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360 lines
14 KiB
360 lines
14 KiB
4 years ago
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Data.Common;
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using System.Data;
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using System.Reflection;
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using Common.AssemblyUtil;
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namespace Common.Data
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{
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/// <summary>
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/// 通用数据库访问类，封装了对数据库的常见操作
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/// </summary>
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public sealed class DbUtility
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{
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public string ConnectionString { get; set; }
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private DbProviderFactory providerFactory;
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="connectionString">数据库连接字符串</param>
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/// <param name="providerType">数据库类型枚举，参见<paramref name="providerType"/></param>
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public DbUtility(string connectionString, DbProviderType providerType)
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{
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ConnectionString = connectionString;
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providerFactory = ProviderFactory.GetDbProviderFactory(providerType);
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if (providerFactory == null)
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{
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throw new ArgumentException("无法确定数据源类型");
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}
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}
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/// <summary>
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/// 对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</param>
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/// <returns></returns>
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public int ExecuteNonQuery(string sql, IList<DbParameter> parameters)
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{
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return ExecuteNonQuery(sql, parameters, System.Data.CommandType.Text);
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}
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/// <summary>
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/// 对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</param>
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/// <param name="commandType">执行的SQL语句的类型</param>
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/// <returns></returns>
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public int ExecuteNonQuery(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType)
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{
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using (DbCommand command = CreateDbCommand(sql, parameters, commandType))
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{
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command.Connection.Open();
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int affectedRows = command.ExecuteNonQuery();
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command.Connection.Close();
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return affectedRows;
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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DataReader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</param>
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/// <returns></returns>
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private DbDataReader ExecuteReader(string sql, IList<DbParameter> parameters)
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{
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return ExecuteReader(sql, parameters, System.Data.CommandType.Text);
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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DataReader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</param>
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/// <param name="commandType">执行的SQL语句的类型</param>
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/// <returns></returns>
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private DbDataReader ExecuteReader(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType)
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{
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DbCommand command = CreateDbCommand(sql, parameters, commandType);
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command.Connection.Open();
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return command.ExecuteReader(CommandBehavior.CloseConnection);
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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</param>
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/// <returns></returns>
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private DataTable ExecuteDataTable(string sql, IList<DbParameter> parameters)
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{
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return ExecuteDataTable(sql, parameters, System.Data.CommandType.Text);
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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</param>
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/// <param name="commandType">执行的SQL语句的类型</param>
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/// <returns></returns>
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private DataTable ExecuteDataTable(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType)
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{
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using (DbCommand command = CreateDbCommand(sql, parameters, commandType))
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{
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using (DbDataAdapter adapter = providerFactory.CreateDataAdapter())
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{
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adapter.SelectCommand = command;
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DataTable data = new DataTable();
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adapter.Fill(data);
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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，返回查询结果的第一行第一列
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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</param>
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/// <returns></returns>
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public Object ExecuteScalar(string sql, IList<DbParameter> parameters)
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{
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return ExecuteScalar(sql, parameters, System.Data.CommandType.Text);
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}
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/// <summary>
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/// 执行一个查询语句，返回查询结果的第一行第一列
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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</param>
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/// <param name="commandType">执行的SQL语句的类型</param>
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/// <returns></returns>
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public Object ExecuteScalar(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType)
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{
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using (DbCommand command = CreateDbCommand(sql, parameters, commandType))
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{
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command.Connection.Open();
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object result = command.ExecuteScalar();
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command.Connection.Close();
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return result;
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}
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}
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/// <summary>
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/// 查询多个实体集合
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/// </summary>
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/// <typeparam name="T">返回的实体集合类型</typeparam>
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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</param>
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/// <returns></returns>
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public List<T> QueryForList<T>(string sql, IList<DbParameter> parameters) where T : new()
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{
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return QueryForList<T>(sql, parameters, System.Data.CommandType.Text);
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}
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/// <summary>
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///查询多个实体集合
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/// </summary>
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/// <typeparam name="T">返回的实体集合类型</typeparam>
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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</param>
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/// <param name="commandType">执行的SQL语句的类型</param>
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/// <returns></returns>
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public List<T> QueryForList<T>(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType) where T : new()
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{
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DataTable data = ExecuteDataTable(sql, parameters, commandType);
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return EntityFactory.GetEntities<T>(data);
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}
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/// <summary>
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/// 查询单个实体
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/// </summary>
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/// <typeparam name="T">返回的实体集合类型</typeparam>
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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</param>
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/// <returns></returns>
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public T QueryForObject<T>(string sql, IList<DbParameter> parameters) where T : new()
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{
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return QueryForObject<T>(sql, parameters, System.Data.CommandType.Text);
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}
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/// <summary>
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/// 查询单个实体
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/// </summary>
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/// <typeparam name="T">返回的实体集合类型</typeparam>
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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</param>
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/// <param name="commandType">执行的SQL语句的类型</param>
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/// <returns></returns>
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public T QueryForObject<T>(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType) where T : new()
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{
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return QueryForList<T>(sql, parameters, commandType)[0];
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}
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/// <summary>
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/// 创建参数
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/// </summary>
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/// <param name="name"></param>
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/// <param name="value"></param>
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/// <returns></returns>
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public DbParameter CreateDbParameter(string name, object value)
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{
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return CreateDbParameter(name, ParameterDirection.Input, value);
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}
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/// <summary>
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/// 创建参数
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/// </summary>
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/// <param name="name"></param>
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/// <param name="parameterDirection"></param>
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/// <param name="value"></param>
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/// <returns></returns>
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public DbParameter CreateDbParameter(string name, ParameterDirection parameterDirection, object value)
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{
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DbParameter parameter = providerFactory.CreateParameter();
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parameter.ParameterName = name;
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parameter.Value = value;
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parameter.Direction = parameterDirection;
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return parameter;
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}
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/// <summary>
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/// 创建一个DbCommand对象
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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</param>
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/// <param name="commandType">执行的SQL语句的类型</param>
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/// <returns></returns>
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private DbCommand CreateDbCommand(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType)
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{
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DbConnection connection = providerFactory.CreateConnection();
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DbCommand command = providerFactory.CreateCommand();
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connection.ConnectionString = ConnectionString;
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command.CommandText = sql;
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command.CommandType = commandType;
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command.Connection = connection;
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if (!(parameters == null || parameters.Count == 0))
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{
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foreach (DbParameter parameter in parameters)
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{
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command.Parameters.Add(parameter);
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}
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}
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return command;
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}
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}
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/// <summary>
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/// 数据库类型枚举
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/// </summary>
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public enum DbProviderType : byte
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{
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SqlServer,
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MySql,
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SQLite,
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Oracle,
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ODBC,
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OleDb,
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Firebird,
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PostgreSql,
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DB2,
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Informix,
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SqlServerCe
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}
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/// <summary>
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/// DbProviderFactory工厂类
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/// </summary>
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public class ProviderFactory
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{
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private static Dictionary<DbProviderType, string> providerInvariantNames = new Dictionary<DbProviderType, string>();
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private static Dictionary<DbProviderType, DbProviderFactory> providerFactoies = new Dictionary<DbProviderType, DbProviderFactory>(20);
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static ProviderFactory()
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{
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//加载已知的数据库访问类的程序集
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providerInvariantNames.Add(DbProviderType.SqlServer, "System.Data.SqlClient");
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providerInvariantNames.Add(DbProviderType.OleDb, "System.Data.OleDb");
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providerInvariantNames.Add(DbProviderType.ODBC, "System.Data.ODBC");
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providerInvariantNames.Add(DbProviderType.Oracle, "Oracle.DataAccess.Client");
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providerInvariantNames.Add(DbProviderType.MySql, "MySql.Data.MySqlClient");
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providerInvariantNames.Add(DbProviderType.SQLite, "System.Data.SQLite");
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providerInvariantNames.Add(DbProviderType.Firebird, "FirebirdSql.Data.Firebird");
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providerInvariantNames.Add(DbProviderType.PostgreSql, "Npgsql");
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providerInvariantNames.Add(DbProviderType.DB2, "IBM.Data.DB2.iSeries");
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providerInvariantNames.Add(DbProviderType.Informix, "IBM.Data.Informix");
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providerInvariantNames.Add(DbProviderType.SqlServerCe, "System.Data.SqlServerCe");
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}
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/// <summary>
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/// 获取指定数据库类型对应的程序集名称
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/// </summary>
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/// <param name="providerType">数据库类型枚举</param>
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/// <returns></returns>
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public static string GetProviderInvariantName(DbProviderType providerType)
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{
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return providerInvariantNames[providerType];
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}
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/// <summary>
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/// 获取指定类型的数据库对应的DbProviderFactory
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/// </summary>
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/// <param name="providerType">数据库类型枚举</param>
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/// <returns></returns>
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public static DbProviderFactory GetDbProviderFactory(DbProviderType providerType)
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{
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//如果还没有加载，则加载该DbProviderFactory
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if (!providerFactoies.ContainsKey(providerType))
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{
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providerFactoies.Add(providerType, ImportDbProviderFactory(providerType));
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}
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return providerFactoies[providerType];
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}
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/// <summary>
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/// 加载指定数据库类型的DbProviderFactory
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/// </summary>
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/// <param name="providerType">数据库类型枚举</param>
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/// <returns></returns>
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private static DbProviderFactory ImportDbProviderFactory(DbProviderType providerType)
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{
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string providerName = providerInvariantNames[providerType];
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DbProviderFactory factory = null;
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try
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{
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//从全局程序集中查找
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factory = DbProviderFactories.GetFactory(providerName);
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}
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catch (ArgumentException e)
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{
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factory = null;
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}
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return factory;
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}
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}
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/// <summary>
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/// 自定义属性，用于指示如何从DataTable或者DbDataReader中读取类的属性值
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/// </summary>
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public class ColumnNameAttribute : Attribute
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{
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||
|
|
/// <summary>
|
||
|
|
/// 类属性对应的列名
|
||
|
|
/// </summary>
|
||
|
|
public string ColumnName { get; set; }
|
||
|
|
/// <summary>
|
||
|
|
/// 构造函数
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="columnName">类属性对应的列名</param>
|
||
|
|
public ColumnNameAttribute(string columnName)
|
||
|
|
{
|
||
|
|
ColumnName = columnName;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|