321 lines
10 KiB
C#
321 lines
10 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Data;
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using System.Data.SQLite;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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namespace MetroGauges
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{
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public class SQLiteHelper
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{
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private static string connectionString = string.Empty;
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private static string mapConfigSource = string.Empty;
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static SQLiteHelper()
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{
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string datasource = AppDomain.CurrentDomain.BaseDirectory + "Database\\metrogauges.db";
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connectionString = string.Format("Data Source={0};Version={1};password={2}", datasource, 3, "");
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}
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/// <summary>
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/// 创建一个数据库文件。如果存在同名数据库文件，则会覆盖。
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/// </summary>
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/// <param name="dbName">数据库文件名。为null或空串时不创建。</param>
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/// <param name="password">（可选）数据库密码，默认为空。</param>
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/// <exception cref="Exception"></exception>
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public static void CreateDB(string dbName)
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{
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if (!string.IsNullOrEmpty(dbName))
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{
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try { SQLiteConnection.CreateFile(dbName); }
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catch (Exception) { throw; }
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}
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}
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/// <summary>
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/// 对SQLite数据库执行增删改操作，返回受影响的行数。
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/// </summary>
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/// <param name="sql">要执行的增删改的SQL语句。</param>
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/// <param name="parameters">执行增删改语句所需要的参数，参数必须以它们在SQL语句中的顺序为准。</param>
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/// <returns></returns>
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/// <exception cref="Exception"></exception>
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public static int ExecuteNonQuery(string sql, params SQLiteParameter[] parameters)
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{
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int affectedRows = 0;
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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using (SQLiteCommand command = new SQLiteCommand(connection))
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{
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try
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{
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connection.Open();
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command.CommandText = sql;
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if (parameters.Length != 0)
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{
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command.Parameters.AddRange(parameters);
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}
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affectedRows = command.ExecuteNonQuery();
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}
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catch (Exception) { throw; }
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}
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}
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return affectedRows;
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}
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public static int ExecuteNonQuery(string sql)
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{
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int affectedRows = 0;
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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using (SQLiteCommand command = new SQLiteCommand(connection))
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{
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try
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{
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connection.Open();
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command.CommandText = sql;
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affectedRows = command.ExecuteNonQuery();
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}
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catch (Exception ex) {
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//throw;
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LogManager.WriteLog("error", "ExecuteNonQuery:" + ex.Message);
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}
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}
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}
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return affectedRows;
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}
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/// <summary>
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/// 批量处理数据操作语句。
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/// </summary>
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/// <param name="list">SQL语句集合。</param>
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/// <exception cref="Exception"></exception>
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public static void ExecuteNonQueryBatch(List<KeyValuePair<string, SQLiteParameter[]>> list, string mapconfigSource = null)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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try { connection.Open(); }
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catch { throw; }
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using (SQLiteTransaction tran = connection.BeginTransaction())
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{
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using (SQLiteCommand cmd = new SQLiteCommand(connection))
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{
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try
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{
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foreach (var item in list)
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{
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cmd.CommandText = item.Key;
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if (item.Value != null)
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{
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cmd.Parameters.AddRange(item.Value);
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}
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cmd.ExecuteNonQuery();
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}
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tran.Commit();
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}
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catch (Exception) { tran.Rollback(); throw; }
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}
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}
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}
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}
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/// <summary>
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/// 执行查询语句，并返回第一个结果。
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/// </summary>
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/// <param name="sql">查询语句。</param>
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/// <returns>查询结果。</returns>
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/// <exception cref="Exception"></exception>
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public static object ExecuteScalar(string sql, params SQLiteParameter[] parameters)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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using (SQLiteCommand cmd = new SQLiteCommand(connection))
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{
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try
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{
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connection.Open();
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cmd.CommandText = sql;
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if (parameters.Length != 0)
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{
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cmd.Parameters.AddRange(parameters);
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}
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return cmd.ExecuteScalar();
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}
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catch (Exception) { throw; }
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}
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}
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}
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/// <summary>
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/// 执行一个查询语句，返回一个包含查询结果的DataTable。
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/// </summary>
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/// <param name="sql">要执行的查询语句。</param>
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/// <param name="parameters">执行SQL查询语句所需要的参数，参数必须以它们在SQL语句中的顺序为准。</param>
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/// <returns></returns>
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/// <exception cref="Exception"></exception>
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public static DataTable ExecuteQuery(string sql, params SQLiteParameter[] parameters)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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using (SQLiteCommand command = new SQLiteCommand(sql, connection))
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{
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if (parameters.Length != 0)
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{
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command.Parameters.AddRange(parameters);
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}
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SQLiteDataAdapter adapter = new SQLiteDataAdapter(command);
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DataTable data = new DataTable();
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try { adapter.Fill(data); }
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catch (Exception ex) {
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//throw;
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LogManager.WriteLog("error", "ExecuteQuery:" + ex.Message);
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}
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return data;
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}
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}
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}
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public static DataTable ExecuteQuery(string sql)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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using (SQLiteCommand command = new SQLiteCommand(sql, connection))
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{
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connection.Open();
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command.CommandText = sql;
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SQLiteDataAdapter adapter = new SQLiteDataAdapter(command);
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DataTable data = new DataTable();
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try {
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adapter.Fill(data);
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}
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catch (Exception ex) {
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//throw;
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LogManager.WriteLog("error", "ExecuteQuery:" + ex.Message);
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}
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return data;
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}
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}
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}
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/// <summary>
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/// 执行一个查询语句，返回一个关联的SQLiteDataReader实例。
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/// </summary>
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/// <param name="sql">要执行的查询语句。</param>
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/// <param name="parameters">执行SQL查询语句所需要的参数，参数必须以它们在SQL语句中的顺序为准。</param>
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/// <returns></returns>
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/// <exception cref="Exception"></exception>
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public static SQLiteDataReader ExecuteReader(string sql, params SQLiteParameter[] parameters)
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{
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SQLiteConnection connection = new SQLiteConnection(connectionString);
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SQLiteCommand command = new SQLiteCommand(sql, connection);
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try
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{
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if (parameters.Length != 0)
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{
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command.Parameters.AddRange(parameters);
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}
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if(connection.State == ConnectionState.Closed)
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connection.Open();
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SQLiteDataReader reader= command.ExecuteReader(CommandBehavior.CloseConnection);
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return reader;
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}
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catch (Exception) { throw; }
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}
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/// <summary>
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/// 查询数据库中的所有数据类型信息。
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/// </summary>
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/// <returns></returns>
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/// <exception cref="Exception"></exception>
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public static DataTable GetSchema()
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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try
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{
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connection.Open();
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return connection.GetSchema("TABLES");
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}
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catch (Exception) { throw; }
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}
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}
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/// <summary>
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/// 填充对象列表：用DataTable填充实体类
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/// </summary>
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public static ObservableCollection<T> FillModel<T>(DataTable dt)
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{
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if (dt == null || dt.Rows.Count == 0)
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{
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return new ObservableCollection<T>();
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}
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ObservableCollection<T> modelList = new ObservableCollection<T>();
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foreach (DataRow dr in dt.Rows)
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{
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T model = (T)Activator.CreateInstance(typeof(T));
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//T model = new T();
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for (int i = 0; i < dr.Table.Columns.Count; i++)
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{
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string name = System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo.ToTitleCase(dr.Table.Columns[i].ColumnName);
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PropertyInfo propertyInfo = model.GetType().GetProperty(name);
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try
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{
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if (propertyInfo != null && dr[i] != DBNull.Value)
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propertyInfo.SetValue(model, dr[i], null);
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}
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catch (Exception ex)
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{
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//throw;
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LogManager.WriteLog("error", "FillModel:" + ex.Message);
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}
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}
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modelList.Add(model);
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}
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return modelList;
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}
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/// <summary>
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/// 填充对象：用DataRow填充实体类
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/// </summary>
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public static T FillModel<T>(DataRow dr)
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{
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if (dr == null)
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{
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return default(T);
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}
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T model = (T)Activator.CreateInstance(typeof(T));
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//T model = new T();
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for (int i = 0; i < dr.Table.Columns.Count; i++)
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{
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PropertyInfo propertyInfo = model.GetType().GetProperty(dr.Table.Columns[i].ColumnName);
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if (propertyInfo != null && dr[i] != DBNull.Value)
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propertyInfo.SetValue(model, dr[i], null);
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}
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return model;
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}
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}
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}
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