Class-Object now has to be passed
Will get the value of the object Added DeleteByPrimaryKey
This commit is contained in:
Alexander B
parent
248be3320f
commit
803b7b7b95
@ -1,5 +1,7 @@
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using System;
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using eu.railduction.netcore.dll.Database_Attribute_System.Attributes;
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Text;
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namespace eu.railduction.netcore.dll.Database_Attribute_System
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@ -16,5 +18,69 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
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{
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return dt.ToString("yyyy-MM-dd HH:mm:ss");
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}
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public static object[] BuildKeyEqualQuery(Dictionary<string, object> keysets, string seperator)
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{
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object[] param = new object[keysets.Count * 2];
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int c = 0;
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foreach (KeyValuePair<string, object> keyset in keysets)
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{
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string sql_string = "";
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if (c != 0) sql_string += seperator;
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sql_string += $"{keyset.Key}=";
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param[c] = sql_string;
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param[c + 1] = keyset.Value;
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c += 2;
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}
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return param;
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}
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public static string GetDbTableName(Type classType)
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{
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// Check if class has attribute 'DbObject' and get the database table-name
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if (!(classType.GetCustomAttribute(typeof(DbObject), true) is DbObject dbObjectAttribute)) throw new InvalidOperationException("Cannot generate SQL-Query of class. Missing Attribute 'DbObject'");
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string tableName = dbObjectAttribute._tableName ?? classType.Name; // If no alternative table-name is specified, use the class-name
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return tableName;
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}
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public static void ReadDbClassFields<T>(T classObject, ref Dictionary<string, object> dbPrimaryKeys, ref Dictionary<string, object> dbAttributes, ref Dictionary<string, object> dbForeignKeys)
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{
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Type classType = T.GetType();
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// Reset lists (just in case)
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dbPrimaryKeys = new Dictionary<string, object> () { };
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dbAttributes = new Dictionary<string, object>() { };
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dbForeignKeys = new Dictionary<string, object>() { };
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// Iterate thru all properties
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foreach (System.Reflection.FieldInfo fi in classType.GetRuntimeFields())
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{
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// Check if current field is a db-field
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if (fi.GetCustomAttribute(typeof(DbPrimaryKey), true) is DbPrimaryKey pkey) // PrimaryKey
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{
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string dbAttributeName = pkey._attributeName ?? fi.Name; // If no alternative attribute-name is specified, use the property-name
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object value = fi.GetValue(classObject);
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dbPrimaryKeys.Add(dbAttributeName, value);
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}
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else if (fi.GetCustomAttribute(typeof(DbAttribute), true) is DbAttribute att) // Attributes
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{
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string dbAttributeName = att._attributeName ?? fi.Name; // If no alternative attribute-name is specified, use the property-name
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object value = fi.GetValue(classObject);
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dbAttributes.Add(dbAttributeName, value);
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}
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else if (fi.GetCustomAttribute(typeof(DbForeignKey), true) is DbForeignKey fkey) // ForeignKeys
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{
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string dbAttributeName = fkey._attributeName ?? fi.Name; // If no alternative attribute-name is specified, use the property-name
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object value = fi.GetValue(classObject);
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dbForeignKeys.Add(dbAttributeName, value);
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}
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}
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}
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}
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}
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@ -7,59 +7,86 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
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{
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public class QueryBuilder
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{
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/// <summary>
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/// Build an SELECT-SQL-query by a database-primary-key<pragma/>
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/// Will build the query-string based on the <paramref name="comparisonValue"/> including serialising and escaping for SQL.<para/>
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/// </summary>
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/// <param name="handler">Method to send querys to the database</param>
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/// <param name="primaryKey">Database comparison value</param>
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/// <returns>Built SQL-Query</returns>
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public static string SelectByPrimaryKey(Type classType, object comparisonValue) => SelectByPrimaryKeys(classType, comparisonValue);
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/// <summary>
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/// Build an SELECT-SQL-query by database-primary-keys<pragma/>
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/// Will build the query-string based on the <paramref name="comparisonValues"/> including serialising and escaping for SQL.<para/>
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/// </summary>
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/// <param name="handler">Method to send querys to the database</param>
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/// <param name="primaryKeys">Database comparison values (Must be the exact same amount as primary keys in class/table)</param>
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/// <returns>Built SQL-Query</returns>
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public static string SelectByPrimaryKeys(Type classType, params object[] comparisonValues)
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public static string SelectByPrimaryKeys<T>(T classObject)
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{
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// Check if class has attribute 'DbObject' and get the database table-name
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if (!(classType.GetCustomAttribute(typeof(DbObject), true) is DbObject dbObjectAttribute)) throw new InvalidOperationException("Cannot generate SQL-Query of class. Missing Attribute 'DbObject'");
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string tableName = dbObjectAttribute._tableName ?? classType.Name; // If no alternative table-name is specified, use the class-name
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Type classType = classObject.GetType();
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// Iterate thru all properties
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List<string> dbPrimaryKeys = new List<string>() { };
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foreach (System.Reflection.FieldInfo fi in classType.GetRuntimeFields())
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{
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// Get primaryKey attribute from current property
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if (fi.GetCustomAttribute(typeof(DbPrimaryKey), true) is DbPrimaryKey pkey)
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{
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string dbAttributeName = pkey._attributeName ?? fi.Name; // If no alternative attribute-name is specified, use the property-name
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dbPrimaryKeys.Add(dbAttributeName);
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}
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}
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// Get db-table-name from class
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string tableName = Function.GetDbTableName(classType);
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if (comparisonValues.Length != dbPrimaryKeys.Count) throw new InvalidOperationException("Primary-key number of class/table and number of comparison values is not equal!");
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object[] param = new object[comparisonValues.Length * 2];
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for (int i = 0, c = 0; c < param.Length; i++, c += 2)
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{
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string sql_string = "";
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if (i == 0) sql_string += $"SELECT * FROM {tableName} WHERE ";
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else sql_string += " AND ";
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sql_string += $"{dbPrimaryKeys[i]}=";
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param[c] = sql_string;
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param[c + 1] = comparisonValues[i];
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}
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// Get class db-fields
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Dictionary<string, object> dbPrimaryKeys = new Dictionary<string, object>() { };
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Dictionary<string, object> dbAttributes = new Dictionary<string, object>() { };
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Dictionary<string, object> dbForeignKeys = new Dictionary<string, object>() { };
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Function.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
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// Build where statements with primaryKey/s
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object[] param = Function.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
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// Add SQL-command part
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param[0] += $"SELECT * FROM {tableName} WHERE ";
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// Build and return the query
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return BuildQuery(param);
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}
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public static string UpdateByPrimaryKeys<T>(T classObject)
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{
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Type classType = classObject.GetType();
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// Get db-table-name from class
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string tableName = Function.GetDbTableName(classType);
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// Get class db-fields
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Dictionary<string, object> dbPrimaryKeys = new Dictionary<string, object>() { };
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Dictionary<string, object> dbAttributes = new Dictionary<string, object>() { };
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Dictionary<string, object> dbForeignKeys = new Dictionary<string, object>() { };
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Function.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
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// Add foreign-keys to attributes
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foreach(KeyValuePair<string, object> dbForeignKey in dbForeignKeys)
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{
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dbAttributes.Add(dbForeignKey.Key, dbForeignKey.Value);
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}
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// Build set-parameters
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object[] paramSet = Function.BuildKeyEqualQuery(dbAttributes, ", ");
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// Add SQL-command part
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paramSet[0] += $"UPDATE {tableName} SET ";
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// Build where-parameters
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object[] paramWhere = Function.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
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// Add SQL-command part
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paramWhere[0] += " WHERE ";
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// Build and return the query
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return BuildQuery(paramSet, paramWhere);
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}
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public static string DeleteByPrimaryKeys<T>(T classObject)
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{
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Type classType = classObject.GetType();
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// Get db-table-name from class
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string tableName = Function.GetDbTableName(classType);
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// Get class db-fields
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Dictionary<string, object> dbPrimaryKeys = new Dictionary<string, object>() { };
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Dictionary<string, object> dbAttributes = new Dictionary<string, object>() { };
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Dictionary<string, object> dbForeignKeys = new Dictionary<string, object>() { };
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Function.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
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// Build where-parameters
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object[] paramWhere = Function.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
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// Add SQL-command part
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paramWhere[0] += $"DELETE FROM {tableName} WHERE ";
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// Build and return the query
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return BuildQuery(paramWhere);
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}
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/// <summary>
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/// Build an SQL-query<para/>
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/// Will build the query-string based on the <paramref name="param"/>s including serialising and escaping for SQL.<para/>
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