public static void UpdateObject(
DbConnection conn,
object obj,
string tableName,
string[] idFieldNames,
string[] includeFields,
string[] excludeFields,
ObjectsChangeTracker changeTracker,
DbSettings dbSettings
)
{
using (DbCommand cmd = conn.CreateCommand())
{
if (
cmd.BuildUpdateCommand(
obj,
tableName,
idFieldNames,
includeFields,
excludeFields,
changeTracker,
dbSettings
)
)
{
cmd.ExecuteNonQuery();
}
}
}
public T ReadSingle(DbDataReader reader, ObjectsChangeTracker changeTracker)
{
T result = reader.Read() ? MapUsingState(reader, reader) : default(T);
if (changeTracker != null)
{
changeTracker.RegisterObject(result);
}
return(result);
}
public static void UpdateObject(
DbConnection conn,
object obj,
string tableName,
string[] idFieldNames,
ObjectsChangeTracker changeTracker,
DbSettings dbSettings
)
{
UpdateObject(conn, obj, tableName, idFieldNames, null, null, changeTracker, dbSettings);
}
public static T ToObject <T>(this DbDataReader reader, string readerName, string[] excludeFields,
ObjectsChangeTracker changeTracker)
{
T result = new DataReaderToObjectMapper <T>(readerName, null, excludeFields).MapUsingState(reader, reader);
if (changeTracker != null)
{
changeTracker.RegisterObject(result);
}
return(result);
}
public IEnumerable <T> ReadCollection(DbDataReader reader, ObjectsChangeTracker changeTracker)
{
while (reader.Read())
{
T result = MapUsingState(reader, reader);
if (changeTracker != null)
{
changeTracker.RegisterObject(result);
}
yield return(result);
}
reader.Close();
}
public static IEnumerable <T> ToObjects <T>(this DbDataReader reader, string readerName, string[] excludeFields,
ObjectsChangeTracker changeTracker)
{
if (string.IsNullOrEmpty(readerName))
{
var mappingKeyBuilder = new StringBuilder();
for (int i = 0; i < reader.FieldCount; ++i)
{
mappingKeyBuilder.Append(reader.GetName(i));
mappingKeyBuilder.Append(' ');
}
readerName = mappingKeyBuilder.ToString();
}
return(new DataReaderToObjectMapper <T>(readerName, null, excludeFields).ReadCollection(reader, changeTracker));
}
public static IEnumerable <T> ReadCollection <T>(
DbConnection conn,
string commandText,
CmdParams cmdParams,
string[] excludeFields,
ObjectsChangeTracker changeTracker,
Func <DbDataReader, T> func = null)
{
using (DbCommand cmd = CreateCommand(conn, commandText, cmdParams))
using (DbDataReader reader = cmd.ExecuteReader())
{
if (func == null)
{
func = (r => r.ToObject <T>(null, excludeFields, changeTracker));
}
while (reader.Read())
{
yield return(func(reader));
}
}
}
public static bool BuildUpdateCommand(
this DbCommand cmd,
object obj,
string tableName,
IEnumerable <string> idFieldNames,
IEnumerable <string> includeFields,
IEnumerable <string> excludeFields,
ObjectsChangeTracker changeTracker,
DbSettings dbSettings
)
{
if (idFieldNames == null)
{
idFieldNames = new string[0];
}
//idFieldNames = idFieldNames.Select(n => n.ToUpper()).ToArray(); //不Upper会怎样
if (changeTracker != null)
{
ObjectsChangeTracker.TrackingMember[] changedFields = changeTracker.GetChanges(obj);
if (changedFields != null)
{
includeFields = includeFields == null?changedFields.Select(c => c.name).Except(idFieldNames).ToArray()
: includeFields.Intersect(changedFields.Select(c => c.name)).Except(idFieldNames).ToArray();
}
}
if (includeFields != null)
{
includeFields = includeFields.Concat(idFieldNames);
}
IMappingConfigurator config = new AddDbCommandsMappingConfig(
dbSettings,
includeFields,
excludeFields,
"updateop_inc_" + includeFields.ToCSV("_") + "_exc_" + excludeFields.ToCSV("_")
);
ObjectsMapperBaseImpl mapper = ObjectMapperManager.DefaultInstance.GetMapperImpl(
obj.GetType(),
typeof(DbCommand),
config
);
string[] fields = mapper
.StroredObjects
.OfType <SrcReadOperation>()
.Select(m => m.Source.MemberInfo.Name)
.Where(f => !idFieldNames.Contains(f))
.Except(idFieldNames)
.ToArray(); //2014-4-29 cannot change id.
if (fields.Length == 0)
{
return(false);
}
var enableCol = new string[] { "TableName", "IdName" };
fields = fields.Where(c => !enableCol.Contains(c)).ToArray();
string cmdStr =
"UPDATE " +
tableName +
" SET " +
fields.Select(
f => dbSettings.GetEscapedName(f) + "=" + dbSettings.GetParamName(f)
)
.ToCSV(",") +
" WHERE " +
idFieldNames.Select(fn => dbSettings.GetEscapedName(fn) + "=" + dbSettings.GetParamName(fn))
.ToCSV(" AND ")
;
cmd.CommandText = cmdStr;
cmd.CommandType = CommandType.Text;
mapper.Map(obj, cmd, null);
return(true);
}