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Database-Attribute_System
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Added check if given class is invalid
Changed BuildQuery to support recursive object[] copying
Changed structure
Added DbFunction to handle all Db-related stuff
master
Railz 6 years ago
parent 45e7f6b911
commit 97b7eaeffe
4 changed files with 82 additions and 45 deletions
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67
Database-Attribute_System/QueryBuilder.cs
Unescape Escape View File

@ -7,21 +7,29 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
{
public class QueryBuilder
{
/// <summary>
/// Builds an SELECT-Sql-query based on an object<para/>
/// Object needs to have at least 1 primary-key!
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="classObject">Given object (marked with Db-attributes)</param>
/// <returns>SELECT-Sql-query</returns>
public static string SelectByPrimaryKeys<T>(T classObject)
{
Type classType = classObject.GetType();
// Get db-table-name from class
string tableName = Function.GetDbTableName(classType);
string tableName = DbFunction.GetDbTableName(classType);
// Get class db-fields
Dictionary<string, object> dbPrimaryKeys = new Dictionary<string, object>() { };
Dictionary<string, object> dbAttributes = new Dictionary<string, object>() { };
Dictionary<string, object> dbForeignKeys = new Dictionary<string, object>() { };
Function.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
DbFunction.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
if (dbPrimaryKeys.Count == 0) throw new InvalidOperationException($"Cannot generate SQL-Query of '{classType.Name}'. No primary-key/s found!");
// Build where statements with primaryKey/s
object[] param = Function.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
object[] param = DbFunction.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
// Add SQL-command part
param[0] = $"SELECT * FROM {tableName} WHERE "+ param[0];
@ -29,19 +37,26 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
return BuildQuery(param);
}
/// <summary>
/// Builds an UPDATE-Sql-query based on an object<para/>
/// Object needs to have at least 1 primary-key!
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="classObject">Given object (marked with Db-attributes)</param>
/// <returns>UPDATE-Sql-query</returns>
public static string UpdateByPrimaryKeys<T>(T classObject)
{
Type classType = classObject.GetType();
// Get db-table-name from class
string tableName = Function.GetDbTableName(classType);
string tableName = DbFunction.GetDbTableName(classType);
// Get class db-fields
Dictionary<string, object> dbPrimaryKeys = new Dictionary<string, object>() { };
Dictionary<string, object> dbAttributes = new Dictionary<string, object>() { };
Dictionary<string, object> dbForeignKeys = new Dictionary<string, object>() { };
Function.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
DbFunction.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
if (dbPrimaryKeys.Count == 0) throw new InvalidOperationException($"Cannot generate SQL-Query of '{classType.Name}'. No primary-key/s found!");
// Add foreign-keys to attributes
foreach (KeyValuePair<string, object> dbForeignKey in dbForeignKeys)
@ -50,12 +65,12 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
}
// Build set-parameters
object[] paramSet = Function.BuildKeyEqualQuery(dbAttributes, ", ");
object[] paramSet = DbFunction.BuildKeyEqualQuery(dbAttributes, ", ");
// Add SQL-command part
paramSet[0] = $"UPDATE {tableName} SET "+ paramSet[0];
// Build where-parameters
object[] paramWhere = Function.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
object[] paramWhere = DbFunction.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
// Add SQL-command part
paramWhere[0] = " WHERE "+ paramWhere[0];
@ -63,21 +78,29 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
return BuildQuery(paramSet, paramWhere);
}
/// <summary>
/// Builds an DELETE-Sql-query based on an object<para/>
/// Object needs to have at least 1 primary-key!
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="classObject">Given object (marked with Db-attributes)</param>
/// <returns>DELETE-Sql-query</returns>
public static string DeleteByPrimaryKeys<T>(T classObject)
{
Type classType = classObject.GetType();
// Get db-table-name from class
string tableName = Function.GetDbTableName(classType);
string tableName = DbFunction.GetDbTableName(classType);
// Get class db-fields
Dictionary<string, object> dbPrimaryKeys = new Dictionary<string, object>() { };
Dictionary<string, object> dbAttributes = new Dictionary<string, object>() { };
Dictionary<string, object> dbForeignKeys = new Dictionary<string, object>() { };
Function.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
DbFunction.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
if (dbPrimaryKeys.Count == 0) throw new InvalidOperationException($"Cannot generate SQL-Query of '{classType.Name}'. No primary-key/s found!");
// Build where-parameters
object[] paramWhere = Function.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
object[] paramWhere = DbFunction.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
// Add SQL-command part
paramWhere[0] = $"DELETE FROM {tableName} WHERE "+ paramWhere[0];
@ -90,25 +113,17 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
/// <summary>
/// Build an SQL-query<para/>
/// Will build the query-string based on the <paramref name="param"/>s including serialising and escaping for SQL.<para/>
/// (Supported-Types: null, string, byte, int, float, double, DateTime, Guid)
/// </summary>
/// <param name="param">Params with alternating query-parts and objects beginning with a query-part
/// <para/>Example: "SELECT * FROM table WHERE id=", id, " AND name=", name</param>
/// <para/>Example: "SELECT * FROM table WHERE id=", id, " AND name=", name<para/>
/// Info: Any object[] will be opened recursively and added as <paramref name="param"/> accordingly!
/// </param>
public static string BuildQuery(params object[] param)
{
// Convert array to list and add object[] to it accordingly
// Convert array to list and add object[] to it recursively
List<object> paramz = new List<object>() { };
foreach (object obj in param)
{
if (!(obj is object[]))
paramz.Add(obj);
else
{
foreach (object obj2 in (object[])obj)
{
paramz.Add(obj2);
}
}
}
Function.RecursiveParameterCopying(ref paramz, (object[])param);
string query = "";
for (int i = 0; i < paramz.Count; i++)
@ -125,7 +140,7 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
{
paramString = "'" + Function.SqlEscape((string)paramz[i]) + "'"; // wrap in sql-brackets and escape sql, if any
}
else if (paramz[i].GetType() == typeof(int) || paramz[i].GetType() == typeof(float) || paramz[i].GetType() == typeof(double)) // Handle int, float & double
else if (paramz[i].GetType() == typeof(byte) || paramz[i].GetType() == typeof(int) || paramz[i].GetType() == typeof(float) || paramz[i].GetType() == typeof(double)) // Handle int, float & double
{
paramString = paramz[i].ToString().Replace(",", "."); // just format to string and form comma to sql-comma
}

20
Database-Attribute_System/Function.cs → Database-Attribute_System/internal/DbFunction.cs
Unescape Escape View File

@ -6,21 +6,9 @@ using System.Text;
namespace eu.railduction.netcore.dll.Database_Attribute_System
{
class Function
class DbFunction
{
public static string SqlEscape(string str)
{
string str_cpy = str.Replace(@"'", @"\'");
return str_cpy;
}
public static string SqlSerialise(DateTime dt)
{
return dt.ToString("yyyy-MM-dd HH:mm:ss");
}
public static object[] BuildKeyEqualQuery(Dictionary<string, object> keysets, string seperator)
internal static object[] BuildKeyEqualQuery(Dictionary<string, object> keysets, string seperator)
{
object[] param = new object[keysets.Count * 2];
int c = 0;
@ -43,13 +31,13 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
public static string GetDbTableName(Type classType)
{
// Check if class has attribute 'DbObject' and get the database table-name
if (!(classType.GetCustomAttribute(typeof(DbObject), true) is DbObject dbObjectAttribute)) throw new InvalidOperationException("Cannot generate SQL-Query of class. Missing Attribute 'DbObject'");
if (!(classType.GetCustomAttribute(typeof(DbObject), true) is DbObject dbObjectAttribute)) throw new InvalidOperationException($"Cannot generate SQL-Query of '{classType.Name}'. Missing Attribute 'DbObject'");
string tableName = dbObjectAttribute._tableName ?? classType.Name; // If no alternative table-name is specified, use the class-name
return tableName;
}
public static void ReadDbClassFields<T>(T classObject, ref Dictionary<string, object> dbPrimaryKeys, ref Dictionary<string, object> dbAttributes, ref Dictionary<string, object> dbForeignKeys)
internal static void ReadDbClassFields<T>(T classObject, ref Dictionary<string, object> dbPrimaryKeys, ref Dictionary<string, object> dbAttributes, ref Dictionary<string, object> dbForeignKeys)
{
Type classType = typeof(T);

34
Database-Attribute_System/internal/Function.cs
Unescape Escape View File

@ -0,0 +1,34 @@
using eu.railduction.netcore.dll.Database_Attribute_System.Attributes;
using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
namespace eu.railduction.netcore.dll.Database_Attribute_System
{
internal class Function
{
public static string SqlEscape(string str)
{
string str_cpy = str.Replace(@"'", @"\'");
return str_cpy;
}
public static string SqlSerialise(DateTime dt, string format = "yyyy-MM-dd HH:mm:ss")
{
return dt.ToString(format);
}
// Recursive object[] copying
internal static void RecursiveParameterCopying(ref List<object> paramz, object[] objects)
{
foreach (object obj in objects)
{
if (!(obj is object[]))
paramz.Add(obj);
else
RecursiveParameterCopying(ref paramz, (object[])obj);
}
}
}
}
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