Golang ast.ResultField类代码示例

原作者: [db:作者] 来自: [db:来源] 收藏邀请

本文整理汇总了Golang中github.com/pingcap/tidb/ast.ResultField类的典型用法代码示例。如果您正苦于以下问题：Golang ResultField类的具体用法？Golang ResultField怎么用？Golang ResultField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ResultField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: resolveColumnInTableSources

func (nr *nameResolver) resolveColumnInTableSources(cn *ast.ColumnNameExpr, tableSources []*ast.TableSource) (done bool) {
	var matchedResultField *ast.ResultField
	tableNameL := cn.Name.Table.L
	columnNameL := cn.Name.Name.L
	if tableNameL != "" {
		var matchedTable ast.ResultSetNode
		for _, ts := range tableSources {
			if tableNameL == ts.AsName.L {
				// different table name.
				matchedTable = ts
				break
			} else if ts.AsName.L != "" {
				// Table as name shadows table real name.
				continue
			}
			if tn, ok := ts.Source.(*ast.TableName); ok {
				if cn.Name.Schema.L != "" && cn.Name.Schema.L != tn.Schema.L {
					continue
				}
				if tableNameL == tn.Name.L {
					matchedTable = ts
				}
			}
		}
		if matchedTable != nil {
			resultFields := matchedTable.GetResultFields()
			for _, rf := range resultFields {
				if rf.ColumnAsName.L == columnNameL || rf.Column.Name.L == columnNameL {
					// resolve column.
					matchedResultField = rf
					break
				}
			}
		}
	} else {
		for _, ts := range tableSources {
			rfs := ts.GetResultFields()
			for _, rf := range rfs {
				matchAsName := rf.ColumnAsName.L != "" && rf.ColumnAsName.L == columnNameL
				matchColumnName := rf.ColumnAsName.L == "" && rf.Column.Name.L == columnNameL
				if matchAsName || matchColumnName {
					if matchedResultField != nil {
						nr.Err = errors.Errorf("column %s is ambiguous.", cn.Name.Name.O)
						return true
					}
					matchedResultField = rf
				}
			}
		}
	}
	if matchedResultField != nil {
		// Bind column.
		cn.Refer = matchedResultField
		matchedResultField.Referenced = true
		return true
	}
	return false
}

开发者ID:XuHuaiyu，项目名称:tidb，代码行数:58，代码来源:resolver.go

示例2: resolveColumnInResultFields

func (nr *nameResolver) resolveColumnInResultFields(ctx *resolverContext, cn *ast.ColumnNameExpr, rfs []*ast.ResultField) bool {
	var matched *ast.ResultField
	for _, rf := range rfs {
		if cn.Name.Table.L != "" {
			// Check table name
			if rf.TableAsName.L != "" {
				if cn.Name.Table.L != rf.TableAsName.L {
					continue
				}
			} else if cn.Name.Table.L != rf.Table.Name.L {
				continue
			}
		}
		matchAsName := cn.Name.Name.L == rf.ColumnAsName.L
		var matchColumnName bool
		if ctx.inHaving {
			matchColumnName = cn.Name.Name.L == rf.Column.Name.L
		} else {
			matchColumnName = rf.ColumnAsName.L == "" && cn.Name.Name.L == rf.Column.Name.L
		}
		if matchAsName || matchColumnName {
			if rf.Column.Name.L == "" {
				// This is not a real table column, resolve it directly.
				cn.Refer = rf
				rf.Referenced = true
				return true
			}
			if matched == nil {
				matched = rf
			} else {
				sameColumn := matched.TableName == rf.TableName && matched.Column.Name.L == rf.Column.Name.L
				if !sameColumn {
					nr.Err = errors.Errorf("column %s is ambiguous.", cn.Name.Name.O)
					return true
				}
			}
		}
	}
	if matched != nil {
		// If in GroupBy, we clone the ResultField
		if ctx.inGroupBy || ctx.inHaving || ctx.inOrderBy {
			nf := *matched
			expr := matched.Expr
			if cexpr, ok := expr.(*ast.ColumnNameExpr); ok {
				expr = cexpr.Refer.Expr
			}
			nf.Expr = expr
			matched = &nf
		}
		// Bind column.
		cn.Refer = matched
		matched.Referenced = true
		return true
	}
	return false
}

开发者ID:XuHuaiyu，项目名称:tidb，代码行数:56，代码来源:resolver.go

注：本文中的github.com/pingcap/tidb/ast.ResultField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。