我目前正在为我的班级使用hilo id生成器,但刚刚使用了最少的设置,例如
<class name="ClassA">
<id name="Id" column="id" unsaved-value="0">
<generator class="hilo" />
</id>
...
但是我真的要为NHibernate指定一个新列来使用foreach实体并为它提供最大值吗?
<class name="ClassA">
<id name="Id" column="id" unsaved-value="0">
<generator class="hilo">
<param name="table">hibernate_unique_key</param>
<param name="column">classA_nexthi</param>
<param name="max_lo">20</param>
</generator>
</id>
...
<class name="ClassB">
<id name="Id" column="id" unsaved-value="0">
<generator class="hilo">
<param name="table">hibernate_unique_key</param>
<param name="column">classB_nexthi</param>
<param name="max_lo">20</param>
</generator>
</id>
...
另外我注意到,当我执行上述操作时,SchemaExport不会创建所有列 - 只有classB_nexthi,还有其他我做错了。
答案 0 :(得分:2)
我再次问了这个问题,但是在nhusers小组中,请看response我得到了
答案 1 :(得分:1)
你是怎么解决这个问题的?我实现了你自己的idgenerator?
我做了,现在可能有点脏,但无论如何:
public class TableHiLoGeneratorWithMultipleColumns : NHibernate.Id.TableHiLoGenerator
{
static HashSet<string> tables = new HashSet<string>();
public override void Configure(IType type, IDictionary<string, string> parms, Dialect dialect)
{
string table;
if (parms.ContainsKey("target_table"))
{
table = parms["target_table"];
tables.Add(table);
parms["column"] = string.Format("{0}_{1}", DefaultColumnName, table);
}
base.Configure(type, parms, dialect);
}
public override string[] SqlCreateStrings(Dialect dialect)
{
string createTableTemplate = "create table " + DefaultTableName + "({0})";
string insertInitialValuesTemplate = "insert into " + DefaultTableName + "({0})" + " values ( {1} )";
StringBuilder createTables = new StringBuilder();
StringBuilder columns = new StringBuilder();
StringBuilder inserts = new StringBuilder();
StringBuilder initialInsert = new StringBuilder();
StringBuilder insertsValues = new StringBuilder();
foreach (string table in tables)
{
columns.AppendFormat("{0}_{1} {2},", DefaultColumnName, table, dialect.GetTypeName(columnSqlType));
inserts.AppendFormat("{0}_{1},", DefaultColumnName, table);
insertsValues.Append("1, ");
}
columns.Remove(columns.Length - 1, 1);
inserts.Remove(inserts.Length - 1, 1);
createTables.AppendFormat(createTableTemplate, columns);
insertsValues.Remove(insertsValues.Length - 2, 2);
initialInsert.AppendFormat(insertInitialValuesTemplate, inserts, insertsValues);
return new[] { createTables.ToString(), initialInsert.ToString() };
}
}