├── .gitattributes ├── .gitignore ├── DapperHelperDemo.sln ├── DapperHelperDemo ├── DapperHelper.cs ├── DapperHelperDemo.csproj ├── DatabaseService.cs ├── Models │ └── User.cs └── Program.cs └── README.md /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). 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2 | using System; 3 | using System.Collections.Generic; 4 | using System.Data; 5 | using System.Text; 6 | 7 | namespace DapperHelperDemo 8 | { 9 | /// 10 | /// The DapperHelper manages the base validation of input values and allows for the easy generation of well formed Insert and Update statements 11 | /// 12 | public class DapperHelper 13 | { 14 | private readonly Dictionary _parameters = new Dictionary(); 15 | private readonly SortedDictionary _conditionalParameters = new SortedDictionary(); 16 | 17 | private readonly string _tableName; 18 | private readonly string _whereSql; 19 | 20 | public DapperHelper(string tableName, string whereSql = null) 21 | { 22 | _tableName = tableName; 23 | _whereSql = whereSql; 24 | } 25 | 26 | /// 27 | /// Adds the supplied parameterName to value mapping to a collection 28 | /// of items used in the insert and update values to be modified. 29 | /// This method does not check for existing values 30 | /// 31 | /// 32 | /// 33 | public void Add(string parameterName, object value) 34 | { 35 | if (_parameters.ContainsKey(parameterName)) 36 | throw new DuplicateNameException("This field was already declared"); 37 | 38 | _parameters.Add(parameterName, value); 39 | } 40 | 41 | /// 42 | /// Method to add variables that will not be affected by insert or update 43 | /// operations but are necessary for use in the where clause 44 | /// 45 | /// 46 | /// 47 | public void AddCondition(string parameterName, object value) 48 | { 49 | if (_parameters.ContainsKey(parameterName) || _conditionalParameters.ContainsKey(parameterName)) 50 | throw new DuplicateNameException("This field was already declared"); 51 | 52 | _conditionalParameters.Add(parameterName, value); 53 | } 54 | 55 | /// 56 | /// Creates an insert statement for a single record that returns the bigint 57 | /// identity of the record inserted 58 | /// Throws an exception if the collection is empty 59 | /// 60 | public string InsertSql 61 | { 62 | get 63 | { 64 | if (_parameters.Keys.Count == 0) 65 | throw new Exception("Attempted to perform an insert without any input parameters."); 66 | 67 | var fields = string.Join(", ", _parameters.Keys); 68 | var values = string.Join(", @", _parameters.Keys); 69 | return "DECLARE @output table(ID bigint); " + 70 | $"INSERT INTO {_tableName}({fields}) " + 71 | "OUTPUT INSERTED.[ID] " + 72 | "INTO @output " + 73 | $"VALUES(@{values}) " + 74 | "SELECT * FROM @output;"; 75 | } 76 | } 77 | 78 | /// 79 | /// Creates an update statement for a single record based on the key value pairs 80 | /// that have been added 81 | /// Throws an exception if the collection is empty 82 | /// 83 | public string UpdateSql 84 | { 85 | get 86 | { 87 | if (string.IsNullOrEmpty(_whereSql)) 88 | throw new Exception("Attempted to perform an update without providing a where clause. DapperHelper.UpdateSql"); 89 | 90 | if (_parameters.Keys.Count == 0) 91 | throw new Exception("Attempted to perform an update without any input parameters. DapperHelper.UpdateSql"); 92 | 93 | var sb = new StringBuilder(); 94 | foreach (var parameterName in _parameters.Keys) 95 | { 96 | sb.Append($"{parameterName} = @{parameterName}, "); 97 | } 98 | 99 | return $"UPDATE {_tableName} SET {sb.ToString().Substring(0, sb.Length - 2)} {_whereSql};"; 100 | } 101 | } 102 | 103 | /// 104 | /// Generates a DynamicParameters instance based on the key value pairs 105 | /// that have been added 106 | /// 107 | public DynamicParameters Parameters 108 | { 109 | get 110 | { 111 | var parms = new DynamicParameters(); 112 | foreach (var parameterName in _parameters.Keys) 113 | { 114 | parms.Add(parameterName, _parameters[parameterName]); 115 | } 116 | foreach (var parameterName in _conditionalParameters.Keys) 117 | { 118 | parms.Add(parameterName, _conditionalParameters[parameterName]); 119 | } 120 | return parms; 121 | } 122 | } 123 | } 124 | } 125 | -------------------------------------------------------------------------------- /DapperHelperDemo/DapperHelperDemo.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp3.1 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | -------------------------------------------------------------------------------- /DapperHelperDemo/DatabaseService.cs: -------------------------------------------------------------------------------- 1 | using Dapper; 2 | using System; 3 | using System.Collections.Generic; 4 | using System.Data; 5 | using System.Data.SqlClient; 6 | using System.Linq; 7 | using System.Text; 8 | 9 | namespace DapperHelperDemo 10 | { 11 | public class DatabaseService 12 | { 13 | protected string ConnectionString { get; set; } 14 | 15 | public DatabaseService(string connectionString) 16 | { 17 | ConnectionString = connectionString; 18 | } 19 | 20 | public List Query(string sql, object parameters) 21 | { 22 | try 23 | { 24 | using SqlConnection conn = new SqlConnection(ConnectionString); 25 | return conn.Query(sql, parameters).ToList(); 26 | } 27 | catch 28 | { 29 | return default; 30 | } 31 | } 32 | 33 | public T QueryFirst(string sql) 34 | { 35 | return QueryFirst(sql, null); 36 | } 37 | 38 | public T QueryFirst(string sql, object parameters) 39 | { 40 | try 41 | { 42 | using SqlConnection conn = new SqlConnection(ConnectionString); 43 | return conn.QueryFirst(sql, parameters); 44 | } 45 | catch(Exception ex) 46 | { 47 | //Log the exception 48 | throw; 49 | } 50 | } 51 | 52 | public T QueryFirstOrDefault(string sql) 53 | { 54 | return QueryFirstOrDefault(sql, null); 55 | } 56 | 57 | public T QueryFirstOrDefault(string sql, object parameters) 58 | { 59 | try 60 | { 61 | using SqlConnection conn = new SqlConnection(ConnectionString); 62 | return conn.QueryFirstOrDefault(sql, parameters); 63 | } 64 | catch 65 | { 66 | //Log the exception 67 | return default; 68 | } 69 | } 70 | 71 | public T QuerySingle(string sql) 72 | { 73 | return QuerySingle(sql, null); 74 | } 75 | 76 | public T QuerySingle(string sql, object parameters) 77 | { 78 | try 79 | { 80 | using SqlConnection conn = new SqlConnection(ConnectionString); 81 | return conn.QuerySingle(sql, parameters); 82 | } 83 | catch(Exception ex) 84 | { 85 | //Log the exception 86 | throw; 87 | } 88 | } 89 | 90 | public T QuerySingleOrDefault(string sql) 91 | { 92 | return QuerySingleOrDefault(sql, null); 93 | } 94 | 95 | public T QuerySingleOrDefault(string sql, object parameters) 96 | { 97 | try 98 | { 99 | using SqlConnection conn = new SqlConnection(ConnectionString); 100 | return conn.QuerySingleOrDefault(sql, parameters); 101 | } 102 | catch (Exception ex) 103 | { 104 | return default; 105 | } 106 | } 107 | 108 | public void Execute(string sql) 109 | { 110 | Execute(sql, null); 111 | } 112 | 113 | public void Execute(string sql, object parameters) 114 | { 115 | using SqlConnection conn = new SqlConnection(ConnectionString); 116 | conn.Execute(sql, parameters); 117 | } 118 | 119 | public T ExecuteScalar(string sql, object parameters) 120 | { 121 | try 122 | { 123 | using SqlConnection conn = new SqlConnection(ConnectionString); 124 | T result = conn.ExecuteScalar(sql, parameters); 125 | return result; 126 | } 127 | catch (Exception ex) 128 | { 129 | return default; 130 | } 131 | } 132 | 133 | 134 | public T ExecuteInsert(DapperHelper helper) 135 | { 136 | return ExecuteScalar(helper.InsertSql, helper.Parameters); 137 | } 138 | 139 | public void ExecuteUpdate(DapperHelper helper) 140 | { 141 | Execute(helper.UpdateSql, helper.Parameters); 142 | } 143 | 144 | public void ExecuteStoredProcedure(string sql) 145 | { 146 | ExecuteStoredProcedure(sql, null); 147 | } 148 | 149 | public void ExecuteStoredProcedure(string sql, object parameters) 150 | { 151 | using (SqlConnection conn = new SqlConnection(ConnectionString)) 152 | { 153 | conn.Query(sql, parameters, commandType: CommandType.StoredProcedure); 154 | } 155 | } 156 | 157 | public List ExecuteStoredProcedure(string sql, object parameters) 158 | { 159 | try 160 | { 161 | using (SqlConnection conn = new SqlConnection(ConnectionString)) 162 | { 163 | return conn.Query(sql, parameters, commandType: CommandType.StoredProcedure).ToList(); 164 | } 165 | } 166 | catch 167 | { 168 | return null; 169 | } 170 | } 171 | } 172 | } 173 | -------------------------------------------------------------------------------- /DapperHelperDemo/Models/User.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Text; 4 | 5 | namespace DapperHelperDemo.Models 6 | { 7 | public class User 8 | { 9 | public int ID { get; set; } 10 | public string FirstName { get; set; } 11 | public string LastName { get; set; } 12 | public DateTime DateOfBirth { get; set; } 13 | } 14 | } 15 | -------------------------------------------------------------------------------- /DapperHelperDemo/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace DapperHelperDemo 4 | { 5 | class Program 6 | { 7 | static void Main(string[] args) 8 | { 9 | DapperHelper helper = new DapperHelper("TableName"); 10 | helper.Add("IntValue", 5); 11 | helper.Add("DateTimeValue", DateTime.Now); 12 | helper.Add("StringValue", "This is a string"); 13 | 14 | var insertSql = helper.InsertSql; 15 | var parameters = helper.Parameters; 16 | 17 | Console.WriteLine("---------------Insert SQL------------------"); 18 | Console.WriteLine(insertSql); 19 | Console.WriteLine("------------Insert Parameters--------------"); 20 | foreach (var parameterName in parameters.ParameterNames) 21 | { 22 | var value = parameters.Get(parameterName); 23 | Console.WriteLine(parameterName + ": " + value); 24 | } 25 | 26 | Console.WriteLine("--------------Update SQL-------------------"); 27 | 28 | //Remove the WHERE clause to see an exception thrown by DapperHelper. 29 | DapperHelper updateHelper = new DapperHelper("UpdateTableName", "WHERE ID = @id"); 30 | updateHelper.AddCondition("id", 5); 31 | updateHelper.Add("DateTimeValue", DateTime.Now); 32 | updateHelper.Add("LongValue", 5827453L); 33 | //Uncomment the below line to see an exception thrown by DapperHelper 34 | //updateHelper.Add("DateTimeValue", DateTime.Now.AddDays(-7)); 35 | 36 | var updateSql = updateHelper.UpdateSql; 37 | var updateParameters = updateHelper.Parameters; 38 | 39 | Console.WriteLine(updateSql); 40 | 41 | Console.WriteLine("-----------Update Parameters---------------"); 42 | 43 | foreach (var parameterName in updateParameters.ParameterNames) 44 | { 45 | var value = updateParameters.Get(parameterName); 46 | Console.WriteLine(parameterName + ": " + value); 47 | } 48 | 49 | 50 | string connectionString = "Your Connection String"; 51 | DatabaseService myDB = new DatabaseService(connectionString); 52 | 53 | //The lines below this point will throw errors at runtime, 54 | //since the connection string above doesn't do anything. 55 | //Comment them out to run the program. 56 | 57 | DapperHelper insertHelper = new DapperHelper("Users"); //"Users" is the SQL table name 58 | 59 | insertHelper.Add("FirstName", "John"); 60 | insertHelper.Add("LastName", "Smith"); 61 | insertHelper.Add("DateOfBirth", new DateTime(1970, 1, 1)); 62 | 63 | myDB = new DatabaseService("ConnectionString"); 64 | int userID = myDB.ExecuteInsert(helper); 65 | 66 | updateHelper = new DapperHelper("Users", "WHERE ID = @ID"); 67 | updateHelper.AddCondition("ID", 5); 68 | updateHelper.Add("FirstName", "Josephina"); 69 | updateHelper.Add("LastName", "Ezekiel-Smith"); 70 | 71 | myDB = new DatabaseService("ConnectionString"); 72 | myDB.ExecuteUpdate(updateHelper); 73 | 74 | //Comment out the lines above this comment to run the sample 75 | 76 | Console.ReadLine(); 77 | } 78 | } 79 | } 80 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # DapperHelperDemo 2 | This is an example series where I set up a DapperHelper class to generate parameterized SQL statements for INSERTs and UPDATEs. These statements can then be used by Dapper to execute database calls. 3 | 4 | This project is used in the following blog post: 5 | 6 | * [Creating a Dapper Helper C# Class to Generate Parameterized SQL](https://exceptionnotfound.net/creating-a-dapper-helper-csharp-class-to-generate-parameterized-sql-inserts-and-updates/) 7 | 8 | The posts for this series were originally part of my paid newsletter [The Catch Block](https://exceptionnotfound.net/tag/thecatchblock/); you can sign up to get The Catch Block every Wednesday by [clicking here](https://exceptionnotfound.net/membership/) and choosing one of the paid options (yearly or monthly). 9 | 10 | The issues that use this repository are: 11 | 12 | * [The Catch Block #31 - Dapper Helper Beginnings](https://exceptionnotfound.net/the-catch-block-31-dapper-helper-beginnings/) 13 | * [The Catch Block #32 - Dapper Helper UPDATEs](https://exceptionnotfound.net/the-catch-block-32-dapper-helper-updates/) 14 | * [The Catch Block #33 - Dapper Helper Database Service](https://exceptionnotfound.net/the-catch-block-33-dapper-helper-database-service/) 15 | --------------------------------------------------------------------------------