Golang model.ColumnInfo类代码示例

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本文整理汇总了Golang中github.com/pingcap/tidb/model.ColumnInfo类的典型用法代码示例。如果您正苦于以下问题：Golang ColumnInfo类的具体用法？Golang ColumnInfo怎么用？Golang ColumnInfo使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。

在下文中一共展示了ColumnInfo类的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的Golang代码示例。

示例1: addColumn

func (d *ddl) addColumn(tblInfo *model.TableInfo, colInfo *model.ColumnInfo, pos *ColumnPosition) (*model.ColumnInfo, int, error) {
	// Check column name duplicate.
	cols := tblInfo.Columns
	position := len(cols)

	// Get column position.
	if pos.Type == ColumnPositionFirst {
		position = 0
	} else if pos.Type == ColumnPositionAfter {
		c := findCol(cols, pos.RelativeColumn)
		if c == nil {
			return nil, 0, errors.Errorf("No such column: %v", pos.RelativeColumn)
		}

		// Insert position is after the mentioned column.
		position = c.Offset + 1
	}

	colInfo.State = model.StateNone
	// To support add column asynchronous, we should mark its offset as the last column.
	// So that we can use origin column offset to get value from row.
	colInfo.Offset = len(cols)

	// Insert col into the right place of the column list.
	newCols := make([]*model.ColumnInfo, 0, len(cols)+1)
	newCols = append(newCols, cols[:position]...)
	newCols = append(newCols, colInfo)
	newCols = append(newCols, cols[position:]...)

	tblInfo.Columns = newCols
	return colInfo, position, nil
}

开发者ID:youprofit，项目名称:tidb，代码行数:32，代码来源:column.go

示例2: createColumnInfo

func (d *ddl) createColumnInfo(tblInfo *model.TableInfo, colInfo *model.ColumnInfo, pos *ast.ColumnPosition) (*model.ColumnInfo, int, error) {
	// Check column name duplicate.
	cols := tblInfo.Columns
	position := len(cols)

	// Get column position.
	if pos.Tp == ast.ColumnPositionFirst {
		position = 0
	} else if pos.Tp == ast.ColumnPositionAfter {
		c := findCol(cols, pos.RelativeColumn.Name.L)
		if c == nil {
			return nil, 0, infoschema.ErrColumnNotExists.GenByArgs(pos.RelativeColumn, tblInfo.Name)
		}

		// Insert position is after the mentioned column.
		position = c.Offset + 1
	}
	colInfo.ID = allocateColumnID(tblInfo)
	colInfo.State = model.StateNone
	// To support add column asynchronous, we should mark its offset as the last column.
	// So that we can use origin column offset to get value from row.
	colInfo.Offset = len(cols)

	// Insert col into the right place of the column list.
	newCols := make([]*model.ColumnInfo, 0, len(cols)+1)
	newCols = append(newCols, cols[:position]...)
	newCols = append(newCols, colInfo)
	newCols = append(newCols, cols[position:]...)

	tblInfo.Columns = newCols
	return colInfo, position, nil
}

开发者ID:pingcap，项目名称:tidb，代码行数:32，代码来源:column.go

注：本文中的github.com/pingcap/tidb/model.ColumnInfo类示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。