選択できるのは25トピックまでです。
トピックは、先頭が英数字で、英数字とダッシュ('-')を使用した35文字以内のものにしてください。
136 行
3.7 KiB
136 行
3.7 KiB
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Data;
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using System.Data.Common;
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using System.Data.OleDb;
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using System.Data.SQLite;
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using System.Dynamic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Windows.Forms;
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namespace AppTime
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{
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class DB
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{
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public readonly static DB Instance = new DB();
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DbConnection conn;
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DbProviderFactory factory = SQLiteFactory.Instance;
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public DB()
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{
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var connectionString = new SQLiteConnectionStringBuilder()
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{
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DataSource= Path.Combine(Path.GetDirectoryName(Application.ExecutablePath), "data.db")
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}.ToString();
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conn = new SQLiteConnection
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{
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ConnectionString = connectionString
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};
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}
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T execute<T>(Func<DbCommand, T> handler, string sql, params object[] args)
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{
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lock (this)
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{
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conn.Open();
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using var cmd = conn.CreateCommand();
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cmd.CommandText = sql;
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for (var i = 0; i < args.Length; i++)
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{
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var arg = args[i];
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if (!(arg is DbParameter param))
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{
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param = factory.CreateParameter();
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param.ParameterName = $"@v{i}";
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param.Value = arg;
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}
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cmd.Parameters.Add(param);
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}
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var result = handler(cmd);
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conn.Close();
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return result;
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}
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}
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public int Execute(string sql, params object[] args)
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{
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return execute(cmd => cmd.ExecuteNonQuery(), sql, args) ;
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}
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public List<object[]> ExecuteData(string sql, params object[] args)
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{
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return execute(cmd =>
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{
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var result = new List<object[]>();
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using var reader = cmd.ExecuteReader();
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while (reader.Read())
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{
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var row = new object[reader.FieldCount];
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reader.GetValues(row);
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result.Add(row);
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}
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return result;
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}, sql, args);
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}
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public T ExecuteValue<T>(string sql, params object[] args)
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{
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return (T)Convert.ChangeType(ExecuteData(sql, args)[0][0], typeof(T));
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}
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public T[] ExecuteColumn<T>(string sql, params object[] args)
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{
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var data = ExecuteData(sql, args);
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var result = new T[data.Count];
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for(var i = 0;i<data.Count;i++)
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{
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result[i] = (T)Convert.ChangeType(data[i][0], typeof(T));
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}
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return result;
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}
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public DataTable ExecuteTable(string sql, params object[] args)
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{
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return execute(cmd =>
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{
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using var adapter = factory.CreateDataAdapter();
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adapter.SelectCommand = cmd;
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var result = new DataTable();
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adapter.Fill(result);
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return result;
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}, sql, args);
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}
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public IEnumerable<dynamic> ExecuteDynamic(string sql, params object[] args)
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{
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return from r in ExecuteTable(sql, args).AsEnumerable() select new DynamicDataRow(r);
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}
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}
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class DynamicDataRow : DynamicObject
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{
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DataRow row;
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public DynamicDataRow(DataRow row)
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{
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this.row = row;
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}
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public override bool TryGetMember(GetMemberBinder binder, out object result)
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{
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result = row[binder.Name];
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return true;
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}
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}
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}
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