To do the development, there are many years, and started going to row, just keep repeating the write ah SqlConnection, SqlCommand method ah ah, etc., write more it was very boring, so why not package them up and make it universal? Thus wondering started to package into library common method, only one purpose: the basic data layer general, database migration is not modified too much data layer code, not that simple data rewritable method of operation in the project, speed up development of the project. DevNet library thus formed.
Since DevNet library form, has been used in the project, recently thinking about how to enhance its function again, let her apply a wider range, suffer from experience, limited thinking, has not found a better way, it will be in detail DevNet description, experts were also invited to many valuable suggestions.
Found to be very poor writing skills, sad ah! Still further ado, just say the library.
First Disclaimer: The library method of drawing a lot of good ideas on the network, in this very grateful! Because drawing a lot of places, but now they can not list them, as found in the library using your ideas, but please bear with me!
To make common development libraries for multi-database, similar to DBHelper class is essential, but I made the abstract class, DBAccessBase.cs, the following is part of the code
/// <Summary>
/// common base class database access
/// </ summary>
// [LicenseProvider (typeof (DevNetLicenseProvider) )] // License, annotated class library
public class DBAccessBase
{
/// <Summary>
/// DataTable ExtendedProperties static properties
/// </ Summary>
Internal static String = C_PROP_SQL "SourceSQL";
/// <Summary>
/// connection object
/// </ Summary>
protected the DbConnection CON;
/// <Summary>
/// transaction object
/// </ Summary>
protected the DbTransaction Trans;
/// <summary>
/// 构造函数
/// </summary>
public DBAccessBase()
{
// DevNetLicenseProvider.ValidateLicense(typeof (DBConnect), this);
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="dbConnection">DbConnection</param>
public DBAccessBase(DbConnection dbConnection):this()
{
this.con = dbConnection;
}
/// <summary>
/// 析构函数
/// </summary>
~DBAccessBase()
{
con = null;
trans = null;
}
/// <summary>
/// 打开连接
/// </summary>
public virtual void Open()
{
if (con != null)
{
if (con.State == ConnectionState.Broken)
this.con.Close();
if(con.State == ConnectionState.Closed)
this.con.Open();
}
}
/// <summary>
/// 关闭连接
/// </summary>
public virtual void Close()
{
if (con != null && con.State != ConnectionState.Closed)
this.con.Close();
}
/// <summary>
/// 开始事务
/// </summary>
public virtual void BeginTransaction()
{
if (con == null || con.State == ConnectionState.Closed)
throw new Exception("Connection is Null or Not Open");
this.trans = this.con.BeginTransaction();
}
/// <summary>
/// 开始事务
/// </summary>
/// <param name="isoLationLevel">事务锁定行为</param>
public virtual void BeginTransaction(IsolationLevel isoLationLevel)
{
if (con == null || con.State == ConnectionState.Closed)
throw new Exception("Connection is Null or Not Open");
this.trans = this.con.BeginTransaction(isoLationLevel);
}
/// <summary>
/// 回滚事务
/// </summary>
public virtual void RollBackTransaction()
{
if (this.trans == null)
throw new Exception("Transaction Not Begin");
this.trans.Rollback();
this.trans.Dispose();
this.trans = null;
}
/// <summary>
/// 提交事务
/// </summary>
public virtual void CommitTransaction()
{
if (this.trans == null)
throw new Exception("Transaction Not Begin");
this.trans.Commit();
this.trans.Dispose();
this.trans = null;
}
/// <summary>
/// 创建参数
/// </summary>
/// <param name="cmd"></param>
/// <param name="parameterName"></param>
/// <param name="direction"></param>
/// <param name="paraType"></param>
/// <param name="size"></param>
/// <returns></returns>
public DbParameter CreateCmdParameter(DbCommand cmd, string parameterName, ParameterDirection direction, DbType paraType, int size)
{
DbParameter parameter = cmd.CreateParameter();
parameter.ParameterName = parameterName;
parameter.Direction = direction;
if (this.con is OleDbConnection && (paraType == DbType.DateTime))
{
((OleDbParameter)parameter).OleDbType = OleDbType.Date;
}
else
parameter.DbType = paraType;
parameter.Size = size;
return parameter;
}
/// <summary>
/// 创建参数
/// </summary>
/// <param name="cmd"></param>
/// <param name="parameterName"></param>
/// <param name="direction"></param>
/// <param name="paraType"></param>
/// <param name="size"></param>
/// <param name="Value"></param>
/// <returns></returns>
public DbParameter CreateCmdParameter(DbCommand cmd, string parameterName, ParameterDirection direction, DbType paraType, int size, object Value)
{
DbParameter parameter = this.CreateCmdParameter(cmd, parameterName, direction, paraType, size);
parameter.Value = Value;
return parameter;
}
/// <summary>
/// 增加一个参数
/// </summary>
/// <param name="cmd"></param>
/// <param name="paramName"></param>
/// <param name="paramValue"></param>
public virtual void AddCmdParamWithValue(DbCommand cmd, string paramName, object paramValue)
{
if (cmd is SqlCommand)
((SqlCommand)cmd).Parameters.AddWithValue(paramName, paramValue);
else if (cmd is OleDbCommand)
((OleDbCommand)cmd).Parameters.AddWithValue(paramName, paramValue);
else if (cmd is System.Data.OracleClient.OracleCommand)
((System.Data.OracleClient.OracleCommand)cmd).Parameters.AddWithValue(paramName, paramValue);
else if (cmd is MySqlDBAccess.MySqlCommand)
((MySqlDBAccess.MySqlCommand)cmd).Parameters.AddWithValue(paramName, paramValue);
else
throw new Exception("DbCommand Error!");
}
/// <summary>
/// 创建 DbCommandBuilder
/// </summary>
/// <param name="da"></param>
/// <returns></returns>
public virtual DbCommandBuilder CreateCommandBuilder(DbDataAdapter da)
{
if (da is SqlDataAdapter)
return new SqlCommandBuilder((SqlDataAdapter)da);
else if (da is OleDbDataAdapter)
return new OleDbCommandBuilder((OleDbDataAdapter)da);
else if (da is System.Data.OracleClient.OracleDataAdapter)
return new System.Data.OracleClient.OracleCommandBuilder((System.Data.OracleClient.OracleDataAdapter)da);
else if (da is MySqlDBAccess.MySqlDataAdapter)
return new MySqlDBAccess.MySqlCommandBuilder((MySqlDBAccess.MySqlDataAdapter)da);
return null;
}
/// <summary>
/// 创建 DbDataAdapter
/// </summary>
/// <param name="selectCmd">DbCommand</param>
/// <returns></returns>
public virtual DbDataAdapter CreateDbAdapter(DbCommand selectCmd)
{
if (selectCmd is SqlCommand)
return new SqlDataAdapter((SqlCommand)selectCmd);
else if (selectCmd is OleDbCommand)
return new OleDbDataAdapter((OleDbCommand)selectCmd);
else if (selectCmd is System.Data.OracleClient.OracleCommand)
return new System.Data.OracleClient.OracleDataAdapter((System.Data.OracleClient.OracleCommand)selectCmd);
else if (selectCmd is MySqlDBAccess.MySqlCommand)
return new MySqlDBAccess.MySqlDataAdapter((MySqlDBAccess.MySqlCommand)selectCmd);
return null;
}
/// <summary>
/// 创建DbDataAdapter
/// </summary>
/// <param name="selectCmd"></param>
/// <returns></returns>
public DbDataAdapter CreateDbAdapter(string selectCmd)
{
DbCommand dbCmd = this.PrepareCommand(CommandType.Text, selectCmd, null);
return this.CreateDbAdapter(dbCmd);
}
/// <summary>
/// 执行DbCommand
/// </summary>
/// <param name="selectCommand"></param>
/// <returns></returns>
public DataTable ExecuteDataTable(DbCommand selectCommand)
{
return this.ExecuteDataTable(selectCommand, null);
}
/// <summary>
/// 获取一个DataTable
/// </summary>
/// <param name="commandText"></param>
/// <returns></returns>
public DataTable ExecuteDataTable(string commandText)
{
return this.ExecuteDataTable(CommandType.Text, commandText, null);
}
/// <summary>
/// 获取一个DataTable
/// </summary>
/// <param name="selectCommand"></param>
/// <param name="srcTable"></param>
/// <returns></returns>
public virtual DataTable ExecuteDataTable(DbCommand selectCommand, string srcTable)
{
DataTable dataTable = new DataTable();
using (DbDataAdapter adapter = this.CreateDbAdapter(selectCommand))
{
adapter.Fill(dataTable);
dataTable.ExtendedProperties[C_PROP_SQL] = selectCommand.CommandText;
if (!String.IsNullOrEmpty(srcTable))
{
dataTable.TableName = srcTable;
}
}
return dataTable;
}
/// <summary>
/// 获取一个DataTable
/// </summary>
/// <param name="commandText"></param>
/// <param name="srcTable"></param>
/// <returns></returns>
public DataTable ExecuteDataTable(string commandText, string srcTable)
{
DataTable table = this.ExecuteDataTable(CommandType.Text, commandText, null);
if(!String.IsNullOrEmpty(srcTable))
table.TableName = srcTable;
return table;
}
/// <summary>
/// 获取指定记录数集合的表
/// </summary>
/// <param name="commandText"></param>
/// <param name="startIndex"></param>
/// <param name="maxRecords"></param>
/// <returns></returns>
public DataTable ExecuteDataTable(string commandText, int startIndex, int maxRecords)
{
DataTable dt;// = new DataTable();
using (DbCommand cmd = this.PrepareCommand(CommandType.Text, commandText, null))
{
dt = ExecuteDataTable(cmd, startIndex, maxRecords);
}
return dt;
}
/// <summary>
/// 获取指定记录数集合的表
/// </summary>
/// <param name="selectCmd"></param>
/// <param name="startIndex"></param>
/// <param name="maxRecords"></param>
/// <returns></returns>
public virtual DataTable ExecuteDataTable(DbCommand selectCmd, int startIndex, int maxRecords)
{
DataTable dt = new DataTable();
using (DbDataAdapter da = this.CreateDbAdapter(selectCmd))
{
da.Fill(startIndex, maxRecords, dt);
dt.ExtendedProperties[C_PROP_SQL] = selectCmd.CommandText;
}
return dt;
}
/// <summary>
/// 获取一个DataTable
/// </summary>
/// <param name="cmdType"></param>
/// <param name="cmdText"></param>
/// <param name="commandParameters"></param>
/// <returns></returns>
public virtual DataTable ExecuteDataTable(CommandType cmdType, string cmdText, params DbParameter[] commandParameters)
{
DataTable dataTable = new DataTable();
using(DbCommand selectCommand = this.PrepareCommand(cmdType, cmdText, commandParameters))
{
using (DbDataAdapter adapter = this.CreateDbAdapter(selectCommand))
{
adapter.Fill(dataTable);
dataTable.ExtendedProperties[C_PROP_SQL] = cmdText;
}
selectCommand.Parameters.Clear();
}
return dataTable;
}
/// <summary>
/// 执行ExecuteNonQuery
/// </summary>
/// <param name="cmdText"></param>
/// <returns></returns>
public int ExecuteNonQuery(string cmdText)
{
return this.ExecuteNonQuery(CommandType.Text, cmdText, null);
}
/// <summary>
/// 执行ExecuteNonQuery
/// </summary>
/// <param name="cmdType"></param>
/// <param name="cmdText"></param>
/// <param name="commandParameters"></param>
/// <returns></returns>
public int ExecuteNonQuery(CommandType cmdType, string cmdText, params DbParameter[] commandParameters)
{
using (DbCommand dbCmd = this.PrepareCommand(cmdType, cmdText, commandParameters))
{
int i = dbCmd.ExecuteNonQuery();
dbCmd.Parameters.Clear();
return i;
}
}
/// <summary>
/// 获取DbDataReader
/// </summary>
/// <param name="cmdText"></param>
/// <returns></returns>
public DbDataReader ExecuteReader(string cmdText)
{
return this.ExecuteReader(CommandType.Text, cmdText, null);
}
/// <summary>
/// 获取DbDataReader
/// </summary>
/// <param name="cmdType"></param>
/// <param name="cmdText"></param>
/// <param name="commandParameters"></param>
/// <returns></returns>
public DbDataReader ExecuteReader(CommandType cmdType, string cmdText, params DbParameter[] commandParameters)
{
return this.ExecuteReader(cmdType, cmdText, CommandBehavior.CloseConnection, commandParameters);
}
/// <summary>
/// 获取DbDataReader
/// </summary>
/// <param name="cmdType"></param>
/// <param name="cmdText"></param>
/// <param name="cmdBehavior"></param>
/// <param name="commandParameters"></param>
/// <returns></returns>
public DbDataReader ExecuteReader(CommandType cmdType, string cmdText,CommandBehavior cmdBehavior, params DbParameter[] commandParameters)
{
DbCommand dbCmd = this.PrepareCommand(cmdType, cmdText, commandParameters);
DbDataReader read = dbCmd.ExecuteReader(cmdBehavior);
dbCmd.Parameters.Clear();
return read;
}
/// <summary>
/// 获取ExecuteScalar
/// </summary>
/// <param name="cmdText"></param>
/// <returns></returns>
public object ExecuteScalar(string cmdText)
{
return this.ExecuteScalar(CommandType.Text, cmdText, null);
}
/// <summary>
/// 获取ExecuteScalar
/// </summary>
/// <param name="cmdType"></param>
/// <param name="cmdText"></param>
/// <param name="commandParameters"></param>
/// <returns></returns>
public object ExecuteScalar(CommandType cmdType, string cmdText, params DbParameter[] commandParameters)
{
using (DbCommand dbCmd = this.PrepareCommand(cmdType, cmdText, commandParameters))
{
object obj = dbCmd.ExecuteScalar();
dbCmd.Parameters.Clear();
return obj;
}
}
/// <summary>
/// 创建DbCommand
/// </summary>
/// <returns></returns>
public virtual DbCommand CreateCommand()
{
DbCommand cmd = this.con.CreateCommand();
if (this.trans != null)
cmd.Transaction = this.trans;
return cmd;
}
/// <summary>
/// 创建DbCommand
/// </summary>
/// <returns></returns>
public virtual DbCommand CreateCommand(string commandText)
{
DbCommand command = this.CreateCommand();
command.CommandText = commandText;
return command;
}
/// <summary>
///
/// </summary>
/// <param name="cmdType"></param>
/// <param name="cmdText"></param>
/// <param name="cmdParms"></param>
/// <returns></returns>
protected virtual DbCommand PrepareCommand(CommandType cmdType, string cmdText, params DbParameter[] cmdParms)
{
DbCommand command = this.CreateCommand(cmdText);
command.CommandType = cmdType;
if (cmdParms != null)
{
foreach (DbParameter parameter in cmdParms)
{
command.Parameters.Add(parameter);
}
}
return command;
}
/// <summary>
/// 更新DataTable
/// </summary>
/// <param name="dataTable"></param>
/// <returns></returns>
public int UpdateDataTable(DataTable dataTable)
{
return this.UpdateDataTable(dataTable, dataTable.TableName);
}
/// <summary>
/// 更新DataTable
/// </summary>
/// <param name="dataTable"></param>
/// <param name="srcTable"></param>
/// <returns></returns>
public virtual int UpdateDataTable(DataTable dataTable, string srcTable)
{
string cmdText = null;
if (dataTable.ExtendedProperties.Contains(C_PROP_SQL))
{
cmdText = dataTable.ExtendedProperties[C_PROP_SQL].ToString();
if (cmdText.IndexOf("select", StringComparison.OrdinalIgnoreCase) >= 0 && cmdText.IndexOf("from", StringComparison.OrdinalIgnoreCase) >= 0)
{
int index = cmdText.IndexOf(" where ", StringComparison.OrdinalIgnoreCase);
if (index > 0)
{
cmdText = cmdText.Substring(0, index);
}
goto Flag;
}
}
if (String.IsNullOrEmpty(srcTable) && String.IsNullOrEmpty(dataTable.TableName))
{
throw new Exception("没有设置TableName，或DataTable不是由DBConnect创建");
}
if (String.IsNullOrEmpty(srcTable))
srcTable = dataTable.TableName;
System.Text.StringBuilder builder = new System.Text.StringBuilder();
foreach (DataColumn column in dataTable.Columns)
{
builder.Append(",[");
builder.Append(column.ColumnName);
builder.Append("]");
}
builder.Append(" From ");
builder.Append(srcTable);
cmdText = "Select " + builder.ToString(1, builder.Length - 1);
Flag:
using (DbDataAdapter da = this.CreateDbAdapter(this.PrepareCommand(CommandType.Text, cmdText, null)))
{
if (da != null)
{
this.CreateCommandBuilder(da);
return da.Update(dataTable);
}
}
return -1;
}
/// <summary>
/// Return ConnectionState
/// </summary>
public virtual ConnectionState State
{
get{ return this.con.State; }
}
/// <summary>
/// Return or Set Connection's Trans
/// </summary>
public virtual DbTransaction Transaction
{
get { return this.trans; }
set { this.trans = value; }
}
/// <summary>
/// Return or Set DbConnection
/// </summary>
public virtual DbConnection DbConnection
{
get { return this.con; }
set { this.con = value; }
}
/// <summary>
/// 返回或设置连接的字符串
/// </summary>
public virtual string ConnectionString
{
get
{
if (con == null)
return string.Empty;
return this.con.ConnectionString;
}
set
{
if (this.con != null)
this.con.ConnectionString = value;
}
}
}
这个是该类库最底层的数据操作类了， 我想大家看了就明白了！
我把该类作为基类派生出SqlDbDirect.cs、OleDbDirect.cs、OracleDbDirect.cs和MySqlDbDirect.cs目前支持这几种数据库，数据库类型枚举：
/// <summary>
/// 数据库类型枚举
/// </summary>
public enum DBTypeEnum
{
/// <summary>
/// Sql DataBase 1
/// </summary>
SQL = 1,
/// <summary>
/// OleDb Access DataBase 2
/// </summary>
OleDb = 2,
/// <summary>
/// Oracle DataBase 3
/// </summary>
Oracle = 3,
/// <summary>
/// ADO Access DataBase 4
/// </summary>
ADO = 4,
/// <summary>
/// MySql DataBase 5
/// </summary>
MySql = 5
}
在以上基础上我封装了DBConnect.cs类，有兴趣的朋友可以查看帮助文档，该类进一步封装数据操作方法，增加编写代码的实用性和易操作性。贴上构造函数代码：
static readonly string Provider = ConfigurationManager.AppSettings["Provider"];
private DBAccessBase con = null;
/// <summary>
/// 构造函数
/// 配置文件
/// (appSettings)
/// add key="Provider" value="sql" (Sql,OleDb,Oracle,mysql )
/// add key="sql" value="Data Source=.;Initial Catalog=test;Persist Security Info=True;User ID=sa;Password=sa"
/// add key="oledb" value="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\sqldatabase\test.mdb"
/// (appSettings)
/// 无参数构造函数将自动创建连接
/// </summary>
public DBConnect()
{
if (String.IsNullOrEmpty(Provider))
{
return;
}
string conStr = GetConStr(); //根据配置文件获取连接字符串
if (!string.IsNullOrEmpty(conStr))
{
this.dbEnum = getDBEnum(); //获取数据库类型枚举
setConnect(conStr);
}
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="dataBaseEnum">数据库类型枚举</param>
/// <param name="connString">数据库的连接字符串</param>
public DBConnect(DBTypeEnum dataBaseEnum, string connString)
{
this.dbEnum = dataBaseEnum;
setConnect(connString);
}
setConnect void (String connString)
{
CON = DBFactory.GetDBConnection (this.dbEnum, connString); // use a unified database connection factory objects
the ConnectString = connString;
}
Configuration file settings as follows:
<appSettings>
<add key="Provider" value="sql" />
<add key="sql" value="Data Source=.;Initial Catalog=userinfo;Persist Security Info=True;User ID=sa;Password=sql" />
</appSettings>
So far, the underlying common data coding is completed, and also please more suggestions, next ScriptQuery.cs description and physical layer!
Download attachments: DevNet library and help documentation
Reproduced in: https: //www.cnblogs.com/sjfe_cn/archive/2010/11/07/DevNet.html