Then track performance of query you can invoke ToQueryString method. If you have a lot of parameters in query it just add @p1, @p2, etc. What to do if you want inline it?
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There are several different ways. The degree of their applicability depends on the DBMS used, so specify it. For example, you can use an array in PostgreSQL or a TVP in Sql Server. Also we can use JSON and functions like OPENJSON in Sql Server or JSON_EACH in SQLite. We can also create a temporary table, fill in the data and then JOIN it to the query.– Alexander PetrovCommented Jul 8 at 7:23
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Inline... only for the query string? You probably don't want to inline parameters for query execution, do you?– Gert ArnoldCommented Jul 8 at 11:26
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@GertArnold, looks like bad prepared Q&A. OP is trying to show how to visualise complex query without parameters for probably Copy/Paste to SQL Analyser or other tool.– Svyatoslav DanylivCommented Jul 9 at 4:12
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1 Answer
You can just use this expression visitor for inline parameters:
public class ParameterReplacer : System.Linq.Expressions.ExpressionVisitor
{
protected override Expression VisitMember(MemberExpression node)
{
if (node.Expression is ConstantExpression constantExpression)
{
var container = constantExpression.Value;
var member = node.Member;
if (member is System.Reflection.FieldInfo field)
{
var value = field.GetValue(container);
if (value is string or not IEnumerable)
{
return Expression.Constant(value, field.FieldType);
}
}
else if (member is System.Reflection.PropertyInfo property)
{
var value = property.GetValue(container);
if (value is string or not IEnumerable)
{
return Expression.Constant(value, property.PropertyType);
}
}
}
return base.VisitMember(node);
}
public static IQueryable<T> ReplaceParamToConst<T>(IQueryable<T> query)
{
var replacer = new ParameterReplacer();
return query.Provider.CreateQuery<T>(replacer.Visit(query.Expression));
}
}
Usage: ParameterReplacer.ReplaceParamToConst(query).ToQueryString();