodCall, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
var count = methodCall.Arguments.Count;
if (count != 2 && count != 3)
return false;
//TODO: handle Oracle incorrect handling of empty string
var ce = methodCall.Arguments[0] as ConstantExpression;
if (ce != null && ce.Value == null)
return GuardForNull(equal, methodCall.Arguments[1], queryBuilder, visitExpression, context);
ce = methodCall.Arguments[1] as ConstantExpression;
if (ce != null && ce.Value == null)
return GuardForNull(equal, methodCall.Arguments[0], queryBuilder, visitExpression, context);
if (count == 2)
{
queryBuilder.Append("(");
if (context.InSelect)
queryBuilder.Append(" CASE WHEN ");
visitExpression(methodCall.Arguments[0]);
if (equal)
queryBuilder.Append(" = ");
else
queryBuilder.Append(" <> ");
visitExpression(methodCall.Arguments[1]);
}
else
{
var cmpValue = methodCall.Arguments[2] as ConstantExpression;
if (methodCall.Arguments[2].Type == typeof(bool) && cmpValue != null)
{
queryBuilder.Append("(");
if (context.InSelect)
queryBuilder.Append(" CASE WHEN ");
EscapeForLike(equal, (bool)cmpValue.Value, methodCall, queryBuilder, visitExpression);
}
else if (methodCall.Arguments[2].Type == typeof(StringComparison))
{
var cmpVal = (StringComparison)cmpValue.Value;
var ignoreCase = cmpVal != StringComparison.CurrentCulture
&& cmpVal != StringComparison.InvariantCulture
&& cmpVal != StringComparison.Ordinal;
queryBuilder.Append("(");
if (context.InSelect)
queryBuilder.Append(" CASE WHEN ");
EscapeForLike(equal, ignoreCase, methodCall, queryBuilder, visitExpression);
}
else return false;
}
if (context.InSelect)
queryBuilder.Append(" THEN 'Y' ELSE 'N' END");
queryBuilder.Append(")");
return true;
}
public bool TryMatch(Expression expression, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
var mce = expression as MethodCallExpression;
if (mce == null || !mce.Method.IsGenericMethod)
return false;
MethodCallDelegate mcd;
if (SupportedMethods.TryGetValue(mce.Method.GetGenericMethodDefinition(), out mcd))
{
return mcd(mce, queryBuilder, visitExpression);
}
return false;
}
public bool TryMatch(Expression expression, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
var mce = expression as MethodCallExpression;
if (mce == null)
return false;
MethodCallDelegate mcd;
if (SupportedMethods.TryGetValue(mce.Method, out mcd))
{
mcd(mce, queryBuilder, visitExpression, context);
return true;
}
return false;
}
public SubqueryParts(QueryParts parentQuery, bool canQueryInMemory, Expression selector, string contextName, QueryContext context)
: base(parentQuery.Locator,
contextName,
parentQuery.ConverterFactory,
parentQuery.Parameters,
context,
parentQuery.Simplifications,
parentQuery.ExpressionMatchers,
parentQuery.MemberMatchers,
parentQuery.ProjectionMatchers)
{
this.CanQueryInMemory = canQueryInMemory;
this.ParentQuery = parentQuery;
this.Selector = selector;
}
public bool TryMatch(MemberExpression expression, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
Dictionary<Type, MemberCallDelegate> dict;
var member = expression.Member;
if (member.DeclaringType.IsGenericType && SupportedMembers.TryGetValue(member.Name, out dict))
{
MemberCallDelegate mcd;
if (dict.TryGetValue(member.DeclaringType.GetGenericTypeDefinition(), out mcd))
{
mcd(expression, queryBuilder, visitExpression, context);
return true;
}
}
return false;
}
public bool TryMatch(Expression expression, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
var be = expression as BinaryExpression;
if (be == null)
return false;
if (expression.NodeType == ExpressionType.Equal || expression.NodeType == ExpressionType.NotEqual)
{
var ceZero = be.Right as ConstantExpression ?? be.Left as ConstantExpression;
var ceMethod = be.Left as MethodCallExpression ?? be.Right as MethodCallExpression;
if (ceZero == null || ceMethod == null || !ceZero.Value.Equals(0) || !CompareMethods.Contains(ceMethod.Method))
return false;
return CompareString(expression.NodeType == ExpressionType.Equal, ceMethod, queryBuilder, visitExpression, context);
}
return false;
}
//actually this is not correct because ToString uses regional settings, but let's ignore it for now
private static void ValueToString(MethodCallExpression methodCall, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
queryBuilder.Append("CAST(");
visitExpression(methodCall.Object);
queryBuilder.Append(" AS VARCHAR(4000))");
}
public SubqueryParts(QueryParts parentQuery, Expression selector, string contextName, QueryContext context)
: this(parentQuery, false, selector, contextName, context)
{
}
private static void GetLength(MemberExpression memberCall, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
queryBuilder.Append("(SELECT COUNT(*) FROM TABLE(");
visitExpression(memberCall.Expression);
queryBuilder.Append("))");
}
private static bool GuardForNull(bool equal, Expression exp, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
if (context.InSelect)
{
queryBuilder.Append(" CASE WHEN ");
visitExpression(exp);
if (equal)
queryBuilder.Append(" IS NULL THEN 'Y' ELSE 'N' END");
else
queryBuilder.Append(" IS NULL THEN 'N' ELSE 'Y' END");
}
else
{
visitExpression(exp);
if (equal)
queryBuilder.Append(" IS NULL");
else
queryBuilder.Append(" IS NOT NULL");
}
return true;
}
public static SubqueryParts ParseSubquery(QueryModel queryModel, QueryParts parentQuery, bool canQueryInMemory, string contextName, QueryContext context)
{
var visitor = new SubqueryGeneratorQueryModelVisitor(parentQuery, canQueryInMemory, queryModel.SelectClause.Selector, contextName, context);
visitor.VisitQueryModel(queryModel);
return visitor.QueryParts;
}
public static SubqueryParts ParseSubquery(QueryModel queryModel, QueryParts parentQuery, string contextName, QueryContext context)
{
return ParseSubquery(queryModel, parentQuery, false, contextName, context);
}
private SubqueryGeneratorQueryModelVisitor(QueryParts parentQuery, bool canQueryInMemory, Expression selector, string contextName, QueryContext context)
{
QueryParts = new SubqueryParts(parentQuery, canQueryInMemory, selector, contextName, context);
}
private static bool CheckForNull(Expression exp, StringBuilder queryBuilder, QueryContext context)
{
var ce = exp as ConstantExpression;
if (ce == null || ce.Value != null)
return false;
if (context.InSelect)
queryBuilder.Append("'N'");
else
queryBuilder.Append(" 0=1");
return true;
}
private static void Compare(bool before, bool after, MethodCallExpression methodCall, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
bool ignoreCase = false;
ConstantExpression ce;
if (methodCall.Arguments.Count == 2)
{
ce = methodCall.Arguments[1] as ConstantExpression;
switch ((StringComparison)ce.Value)
{
case StringComparison.CurrentCulture:
case StringComparison.InvariantCulture:
case StringComparison.Ordinal:
break;
default:
ignoreCase = true;
break;
}
}
if (context.InSelect)
queryBuilder.Append(" CASE WHEN");
else
queryBuilder.Append("(");
ce = methodCall.Object as ConstantExpression;
if (ce != null)
{
if (ignoreCase)
visitExpression(ConstantExpression.Constant((ce.Value as string).ToUpper(), ce.Type));
else
visitExpression(ce);
}
else
{
if (ignoreCase)
{
queryBuilder.Append(" UPPER(");
visitExpression(methodCall.Object);
queryBuilder.Append(")");
}
else
visitExpression(methodCall.Object);
}
bool asLike = before || after;
if (asLike)
queryBuilder.Append(" LIKE ");
else
queryBuilder.Append(" = ");
if (before)
queryBuilder.Append("'%' || ");
ce = methodCall.Arguments[0] as ConstantExpression;
if (ce != null)
{
if (asLike)
{
var value = ce.Value as string;
if (ignoreCase)
value = value.ToUpper();
value = value.Replace(@"\", @"\\").Replace(@"_", @"\_").Replace(@"%", @"\%");
visitExpression(ConstantExpression.Constant(value, ce.Type));
}
else if (ignoreCase)
visitExpression(ConstantExpression.Constant((ce.Value as string).ToUpper(), ce.Type));
else
visitExpression(ce);
}
else
{
if (asLike)
{
if (ignoreCase)
queryBuilder.Append(" UPPER(");
queryBuilder.Append("REPLACE(REPLACE(REPLACE(");
visitExpression(methodCall.Object);
queryBuilder.Append(@", '\','\\'), '_','\_'), '%','\%')");
if (ignoreCase)
queryBuilder.Append(")");
}
else if (ignoreCase)
{
queryBuilder.Append(" UPPER(");
visitExpression(methodCall.Object);
queryBuilder.Append(")");
}
else
visitExpression(methodCall.Object);
}
if (after)
queryBuilder.Append(" || '%'");
if (asLike)
queryBuilder.Append(@" ESCAPE '\' ");
if (context.InSelect)
queryBuilder.Append(" THEN 'Y' ELSE 'N' END");
else
queryBuilder.Append(")");
}
/*
private static void WithFormat(MethodCallExpression methodCall, StringBuilder queryBuilder, Action<Expression> visitExpression, bool inSelect, bool inWhere)
{
queryBuilder.Append("format(");
var index = queryBuilder.Length;
visitExpression(methodCall.Arguments[0]);
var count = methodCall.Arguments.Count - 1;
var substr = queryBuilder.ToString(index, queryBuilder.Length - index);
for (int i = 0; i < count; i++)
substr = substr.Replace("{" + i + "}", "%" + (i + 1) + "$s");
queryBuilder.Length = index;
queryBuilder.Append(substr);
for (int i = 0; i < count; i++)
{
queryBuilder.Append(",");
visitExpression(methodCall.Arguments[i + 1]);
}
queryBuilder.Append(")");
}
private static void WithFormatArray(MethodCallExpression methodCall, StringBuilder queryBuilder, Action<Expression> visitExpression, bool inSelect, bool inWhere)
{
queryBuilder.Append("format(");
var index = queryBuilder.Length;
visitExpression(methodCall.Arguments[0]);
var args = (NewArrayExpression)methodCall.Arguments[1];
var count = args.Expressions.Count;
var substr = queryBuilder.ToString(index, queryBuilder.Length - index);
for (int i = 0; i < count; i++)
substr = substr.Replace("{" + i + "}", "%" + (i + 1) + "$s");
queryBuilder.Length = index;
queryBuilder.Append(substr);
for (int i = 0; i < count; i++)
{
queryBuilder.Append(",");
visitExpression(args.Expressions[i]);
}
queryBuilder.Append(")");
}
*/
private static void ReplaceString(MethodCallExpression methodCall, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
queryBuilder.Append("REPLACE(");
visitExpression(methodCall.Object);
queryBuilder.Append(",");
visitExpression(methodCall.Arguments[0]);
queryBuilder.Append(",");
visitExpression(methodCall.Arguments[1]);
queryBuilder.Append(")");
}
private static void MatchStringToUpper(MethodCallExpression methodCall, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
queryBuilder.Append("UPPER(");
visitExpression(methodCall.Object);
queryBuilder.Append(")");
}
private static void MatchStringStartsWith(MethodCallExpression methodCall, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
if (!CheckForNull(methodCall.Arguments[0], queryBuilder, context))
Compare(false, true, methodCall, queryBuilder, visitExpression, context);
}
private static void IsNullOrWhiteSpace(MethodCallExpression methodCall, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
//TODO different from C#
queryBuilder.Append("TRIM(");
visitExpression(methodCall.Arguments[0]);
queryBuilder.Append(") IS NULL ");
}
private static void IsNullOrEmpty(MethodCallExpression methodCall, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
//TODO check if length is greater than 0
visitExpression(methodCall.Arguments[0]);
queryBuilder.Append(" IS NULL ");
}
private static void GetStringLength(MemberExpression memberCall, StringBuilder queryBuilder, Action<Expression> visitExpression, QueryContext context)
{
queryBuilder.Append("length(");
visitExpression(memberCall.Expression);
queryBuilder.Append(")");
}
public string GetSqlExpression(Expression expression, string contextName, QueryContext context)
{
return(SqlGeneratorExpressionTreeVisitor.GetSqlExpression(expression, this, contextName, context));
}