125 lines
4 KiB
C#
125 lines
4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Data;
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namespace TShockAPI.DB
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{
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public static class DbExt
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{
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/// <summary>
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/// Executes a query on a database.
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/// </summary>
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/// <param name="olddb">Database to query</param>
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/// <param name="query">Query string with parameters as @0, @1, etc.</param>
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/// <param name="args">Parameters to be put in the query</param>
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/// <returns>Rows affected by query</returns>
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public static int Query(this IDbConnection olddb, string query, params object[] args)
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{
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using (var db = olddb.CloneEx())
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{
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db.Open();
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using (var com = db.CreateCommand())
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{
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com.CommandText = query;
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for (int i = 0; i < args.Length; i++)
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com.AddParameter("@" + i, args[i]);
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return com.ExecuteNonQuery();
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}
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}
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}
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/// <summary>
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/// Executes a query on a database.
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/// </summary>
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/// <param name="olddb">Database to query</param>
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/// <param name="query">Query string with parameters as @0, @1, etc.</param>
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/// <param name="args">Parameters to be put in the query</param>
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/// <returns>Query result as IDataReader</returns>
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public static QueryResult QueryReader(this IDbConnection olddb, string query, params object[] args)
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{
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var db = olddb.CloneEx();
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db.Open();
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using (var com = db.CreateCommand())
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{
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com.CommandText = query;
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for (int i = 0; i < args.Length; i++)
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com.AddParameter("@" + i, args[i]);
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return new QueryResult(db, com.ExecuteReader());
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}
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}
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public static IDbDataParameter AddParameter(this IDbCommand command, string name, object data)
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{
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var parm = command.CreateParameter();
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parm.ParameterName = name;
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parm.Value = data;
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command.Parameters.Add(parm);
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return parm;
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}
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public static IDbConnection CloneEx(this IDbConnection conn)
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{
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var clone = (IDbConnection)Activator.CreateInstance(conn.GetType());
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clone.ConnectionString = conn.ConnectionString;
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return clone;
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}
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static Dictionary<Type, Func<IDataReader, int, object>> ReadFuncs = new Dictionary<Type, Func<IDataReader, int, object>>()
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{
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{typeof(bool), (s, i) => s.GetBoolean(i)},
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{typeof(byte), (s, i) => s.GetByte(i)},
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{typeof(Int16), (s, i) => s.GetInt16(i)},
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{typeof(Int32), (s, i) => s.GetInt32(i)},
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{typeof(Int64), (s, i) => s.GetInt64(i)},
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{typeof(string), (s, i) => s.GetString(i)},
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{typeof(decimal), (s, i) => s.GetDecimal(i)},
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{typeof(float), (s, i) => s.GetFloat(i)},
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{typeof(double), (s, i) => s.GetDouble(i)},
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};
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public static T Get<T>(this IDataReader reader, string column)
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{
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return reader.Get<T>(reader.GetOrdinal(column));
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}
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public static T Get<T>(this IDataReader reader, int column)
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{
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if (ReadFuncs.ContainsKey(typeof(T)))
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return (T)ReadFuncs[typeof(T)](reader, column);
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throw new NotImplementedException();
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}
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}
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public class QueryResult : IDisposable
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{
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public IDbConnection Connection { get; protected set; }
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public IDataReader Reader { get; protected set; }
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public QueryResult(IDbConnection conn, IDataReader reader)
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{
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Connection = conn;
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Reader = reader;
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}
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public void Dispose()
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{
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Reader.Dispose();
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Connection.Dispose();
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}
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public bool Read()
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{
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return Reader.Read();
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}
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public T Get<T>(string column)
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{
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return Reader.Get<T>(Reader.GetOrdinal(column));
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}
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}
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}
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