DapperLib/Dapper

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Dapper - a simple object mapper for .Net

Stars: 18.4k
Forks: 3.7k
Open beginner issues: 0
Indexed issues: 466
Avg merge: 5h 8m
Merged PRs (30d): 1

Dominant language: C#
License: No license data
Last GitHub push: Sep 12, 2026
Latest indexed: Sep 20, 2026
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466 open issues indexed

IN clause is generated with syntax errors when generated variables conflict. Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

DapperLib/Dapper#1040 · 1 reaction · Opened Jun 13, 2018
Oracle Timestamp with Time Zone not being mapped to DateTimeOffset properly Open

area:mapping db:oracle

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#1039 · 4 comments · 4 reactions · Opened Jun 12, 2018
Custom Type Handler works correctly according to position of columns in the SELECT statment Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#1036 · Opened Jun 5, 2018
Ignore some properties Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#1033 · 4 comments · 4 reactions · Opened Jun 2, 2018
Possibility to insert value from another model Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#1028 · Opened May 20, 2018
Pass output parameters in a template object in Dapper Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#1017 · 1 comment · Opened May 1, 2018
Dapper custom deserialization / mapping question Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

DapperLib/Dapper#1010 · 1 comment · Opened Apr 23, 2018
System.Data.DataException:“Error parsing column 6 (Amount=0.01 - Double)” Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#1002 · 6 comments · Opened Apr 12, 2018
System.InvalidCastException - Dapper 1.50.4 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#1001 · 10 comments · Opened Apr 11, 2018
Proposal: Allow Query() to support polymorphic loads Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

DapperLib/Dapper#976 · 3 comments · 2 reactions · Opened Mar 19, 2018
QueryAsync cannot insert multiple items and return a single record set. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#960 · 8 comments · 7 reactions · Opened Mar 5, 2018
Default Parameter Type for DynamicParameters Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

DapperLib/Dapper#958 · 6 comments · Opened Mar 1, 2018
DynamicParameters - Type Mapping like Column Type Mapper with SqlMapper.ITypeMap Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

DapperLib/Dapper#954 · Opened Feb 22, 2018
Add SQL text to exceptions Open

area:settings feature request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#943 · 1 comment · 5 reactions · Opened Feb 10, 2018
One-to-one and one-to-many relationship Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#941 · 1 reaction · Opened Feb 7, 2018
CustomTypeHandler seems to doesn't work correctly Open

area:typehandlers

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#934 · 12 comments · Opened Feb 2, 2018
Custom TypeHandler Parse method only being passed the first column of result from QueryAsync Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

DapperLib/Dapper#929 · 3 comments · Opened Jan 30, 2018
Implement GetDynamicMemberNames on SqlMapper.DapperRowMetaObject Open

area:api up-for-grabs

Difficulty 2/5 1-3 hours Newbie friendliness 50/100

DapperLib/Dapper#920 · 1 comment · Opened Jan 12, 2018
Add command flags to overloads Open

area:api

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#918 · 1 comment · 1 reaction · Opened Jan 12, 2018
InvalidCastException (on foreign key mapping to nullable numeric types) Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

DapperLib/Dapper#917 · 3 comments · Opened Jan 9, 2018
Dapper.SqlMapper system out memory Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

DapperLib/Dapper#914 · 3 comments · Opened Jan 4, 2018
Argument null exception at System.Reflection.Emit.DynamicILGenerator.Emit caused by specific property name Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#912 · 3 comments · 3 reactions · Opened Dec 30, 2017
Error parsing column Open

db:oracle

Difficulty 3/5 1-2 days Newbie friendliness 25/100

DapperLib/Dapper#910 · 5 comments · Opened Dec 25, 2017
QueryAsync throws if stored procedure selects no column Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#908 · Opened Dec 20, 2017
System.ArgumentException is thrown when passing empty SqlDataRecord list as an anonymous object or as table-valued parameter to Dapper. Open

Difficulty 2/5 1-3 hours Newbie friendliness 42/100

DapperLib/Dapper#901 · Opened Dec 14, 2017
SqlServer query with array parameters produce invalid SQL when parameters names would collide Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#898 · 1 comment · Opened Dec 13, 2017
Support System.Xml.XmlReader parameters Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#895 · 3 comments · Opened Dec 6, 2017
SqlMapper.AddTypeHandler doesnt reset internal deserializer cache Open

bug

DapperLib/Dapper#885 · 3 comments · 2 reactions · 1 assignee · Opened Nov 23, 2017
select * from in error $s1 Parameter is wrong Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#870 · 4 comments · Opened Oct 28, 2017
OleDb parameter replacement broken? Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

DapperLib/Dapper#863 · 2 comments · Opened Oct 18, 2017
DataException when converting SQLite nullable bigint to C# nullable int Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#862 · 3 comments · 3 reactions · Opened Oct 16, 2017
Multiple Result reading is very slow. Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#854 · 4 comments · Opened Oct 2, 2017
Please expose DynamicParameters.parameters Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

DapperLib/Dapper#849 · 4 comments · Opened Sep 23, 2017
ODBC Connection using IN statement throws "Must declare the scalar variable "@status1"." Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#840 · 2 comments · 2 reactions · Opened Sep 1, 2017
Caching Metadata Open

Difficulty 2/5 1-3 hours Newbie friendliness 25/100

DapperLib/Dapper#821 · Opened Jul 27, 2017
Overload for Add method in DynamicParameters Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#820 · Opened Jul 25, 2017
Error compile sql query "IN CLAUSE" to postgresql Open

db:postgresql

Difficulty 4/5 3-5 days Newbie friendliness 30/100

DapperLib/Dapper#817 · 6 comments · Opened Jul 21, 2017
Store Enum Value as String Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#813 · 32 comments · 45 reactions · Opened Jul 4, 2017
Request: Providing object instance to Dapper Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

DapperLib/Dapper#811 · Opened Jul 3, 2017
Proposal: simplify TVP creation Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

DapperLib/Dapper#807 · 6 comments · Opened Jun 19, 2017
Get type which was added with AddTypeMap Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#798 · 5 comments · Opened Jun 8, 2017
Support F# OTB Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

DapperLib/Dapper#786 · 1 comment · 3 reactions · Opened May 23, 2017
Query<T>() issue with array bound parameter (Oracle) Open

area:typehandlers db:oracle

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#777 · 2 reactions · Opened May 15, 2017
FatalExecutionEngineError when using struct and SqlMapper on 1.50.2 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

DapperLib/Dapper#773 · 1 comment · Opened May 11, 2017
Add support for order-agnostic constructor parameter SqlMapper.ITypeMap implementations Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#752 · 11 comments · 6 reactions · Opened Apr 24, 2017
SqlMapper.GridReader.IsConsumed should return true if stored procedure does not return any recordsets Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

DapperLib/Dapper#751 · 10 comments · 4 reactions · Opened Apr 24, 2017
Dynamic Outputparameters do not work with QUERY. Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#746 · Opened Apr 21, 2017
V2: What should the API look like for horizontally mapped data via tuples? Open

enhancement proposal v3.0

DapperLib/Dapper#745 · 7 comments · 5 reactions · 1 assignee · Opened Apr 21, 2017
Why only QueryAsync method have mulit mapping method overload with CommandDefinition Open

area:api

Difficulty 4/5 3-5 days Newbie friendliness 30/100

DapperLib/Dapper#743 · 4 comments · Opened Apr 18, 2017
SqlMapper.TypeHandler<DateTime?> not working with SQLite Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#742 · 2 comments · 6 reactions · Opened Apr 15, 2017

DapperLib/Dapper

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