/// <summary>
/// 创建一个安全的数据库连接，执行sql指令，回调函数使用参数DataReader处理数据
/// </summary>
/// <param name="callBack"></param>
public void UsingSafeConnection(SQLiteString sql, Action <SQLiteDataReader> callBack)
{
using (SQLiteConnection con = new SQLiteConnection(this.DataSource))
{
con.Open();
using (SQLiteCommand com = new SQLiteCommand(con))
{
try
{
com.CommandText = sql.SqlText;
sql.SetCommand(com);
var reader = com.ExecuteReader();
callBack(reader);
reader.Close();
}
catch (Exception ex)
{
throw new Exception(string.Format("SQLite数据库[{0}]操作发生异常", this.DataSource), ex);
}
finally
{
con.Close();
con.Dispose();
}
}
}
}
/// <summary>
/// 执行sql，返回首行首列的值
/// </summary>
public string ExecuteScalar(SQLiteString sql)
{
string result = string.Empty;
this.UsingSafeConnection(com =>
{
com.CommandText = sql.SqlText;
sql.SetCommand(com);
result = com.ExecuteScalar().ToSafeString();
});
return(result);
}
/// <summary>
/// 执行Sql，返回受影响的行数
/// </summary>
public int ExecuteNonQuery(SQLiteString sql)
{
int result = 0;
this.UsingSafeConnection(com =>
{
com.CommandText = sql.SqlText;
sql.SetCommand(com);
result = com.ExecuteNonQuery();
});
return(result);
}
public void UsingExistingConnection(SQLiteString sql, Action <SQLiteDataReader> callBack)
{
using (SQLiteCommand com = new SQLiteCommand(this.ExistingConnection))
{
try
{
com.CommandText = sql.SqlText;
sql.SetCommand(com);
var reader = com.ExecuteReader();
callBack(reader);
}
catch (Exception ex)
{
throw new Exception(string.Format("SQLite数据库[{0}]操作发生异常", this.DataSource), ex);
}
}
}