You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
360 lines
14 KiB
360 lines
14 KiB
3 years ago
|
using System;
|
||
|
|
using System.Collections.Generic;
|
||
|
|
using System.Linq;
|
||
|
|
using System.Text;
|
||
|
|
using System.Data.Common;
|
||
|
|
using System.Data;
|
||
|
|
using System.Reflection;
|
||
|
|
using Common.AssemblyUtil;
|
||
|
|
|
||
|
|
namespace Common.Data
|
||
|
|
{
|
||
|
|
/// <summary>
|
||
|
|
/// 通用数据库访问类，封装了对数据库的常见操作
|
||
|
|
/// </summary>
|
||
|
|
public sealed class DbUtility
|
||
|
|
{
|
||
|
|
public string ConnectionString { get; set; }
|
||
|
|
private DbProviderFactory providerFactory;
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 构造函数
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="connectionString">数据库连接字符串</param>
|
||
|
|
/// <param name="providerType">数据库类型枚举，参见<paramref name="providerType"/></param>
|
||
|
|
public DbUtility(string connectionString, DbProviderType providerType)
|
||
|
|
{
|
||
|
|
ConnectionString = connectionString;
|
||
|
|
providerFactory = ProviderFactory.GetDbProviderFactory(providerType);
|
||
|
|
if (providerFactory == null)
|
||
|
|
{
|
||
|
|
throw new ArgumentException("无法确定数据源类型");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 对数据库执行增删改操作，返回受影响的行数。
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="sql">要执行的增删改的SQL语句</param>
|
||
|
|
/// <param name="parameters">执行增删改语句所需要的参数</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public int ExecuteNonQuery(string sql, IList<DbParameter> parameters)
|
||
|
|
{
|
||
|
|
return ExecuteNonQuery(sql, parameters, System.Data.CommandType.Text);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 对数据库执行增删改操作，返回受影响的行数。
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="sql">要执行的增删改的SQL语句</param>
|
||
|
|
/// <param name="parameters">执行增删改语句所需要的参数</param>
|
||
|
|
/// <param name="commandType">执行的SQL语句的类型</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public int ExecuteNonQuery(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType)
|
||
|
|
{
|
||
|
|
using (DbCommand command = CreateDbCommand(sql, parameters, commandType))
|
||
|
|
{
|
||
|
|
command.Connection.Open();
|
||
|
|
int affectedRows = command.ExecuteNonQuery();
|
||
|
|
command.Connection.Close();
|
||
|
|
return affectedRows;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 执行一个查询语句，返回一个关联的DataReader实例
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="sql">要执行的查询语句</param>
|
||
|
|
/// <param name="parameters">执行SQL查询语句所需要的参数</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
private DbDataReader ExecuteReader(string sql, IList<DbParameter> parameters)
|
||
|
|
{
|
||
|
|
return ExecuteReader(sql, parameters, System.Data.CommandType.Text);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 执行一个查询语句，返回一个关联的DataReader实例
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="sql">要执行的查询语句</param>
|
||
|
|
/// <param name="parameters">执行SQL查询语句所需要的参数</param>
|
||
|
|
/// <param name="commandType">执行的SQL语句的类型</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
private DbDataReader ExecuteReader(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType)
|
||
|
|
{
|
||
|
|
DbCommand command = CreateDbCommand(sql, parameters, commandType);
|
||
|
|
command.Connection.Open();
|
||
|
|
return command.ExecuteReader(CommandBehavior.CloseConnection);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 执行一个查询语句，返回一个包含查询结果的DataTable
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="sql">要执行的查询语句</param>
|
||
|
|
/// <param name="parameters">执行SQL查询语句所需要的参数</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
private DataTable ExecuteDataTable(string sql, IList<DbParameter> parameters)
|
||
|
|
{
|
||
|
|
return ExecuteDataTable(sql, parameters, System.Data.CommandType.Text);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 执行一个查询语句，返回一个包含查询结果的DataTable
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="sql">要执行的查询语句</param>
|
||
|
|
/// <param name="parameters">执行SQL查询语句所需要的参数</param>
|
||
|
|
/// <param name="commandType">执行的SQL语句的类型</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
private DataTable ExecuteDataTable(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType)
|
||
|
|
{
|
||
|
|
using (DbCommand command = CreateDbCommand(sql, parameters, commandType))
|
||
|
|
{
|
||
|
|
using (DbDataAdapter adapter = providerFactory.CreateDataAdapter())
|
||
|
|
{
|
||
|
|
adapter.SelectCommand = command;
|
||
|
|
DataTable data = new DataTable();
|
||
|
|
adapter.Fill(data);
|
||
|
|
return data;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 执行一个查询语句，返回查询结果的第一行第一列
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="sql">要执行的查询语句</param>
|
||
|
|
/// <param name="parameters">执行SQL查询语句所需要的参数</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public Object ExecuteScalar(string sql, IList<DbParameter> parameters)
|
||
|
|
{
|
||
|
|
return ExecuteScalar(sql, parameters, System.Data.CommandType.Text);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 执行一个查询语句，返回查询结果的第一行第一列
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="sql">要执行的查询语句</param>
|
||
|
|
/// <param name="parameters">执行SQL查询语句所需要的参数</param>
|
||
|
|
/// <param name="commandType">执行的SQL语句的类型</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public Object ExecuteScalar(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType)
|
||
|
|
{
|
||
|
|
using (DbCommand command = CreateDbCommand(sql, parameters, commandType))
|
||
|
|
{
|
||
|
|
command.Connection.Open();
|
||
|
|
object result = command.ExecuteScalar();
|
||
|
|
command.Connection.Close();
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 查询多个实体集合
|
||
|
|
/// </summary>
|
||
|
|
/// <typeparam name="T">返回的实体集合类型</typeparam>
|
||
|
|
/// <param name="sql">要执行的查询语句</param>
|
||
|
|
/// <param name="parameters">执行SQL查询语句所需要的参数</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public List<T> QueryForList<T>(string sql, IList<DbParameter> parameters) where T : new()
|
||
|
|
{
|
||
|
|
return QueryForList<T>(sql, parameters, System.Data.CommandType.Text);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
///查询多个实体集合
|
||
|
|
/// </summary>
|
||
|
|
/// <typeparam name="T">返回的实体集合类型</typeparam>
|
||
|
|
/// <param name="sql">要执行的查询语句</param>
|
||
|
|
/// <param name="parameters">执行SQL查询语句所需要的参数</param>
|
||
|
|
/// <param name="commandType">执行的SQL语句的类型</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public List<T> QueryForList<T>(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType) where T : new()
|
||
|
|
{
|
||
|
|
DataTable data = ExecuteDataTable(sql, parameters, commandType);
|
||
|
|
return EntityFactory.GetEntities<T>(data);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 查询单个实体
|
||
|
|
/// </summary>
|
||
|
|
/// <typeparam name="T">返回的实体集合类型</typeparam>
|
||
|
|
/// <param name="sql">要执行的查询语句</param>
|
||
|
|
/// <param name="parameters">执行SQL查询语句所需要的参数</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public T QueryForObject<T>(string sql, IList<DbParameter> parameters) where T : new()
|
||
|
|
{
|
||
|
|
return QueryForObject<T>(sql, parameters, System.Data.CommandType.Text);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 查询单个实体
|
||
|
|
/// </summary>
|
||
|
|
/// <typeparam name="T">返回的实体集合类型</typeparam>
|
||
|
|
/// <param name="sql">要执行的查询语句</param>
|
||
|
|
/// <param name="parameters">执行SQL查询语句所需要的参数</param>
|
||
|
|
/// <param name="commandType">执行的SQL语句的类型</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public T QueryForObject<T>(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType) where T : new()
|
||
|
|
{
|
||
|
|
return QueryForList<T>(sql, parameters, commandType)[0];
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 创建参数
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="name"></param>
|
||
|
|
/// <param name="value"></param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public DbParameter CreateDbParameter(string name, object value)
|
||
|
|
{
|
||
|
|
return CreateDbParameter(name, ParameterDirection.Input, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 创建参数
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="name"></param>
|
||
|
|
/// <param name="parameterDirection"></param>
|
||
|
|
/// <param name="value"></param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public DbParameter CreateDbParameter(string name, ParameterDirection parameterDirection, object value)
|
||
|
|
{
|
||
|
|
DbParameter parameter = providerFactory.CreateParameter();
|
||
|
|
parameter.ParameterName = name;
|
||
|
|
parameter.Value = value;
|
||
|
|
parameter.Direction = parameterDirection;
|
||
|
|
return parameter;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 创建一个DbCommand对象
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="sql">要执行的查询语句</param>
|
||
|
|
/// <param name="parameters">执行SQL查询语句所需要的参数</param>
|
||
|
|
/// <param name="commandType">执行的SQL语句的类型</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
private DbCommand CreateDbCommand(string sql, IList<DbParameter> parameters, System.Data.CommandType commandType)
|
||
|
|
{
|
||
|
|
DbConnection connection = providerFactory.CreateConnection();
|
||
|
|
DbCommand command = providerFactory.CreateCommand();
|
||
|
|
connection.ConnectionString = ConnectionString;
|
||
|
|
command.CommandText = sql;
|
||
|
|
command.CommandType = commandType;
|
||
|
|
command.Connection = connection;
|
||
|
|
if (!(parameters == null || parameters.Count == 0))
|
||
|
|
{
|
||
|
|
foreach (DbParameter parameter in parameters)
|
||
|
|
{
|
||
|
|
command.Parameters.Add(parameter);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return command;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/// <summary>
|
||
|
|
/// 数据库类型枚举
|
||
|
|
/// </summary>
|
||
|
|
public enum DbProviderType : byte
|
||
|
|
{
|
||
|
|
SqlServer,
|
||
|
|
MySql,
|
||
|
|
SQLite,
|
||
|
|
Oracle,
|
||
|
|
ODBC,
|
||
|
|
OleDb,
|
||
|
|
Firebird,
|
||
|
|
PostgreSql,
|
||
|
|
DB2,
|
||
|
|
Informix,
|
||
|
|
SqlServerCe
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// DbProviderFactory工厂类
|
||
|
|
/// </summary>
|
||
|
|
public class ProviderFactory
|
||
|
|
{
|
||
|
|
private static Dictionary<DbProviderType, string> providerInvariantNames = new Dictionary<DbProviderType, string>();
|
||
|
|
private static Dictionary<DbProviderType, DbProviderFactory> providerFactoies = new Dictionary<DbProviderType, DbProviderFactory>(20);
|
||
|
|
|
||
|
|
static ProviderFactory()
|
||
|
|
{
|
||
|
|
//加载已知的数据库访问类的程序集
|
||
|
|
providerInvariantNames.Add(DbProviderType.SqlServer, "System.Data.SqlClient");
|
||
|
|
providerInvariantNames.Add(DbProviderType.OleDb, "System.Data.OleDb");
|
||
|
|
providerInvariantNames.Add(DbProviderType.ODBC, "System.Data.ODBC");
|
||
|
|
providerInvariantNames.Add(DbProviderType.Oracle, "Oracle.DataAccess.Client");
|
||
|
|
providerInvariantNames.Add(DbProviderType.MySql, "MySql.Data.MySqlClient");
|
||
|
|
providerInvariantNames.Add(DbProviderType.SQLite, "System.Data.SQLite");
|
||
|
|
providerInvariantNames.Add(DbProviderType.Firebird, "FirebirdSql.Data.Firebird");
|
||
|
|
providerInvariantNames.Add(DbProviderType.PostgreSql, "Npgsql");
|
||
|
|
providerInvariantNames.Add(DbProviderType.DB2, "IBM.Data.DB2.iSeries");
|
||
|
|
providerInvariantNames.Add(DbProviderType.Informix, "IBM.Data.Informix");
|
||
|
|
providerInvariantNames.Add(DbProviderType.SqlServerCe, "System.Data.SqlServerCe");
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 获取指定数据库类型对应的程序集名称
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="providerType">数据库类型枚举</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public static string GetProviderInvariantName(DbProviderType providerType)
|
||
|
|
{
|
||
|
|
return providerInvariantNames[providerType];
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 获取指定类型的数据库对应的DbProviderFactory
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="providerType">数据库类型枚举</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public static DbProviderFactory GetDbProviderFactory(DbProviderType providerType)
|
||
|
|
{
|
||
|
|
//如果还没有加载，则加载该DbProviderFactory
|
||
|
|
if (!providerFactoies.ContainsKey(providerType))
|
||
|
|
{
|
||
|
|
providerFactoies.Add(providerType, ImportDbProviderFactory(providerType));
|
||
|
|
}
|
||
|
|
return providerFactoies[providerType];
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 加载指定数据库类型的DbProviderFactory
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="providerType">数据库类型枚举</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
private static DbProviderFactory ImportDbProviderFactory(DbProviderType providerType)
|
||
|
|
{
|
||
|
|
string providerName = providerInvariantNames[providerType];
|
||
|
|
DbProviderFactory factory = null;
|
||
|
|
try
|
||
|
|
{
|
||
|
|
//从全局程序集中查找
|
||
|
|
factory = DbProviderFactories.GetFactory(providerName);
|
||
|
|
}
|
||
|
|
catch (ArgumentException e)
|
||
|
|
{
|
||
|
|
factory = null;
|
||
|
|
}
|
||
|
|
return factory;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 自定义属性，用于指示如何从DataTable或者DbDataReader中读取类的属性值
|
||
|
|
/// </summary>
|
||
|
|
public class ColumnNameAttribute : Attribute
|
||
|
|
{
|
||
|
|
/// <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;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|