private static ColumnChanges Distinguish(Column oldColumn, Column newColumn)
{
//if (newColumn == null) throw new ArgumentNullException("newColumn");
//if (newColumn.Name.EqualsIgnoreCase(oldColumn.Name)) throw new InvalidOperationException("newColumn.Name.EqualsIgnoreCase(oldColumn.Name) must be false.");
//if (newColumn.Table.Name.EqualsIgnoreCase(oldColumn.Table.Name)) throw new InvalidOperationException("newColumn.Table.Name.EqualsIgnoreCase(oldColumn.Table.Name) must be false.");
ColumnChanges columnChanged = null;
if (!Equals(newColumn, oldColumn))
{
columnChanged = new ColumnChanges(oldColumn, newColumn, ChangeType.Modified);
if (newColumn.IsRequired != oldColumn.IsRequired)
{
columnChanged.IsRequiredChanged = true;
}
if (newColumn.IsPrimaryKey != oldColumn.IsPrimaryKey)
{
columnChanged.IsPrimaryKeyChanged = true;
}
if (!DbTypeHelper.IsCompatible(newColumn.DataType, oldColumn.DataType))
{
columnChanged.IsDbTypeChanged = true;
}
//ForeignRelationChangeType
columnChanged.ForeignRelationChangeType = ChangeType.UnChanged;
if (!newColumn.IsForeignKey && oldColumn.IsForeignKey)
{
columnChanged.ForeignRelationChangeType = ChangeType.Removed;
}
else if (newColumn.IsForeignKey && !oldColumn.IsForeignKey)
{
columnChanged.ForeignRelationChangeType = ChangeType.Added;
}
else if (newColumn.IsForeignKey && oldColumn.IsForeignKey)
{
if (!Equals(newColumn.ForeignConstraint, oldColumn.ForeignConstraint))
{
columnChanged.ForeignRelationChangeType = ChangeType.Modified;
}
}
}
return(columnChanged);
}
/// <summary>
/// 计算出新旧表之间的数据列差别
/// </summary>
/// <param name="oldTable">旧表</param>
/// <param name="newTable">新表</param>
/// <returns>
/// 返回表之间区别，如果没有区别，则返回null
/// </returns>
private static TableChanges Distinguish(Table oldTable, Table newTable)
{
//if (newTable == null) throw new ArgumentNullException("newTable");
//if (oldTable == null) throw new ArgumentNullException("oldTable");
//if (newTable.Name != oldTable.Name) throw new InvalidOperationException("newTable.Name != oldTable.Name must be false.");
var record = new TableChanges(oldTable, newTable, ChangeType.Modified);
//先找到已经删除的列
foreach (var oldColumn in oldTable.Columns)
{
if (newTable.FindColumn(oldColumn.Name) == null)
{
record.ColumnsChanged.Add(new ColumnChanges(oldColumn, null, ChangeType.Removed));
}
}
//记录新增的和更改过的列
foreach (var column in newTable.Columns)
{
Column oldColumn = oldTable.FindColumn(column.Name);
if (oldColumn == null)
{
var columnChanged = new ColumnChanges(null, column, ChangeType.Added);
record.ColumnsChanged.Add(columnChanged);
}
else
{
var columnChanged = Distinguish(oldColumn, column);
//新增的 或者 修改的 列
if (columnChanged != null)
{
record.ColumnsChanged.Add(columnChanged);
}
}
}
//如果被修改了，则返回record；否则返回null
if (record.ColumnsChanged.Count > 0)
{
return(record);
}
return(null);
}
private static ColumnChanges Distinguish(Column oldColumn, Column newColumn)
{
//if (newColumn == null) throw new ArgumentNullException("newColumn");
//if (newColumn.Name.EqualsIgnoreCase(oldColumn.Name)) throw new InvalidOperationException("newColumn.Name.EqualsIgnoreCase(oldColumn.Name) must be false.");
//if (newColumn.Table.Name.EqualsIgnoreCase(oldColumn.Table.Name)) throw new InvalidOperationException("newColumn.Table.Name.EqualsIgnoreCase(oldColumn.Table.Name) must be false.");
ColumnChanges columnChanged = null;
if (!Equals(newColumn, oldColumn))
{
columnChanged = new ColumnChanges(oldColumn, newColumn, ChangeType.Modified);
if (newColumn.IsRequired != oldColumn.IsRequired) { columnChanged.IsRequiredChanged = true; }
if (newColumn.IsPrimaryKey != oldColumn.IsPrimaryKey) { columnChanged.IsPrimaryKeyChanged = true; }
if (newColumn.DataType != oldColumn.DataType) { columnChanged.IsDbTypeChanged = true; }
//ForeignRelationChangeType
columnChanged.ForeignRelationChangeType = ChangeType.UnChanged;
if (!newColumn.IsForeignKey && oldColumn.IsForeignKey)
{
columnChanged.ForeignRelationChangeType = ChangeType.Removed;
}
else if (newColumn.IsForeignKey && !oldColumn.IsForeignKey)
{
columnChanged.ForeignRelationChangeType = ChangeType.Added;
}
else if (newColumn.IsForeignKey && oldColumn.IsForeignKey)
{
if (!Equals(newColumn.ForeignConstraint, oldColumn.ForeignConstraint))
{
columnChanged.ForeignRelationChangeType = ChangeType.Modified;
}
}
}
return columnChanged;
}
/// <summary>
/// 计算出新旧表之间的数据列差别
/// </summary>
/// <param name="oldTable">旧表</param>
/// <param name="newTable">新表</param>
/// <returns>
/// 返回表之间区别，如果没有区别，则返回null
/// </returns>
private static TableChanges Distinguish(Table oldTable, Table newTable)
{
//if (newTable == null) throw new ArgumentNullException("newTable");
//if (oldTable == null) throw new ArgumentNullException("oldTable");
//if (newTable.Name != oldTable.Name) throw new InvalidOperationException("newTable.Name != oldTable.Name must be false.");
var record = new TableChanges(oldTable, newTable, ChangeType.Modified);
//先找到已经删除的列
foreach (var oldColumn in oldTable.Columns)
{
if (newTable.FindColumn(oldColumn.Name) == null)
{
record.ColumnsChanged.Add(new ColumnChanges(oldColumn, null, ChangeType.Removed));
}
}
//记录新增的和更改过的列
foreach (var column in newTable.Columns)
{
Column oldColumn = oldTable.FindColumn(column.Name);
if (oldColumn == null)
{
var columnChanged = new ColumnChanges(null, column, ChangeType.Added);
record.ColumnsChanged.Add(columnChanged);
}
else
{
var columnChanged = Distinguish(oldColumn, column);
//新增的 或者 修改的 列
if (columnChanged != null) { record.ColumnsChanged.Add(columnChanged); }
}
}
//如果被修改了，则返回record；否则返回null
if (record.ColumnsChanged.Count > 0) { return record; }
return null;
}
private void ModifyColumnRequired(ColumnChanges columnChanges)
{
if (columnChanges.NewColumn.IsRequired)
{
if (columnChanges.OldColumn.IsForeignKey)
{
this.AddOperation(new AddNotNullConstraintFK
{
CopyFromColumn = columnChanges.NewColumn
});
}
else
{
this.AddOperation(new AddNotNullConstraint
{
CopyFromColumn = columnChanges.NewColumn
});
}
}
else
{
if (columnChanges.OldColumn.IsForeignKey)
{
this.AddOperation(new RemoveNotNullConstraintFK
{
CopyFromColumn = columnChanges.NewColumn
});
}
else
{
this.AddOperation(new RemoveNotNullConstraint
{
CopyFromColumn = columnChanges.NewColumn
});
}
}
}
private void ModifyColumnForeignConstraint(ColumnChanges columnChanges)
{
var value = columnChanges.ForeignRelationChangeType;
switch (value)
{
case ChangeType.Added:
this.AddOperation(new AddFKConstraint
{
CopyFromConstraint = columnChanges.NewColumn.ForeignConstraint
});
break;
case ChangeType.Removed:
this.AddOperation(new RemoveFKConstraint
{
CopyFromConstraint = columnChanges.OldColumn.ForeignConstraint
});
break;
case ChangeType.Modified:
//throw new NotSupportedException("暂时不支持外键修改。");
this.AddOperation(new RemoveFKConstraint
{
CopyFromConstraint = columnChanges.OldColumn.ForeignConstraint
});
this.AddOperation(new AddFKConstraint
{
CopyFromConstraint = columnChanges.NewColumn.ForeignConstraint
});
break;
default:
break;
}
}
private void ModifyColumn(ColumnChanges columnChanges)
{
//数据类型
if (columnChanges.IsDbTypeChanged)
{
this.AddOperation(new AlterColumnType
{
CopyFromColumn = columnChanges.OldColumn,
NewType = columnChanges.NewColumn.DataType,
IsRequired = columnChanges.OldColumn.IsRequired,
});
}
//是否主键
if (columnChanges.IsPrimaryKeyChanged)
{
var column = columnChanges.NewColumn;
if (column.IsPrimaryKey)
{
this.AddOperation(new AddPKConstraint
{
CopyFromColumn = column,
});
}
else
{
this.AddOperation(new RemovePKConstraint
{
CopyFromColumn = column,
});
}
}
//可空性
if (columnChanges.IsRequiredChanged)
{
this.ModifyColumnRequired(columnChanges);
}
//外键
if (columnChanges.ForeignRelationChangeType != ChangeType.UnChanged)
{
this.ModifyColumnForeignConstraint(columnChanges);
}
}
private void GenerateOpertions(ColumnChanges columnChanges)
{
switch (columnChanges.ChangeType)
{
case ChangeType.Added:
this.AddColumn(columnChanges.NewColumn);
break;
case ChangeType.Removed:
this.RemoveColumn(columnChanges.OldColumn);
break;
case ChangeType.Modified:
this.ModifyColumn(columnChanges);
break;
default:
break;
}
}