c# - 如何使用 C# 重写 SQLite 表中的值？

Question

例如，我有一个包含两列变量名和值的表。我需要为某些行编辑一个值单元格。我使用代码：

var stateVariable = from c in db.Table<StateVariables>() where c.VariableName == "cursor" select c;
stateVariable.First().Value = cursor;

stateVariable = from c in db.Table<StateVariables>() where c.VariableName == "cursor2" select c;
stateVariable.First().Value = cursor2;

stateVariable = from c in db.Table<StateVariables>() where c.VariableName == "isForward" select c;
stateVariable.First().Value = isForward;

此代码不会更改表中的值。看来我知道原因了。在这里，我正在尝试编辑提取的数据，而不是 db。那么，如何直接在 SQLite 表中编辑值呢？

Answer 1

曾几何时，LINQ 的SubmitChanges工作是：

var recordToUpdate = (from c in db.xxx
                      where c.VariableName == "cursor"
                      select c).Single();
recordToUpdate.Value = cursor;
db.SubmitChanges();

如今，您必须Update改用：

DataSet2TableAdapters.TableTestTableAdapter t = new DataSet2TableAdapters.TableTestTableAdapter();

DataSet2 ds = new DataSet2();
t.Fill(ds.TableTest); 

foreach (DataSet2.TableTestRow row in ds.TableTest.Rows)
{
    row.integer = 12345; // change value of column integer               
}

t.Update(ds2);