// 创建 DELETE 命令
protected override CommandDefine ParseDeleteCommand <T>(DbQueryableInfo_Delete <T> qDelete)
{
var rInfo = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
SqlBuilder builder = new SqlBuilder(this.EscCharLeft, this.EscCharRight);
bool useKey = false;
builder.Append("DELETE t0 FROM ");
builder.AppendMember(rInfo.TableName);
builder.Append(" t0 ");
if (qDelete.Entity != null)
{
object entity = qDelete.Entity;
builder.AppendNewLine();
builder.Append("WHERE ");
foreach (var kv in rInfo.Wrappers)
{
var wrapper = kv.Value as MemberAccessWrapper;
var column = wrapper.Column;
if (column != null && column.IsKey)
{
useKey = true;
var value = wrapper.Get(entity);
var seg = ExpressionVisitorBase.GetSqlValue(value);
builder.AppendMember("t0", wrapper.Member.Name);
builder.Append(" = ");
builder.Append(seg);
builder.Append(" AND ");
}
;
}
builder.Length -= 5;
if (!useKey)
{
throw new XfwException("Delete<T>(T value) require T must have key column.");
}
}
else if (qDelete.SelectInfo != null)
{
TableAliasCache aliases = this.PrepareAlias <T>(qDelete.SelectInfo);
var sc = new CommandDefine_Select.Builder(this.EscCharLeft, this.EscCharRight, aliases);
ExpressionVisitorBase visitor = new JoinExpressionVisitor(this, aliases, qDelete.SelectInfo.Join);
visitor.Write(sc.JoinFragment);
visitor = new WhereExpressionVisitor(this, aliases, qDelete.SelectInfo.Where);
visitor.Write(sc.WhereFragment);
sc.AddNavigation(visitor.Navigations);
builder.Append(sc.Command);
}
return(new CommandDefine(builder.ToString(), null, System.Data.CommandType.Text)); //builder.ToString();
}
// 创建 INSRT 命令
protected override CommandDefine ParseInsertCommand <T>(DbQueryableInfo_Insert <T> qInsert)
{
SqlBuilder builder = new SqlBuilder(this.EscCharLeft, this.EscCharRight);
var rInfo = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
TableAliasCache aliases = new TableAliasCache();
if (qInsert.Entity != null)
{
object entity = qInsert.Entity;
SqlBuilder columns = new SqlBuilder(this.EscCharLeft, this.EscCharRight);
SqlBuilder values = new SqlBuilder(this.EscCharLeft, this.EscCharRight);
foreach (var kv in rInfo.Wrappers)
{
var wrapper = kv.Value as MemberAccessWrapper;
var column = wrapper.Column;
if (column != null && column.NoMapped)
{
continue;
}
if (wrapper.ForeignKey != null)
{
continue;
}
if (wrapper != qInsert.AutoIncrement)
{
columns.AppendMember(wrapper.Member.Name);
columns.Append(',');
var value = wrapper.Get(entity);
string seg = ExpressionVisitorBase.GetSqlValue(value);
values.Append(seg);
values.Append(',');
}
}
columns.Length -= 1;
values.Length -= 1;
if (qInsert.Bulk == null || !qInsert.Bulk.OnlyValue)
{
builder.Append("INSERT INTO ");
builder.AppendMember(rInfo.TableName);
builder.AppendNewLine();
builder.Append('(');
builder.Append(columns);
builder.Append(')');
builder.AppendNewLine();
builder.Append("VALUES");
builder.AppendNewLine();
}
builder.Append('(');
builder.Append(values);
builder.Append(')');
if (qInsert.Bulk != null && !qInsert.Bulk.IsOver)
{
builder.Append(",");
}
if (qInsert.Bulk == null && qInsert.AutoIncrement != null)
{
builder.AppendNewLine();
builder.Append("SELECT CAST(SCOPE_IDENTITY() AS INT)");
}
}
else if (qInsert.SelectInfo != null)
{
builder.Append("INSERT INTO ");
builder.AppendMember(rInfo.TableName);
builder.Append('(');
CommandDefine_Select sc = this.ParseSelectCommand(qInsert.SelectInfo) as CommandDefine_Select;
//for (int i = 0; i < seg.Columns.Count; i++)
int i = 0;
foreach (var kvp in sc.Columns)
{
builder.AppendMember(kvp.Key);
if (i < sc.Columns.Count - 1)
{
builder.Append(',');
builder.AppendNewLine();
}
i++;
}
builder.Append(')');
builder.AppendNewLine();
builder.Append(sc.CommandText);
}
return(new CommandDefine(builder.ToString(), null, System.Data.CommandType.Text)); //builder.ToString();
}
