/// <summary>
/// 找出 <paramref name="command"/> 脚本中定义的参数列表，并将参数列表加入其属性 Parameters 中。
/// </summary>
/// <param name="database">表示一个 <see cref="Microsoft.Practices.EnterpriseLibrary.Data.Database"/> 对象。</param>
/// <param name="command">用于查找参数列表的 <see cref="DbCommand"/> 对象。</param>
public static void DiscoverParameters(Database database, DbCommand command)
{
if (command.CommandType == CommandType.StoredProcedure)
{
database.DiscoverParameters(command);
return;
}
Check.NotEmpty(command.CommandText, "command.CommandText");
var parser = NDF.Data.Common.DbProviderFactoryExtensions.GetScriptParameterParser(database.DbProviderFactory);
string[] parameterNames = parser.GetParameterNames(command.CommandText);
foreach (var paremeterName in parameterNames)
{
DbParameter parameter = CreateParameter(database, paremeterName);
command.Parameters.Add(parameter);
}
}
/// <summary>
/// <para>
/// Populates the parameter collection for a command wrapper from the cache
/// or performs a round-trip to the database to query the parameters.
/// </para>
/// </summary>
/// <param name="command">
/// <para>The command to add the parameters.</para>
/// </param>
/// <param name="database">
/// <para>The database to use to set the parameters.</para>
/// </param>
public void SetParameters(DbCommand command, Database database)
{
if (command == null) throw new ArgumentNullException("command");
if (database == null) throw new ArgumentNullException("database");
if (AlreadyCached(command, database))
{
AddParametersFromCache(command, database);
}
else
{
database.DiscoverParameters(command);
IDataParameter[] copyOfParameters = CreateParameterCopy(command);
this.cache.AddParameterSetToCache(database.ConnectionString, command, copyOfParameters);
}
}
private static DbCommand PrepCommand(Database db, string procName, params object[] parameterVals)
{
DbCommand dbCommand = db.GetStoredProcCommand(procName);
dbCommand.CommandTimeout = 180;
db.DiscoverParameters(dbCommand);
int numVals = parameterVals.Length;
/// Start at 1; skip 0 which is RETURN_VALUE.
for (int i = 1; i < dbCommand.Parameters.Count; i++)
{
/// parameterVals should have same # elements, but index is offset by 1 compared to dbCommand.Parameters.
int valIndex = i - 1;
object value = valIndex < numVals ? parameterVals[valIndex] : null;
db.SetParameterValue(dbCommand, dbCommand.Parameters[i].ParameterName, value);
}
return dbCommand;
}
public void SetParameters(DbCommand command, Database database)
{
if (command == null)
{
throw new ArgumentNullException(nameof(command));
}
if (database == null)
{
throw new ArgumentNullException(nameof(database));
}
if (this.AlreadyCached((IDbCommand)command, database))
{
this.AddParametersFromCache(command, database);
}
else
{
database.DiscoverParameters(command);
IDataParameter[] parameterCopy = ParameterCache.CreateParameterCopy(command);
this.cache.AddParameterSetToCache(database.ConnectionString, (IDbCommand)command, parameterCopy);
}
}
public void SetParameters(DbCommand command, Database database)
{
if (command == null)
{
throw new ArgumentNullException("command");
}
if (database == null)
{
throw new ArgumentNullException("database");
}
if (AlreadyCached(command, database))
{
AddParametersFromCache(command, database);
}
else
{
database.DiscoverParameters(command);
IDataParameter[] copyOfParameters = CreateParameterCopy(command);
this.cache.AddParameterSetToCache(database.ConnectionString, command, copyOfParameters);
}
}
public DbCommand CreateSQLCommand(Database objDB, string SPName)
{
DbCommand objCommand = null;
try
{
if (SPName.Trim().Length > 0)
{
//Create Command object
objCommand = objDB.GetStoredProcCommand(SPName);
//Derive Parameters of SP
objDB.DiscoverParameters(objCommand);
// Assign the provided source columns to these parameters based on parameter order
for (int index = 0; index < objCommand.Parameters.Count; index++)
objCommand.Parameters[index].SourceColumn = objCommand.Parameters[index].ParameterName.Substring(1, objCommand.Parameters[index].ParameterName.Length - 1);
}
else
{
throw new Exception("Stored Procedure Name cannot be empty.");
}
}
catch (Exception ex)
{
ExceptionManager.Publish(ex);
throw ex;
}
return objCommand;
}
