Golang sqlparser.NewTrackedBuffer函数代码示例

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/flike/kingshard/sqlparser.NewTrackedBuffer函数的典型用法代码示例。如果您正苦于以下问题：Golang NewTrackedBuffer函数的具体用法？Golang NewTrackedBuffer怎么用？Golang NewTrackedBuffer使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了NewTrackedBuffer函数的8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: generateUpdateSql

func (r *Router) generateUpdateSql(plan *Plan, stmt sqlparser.Statement) error {
	sqls := make(map[string][]string)
	node, ok := stmt.(*sqlparser.Update)
	if ok == false {
		return errors.ErrStmtConvert
	}
	if len(plan.RouteNodeIndexs) == 0 {
		return errors.ErrNoRouteNode
	}
	if len(plan.RouteTableIndexs) == 0 {
		buf := sqlparser.NewTrackedBuffer(nil)
		stmt.Format(buf)
		nodeName := r.Nodes[0]
		sqls[nodeName] = []string{buf.String()}
	} else {
		nodeCount := len(plan.RouteNodeIndexs)
		if 1 < nodeCount {
			golog.Error("Router", "generateUpdateSql", errors.ErrUpdateInMulti.Error(), 0,
				"RouteNodeIndexs", plan.RouteNodeIndexs)
			return errors.ErrUpdateInMulti
		}
		tableCount := len(plan.RouteTableIndexs)
		for i := 0; i < tableCount; i++ {
			buf := sqlparser.NewTrackedBuffer(nil)
			buf.Fprintf("update %v%v",
				node.Comments,
				node.Table,
			)
			fmt.Fprintf(buf, "_%04d", plan.RouteTableIndexs[i])
			buf.Fprintf(" set %v%v%v%v",
				node.Exprs,
				node.Where,
				node.OrderBy,
				node.Limit,
			)
			tableIndex := plan.RouteTableIndexs[i]
			nodeIndex := plan.Rule.TableToNode[tableIndex]
			nodeName := r.Nodes[nodeIndex]
			if _, ok := sqls[nodeName]; ok == false {
				sqls[nodeName] = make([]string, 0, tableCount)
			}
			sqls[nodeName] = append(sqls[nodeName], buf.String())
		}

	}
	plan.RewrittenSqls = sqls
	return nil
}

开发者ID:velsai，项目名称:kingshard，代码行数:48，代码来源:router.go

示例2: generateSelectSql

func (r *Router) generateSelectSql(plan *Plan, stmt sqlparser.Statement) error {
	sqls := make(map[string][]string)
	node, ok := stmt.(*sqlparser.Select)
	if ok == false {
		return ErrStmtConvert
	}
	if len(plan.RouteNodeIndexs) == 0 {
		return ErrNoRouteNode
	}
	if len(plan.RouteTableIndexs) == 0 {
		buf := sqlparser.NewTrackedBuffer(nil)
		stmt.Format(buf)
		nodeName := r.Nodes[0]
		sqls[nodeName] = []string{buf.String()}
	} else {
		tableCount := len(plan.RouteTableIndexs)
		for i := 0; i < tableCount; i++ {
			buf := sqlparser.NewTrackedBuffer(nil)

			buf.Fprintf("select %v%s%v from %v",
				node.Comments,
				node.Distinct,
				node.SelectExprs,
				node.From,
			)
			fmt.Fprintf(buf, "_%04d", plan.RouteTableIndexs[i])
			buf.Fprintf("%v%v%v%v%v%s",
				node.Where,
				node.GroupBy,
				node.Having,
				node.OrderBy,
				node.Limit,
				node.Lock,
			)

			tableIndex := plan.RouteTableIndexs[i]
			nodeIndex := plan.Rule.TableToNode[tableIndex]
			nodeName := r.Nodes[nodeIndex]
			if _, ok := sqls[nodeName]; ok == false {
				sqls[nodeName] = make([]string, 0, tableCount)
			}
			sqls[nodeName] = append(sqls[nodeName], buf.String())
		}

	}
	plan.RewrittenSqls = sqls
	return nil
}

开发者ID:npk，项目名称:kingshard，代码行数:48，代码来源:router.go

示例3: generateSelectSql

func (r *Router) generateSelectSql(plan *Plan, stmt sqlparser.Statement) error {
	sqls := make(map[string][]string)
	node, ok := stmt.(*sqlparser.Select)
	if ok == false {
		return errors.ErrStmtConvert
	}
	if len(plan.RouteNodeIndexs) == 0 {
		return errors.ErrNoRouteNode
	}
	if len(plan.RouteTableIndexs) == 0 {
		buf := sqlparser.NewTrackedBuffer(nil)
		stmt.Format(buf)
		nodeName := r.Nodes[0]
		sqls[nodeName] = []string{buf.String()}
	} else {
		tableCount := len(plan.RouteTableIndexs)
		for i := 0; i < tableCount; i++ {
			tableIndex := plan.RouteTableIndexs[i]
			nodeIndex := plan.Rule.TableToNode[tableIndex]
			nodeName := r.Nodes[nodeIndex]
			selectSql := r.rewriteSelectSql(plan, node, tableIndex)
			if _, ok := sqls[nodeName]; ok == false {
				sqls[nodeName] = make([]string, 0, tableCount)
			}
			sqls[nodeName] = append(sqls[nodeName], selectSql)
		}
	}
	plan.RewrittenSqls = sqls
	return nil
}

开发者ID:flike，项目名称:kingshard，代码行数:30，代码来源:router.go

示例4: generateInsertSql

func (r *Router) generateInsertSql(plan *Plan, stmt sqlparser.Statement) error {
	sqls := make(map[string][]string)
	node, ok := stmt.(*sqlparser.Insert)
	if ok == false {
		return errors.ErrStmtConvert
	}
	if len(plan.RouteNodeIndexs) == 0 {
		return errors.ErrNoRouteNode
	}
	if len(plan.RouteTableIndexs) == 0 {
		buf := sqlparser.NewTrackedBuffer(nil)
		stmt.Format(buf)
		nodeName := r.Nodes[0]
		sqls[nodeName] = []string{buf.String()}
	} else {
		tableCount := len(plan.RouteTableIndexs)
		for i := 0; i < tableCount; i++ {
			buf := sqlparser.NewTrackedBuffer(nil)
			tableIndex := plan.RouteTableIndexs[i]
			nodeIndex := plan.Rule.TableToNode[tableIndex]
			nodeName := r.Nodes[nodeIndex]

			buf.Fprintf("insert %vinto ", node.Comments)
			table := sqlparser.String(node.Table)
			if table[len(table)-1] == '`' {
				fmt.Fprintf(buf, "%s_%04d`", table[:len(table)-1], plan.RouteTableIndexs[i])
			} else {
				fmt.Fprintf(buf, "%s_%04d", table, plan.RouteTableIndexs[i])
			}

			buf.Fprintf("%v %v%v",
				node.Columns,
				plan.Rows[tableIndex],
				node.OnDup)

			if _, ok := sqls[nodeName]; ok == false {
				sqls[nodeName] = make([]string, 0, tableCount)
			}
			sqls[nodeName] = append(sqls[nodeName], buf.String())
		}

	}
	plan.RewrittenSqls = sqls
	return nil
}

开发者ID:snower，项目名称:kingshard，代码行数:45，代码来源:router.go

示例5: generateInsertSql

func (r *Router) generateInsertSql(plan *Plan, stmt sqlparser.Statement) error {
	sqls := make(map[string][]string)
	node, ok := stmt.(*sqlparser.Insert)
	if ok == false {
		return ErrStmtConvert
	}
	if len(plan.RouteNodeIndexs) == 0 {
		return ErrNoRouteNode
	}
	if len(plan.RouteTableIndexs) == 0 {
		buf := sqlparser.NewTrackedBuffer(nil)
		stmt.Format(buf)
		nodeName := r.Nodes[0]
		sqls[nodeName] = []string{buf.String()}
	} else {
		nodeCount := len(plan.RouteNodeIndexs)
		if 1 < nodeCount {
			golog.Error("Router", "generateInsertSql", ErrInsertInMulti.Error(), 0)
			return ErrInsertInMulti
		}
		tableCount := len(plan.RouteTableIndexs)
		for i := 0; i < tableCount; i++ {
			buf := sqlparser.NewTrackedBuffer(nil)
			buf.Fprintf("insert %vinto %v", node.Comments, node.Table)
			fmt.Fprintf(buf, "_%04d", plan.RouteTableIndexs[i])
			buf.Fprintf("%v %v%v",
				node.Columns,
				node.Rows,
				node.OnDup)

			tableIndex := plan.RouteTableIndexs[i]
			nodeIndex := plan.Rule.TableToNode[tableIndex]
			nodeName := r.Nodes[nodeIndex]
			if _, ok := sqls[nodeName]; ok == false {
				sqls[nodeName] = make([]string, 0, tableCount)
			}
			sqls[nodeName] = append(sqls[nodeName], buf.String())
		}

	}
	plan.RewrittenSqls = sqls
	return nil
}

开发者ID:npk，项目名称:kingshard，代码行数:43，代码来源:router.go

示例6: rewriteSelectSql

//rewrite select sql
func (r *Router) rewriteSelectSql(plan *Plan, node *sqlparser.Select, tableIndex int) string {
	buf := sqlparser.NewTrackedBuffer(nil)
	buf.Fprintf("select %v%s",
		node.Comments,
		node.Distinct,
	)

	var prefix string
	//rewrite select expr
	for _, expr := range node.SelectExprs {
		switch v := expr.(type) {
		case *sqlparser.StarExpr:
			//for shardTable.*,need replace table into shardTable_xxxx.
			if string(v.TableName) == plan.Rule.Table {
				fmt.Fprintf(buf, "%s%s_%04d.*",
					prefix,
					plan.Rule.Table,
					tableIndex,
				)
			} else {
				buf.Fprintf("%s%v", prefix, expr)
			}
		case *sqlparser.NonStarExpr:
			//rewrite shardTable.column as a
			//into shardTable_xxxx.column as a
			if colName, ok := v.Expr.(*sqlparser.ColName); ok {
				if string(colName.Qualifier) == plan.Rule.Table {
					fmt.Fprintf(buf, "%s%s_%04d.%s",
						prefix,
						plan.Rule.Table,
						tableIndex,
						string(colName.Name),
					)
				} else {
					buf.Fprintf("%s%v", prefix, colName)
				}
				//if expr has as
				if v.As != nil {
					buf.Fprintf(" as %s", v.As)
				}
			} else {
				buf.Fprintf("%s%v", prefix, expr)
			}
		default:
			buf.Fprintf("%s%v", prefix, expr)
		}
		prefix = ", "
	}
	//insert the group columns in the first of select cloumns
	if len(node.GroupBy) != 0 {
		prefix = ","
		for _, n := range node.GroupBy {
			buf.Fprintf("%s%v", prefix, n)
		}
	}
	buf.Fprintf(" from ")
	switch v := (node.From[0]).(type) {
	case *sqlparser.AliasedTableExpr:
		if len(v.As) != 0 {
			fmt.Fprintf(buf, "%s_%04d as %s",
				sqlparser.String(v.Expr),
				tableIndex,
				string(v.As),
			)
		} else {
			fmt.Fprintf(buf, "%s_%04d",
				sqlparser.String(v.Expr),
				tableIndex,
			)
		}
	case *sqlparser.JoinTableExpr:
		if ate, ok := (v.LeftExpr).(*sqlparser.AliasedTableExpr); ok {
			if len(ate.As) != 0 {
				fmt.Fprintf(buf, "%s_%04d as %s",
					sqlparser.String(ate.Expr),
					tableIndex,
					string(ate.As),
				)
			} else {
				fmt.Fprintf(buf, "%s_%04d",
					sqlparser.String(ate.Expr),
					tableIndex,
				)
			}
		} else {
			fmt.Fprintf(buf, "%s_%04d",
				sqlparser.String(v.LeftExpr),
				tableIndex,
			)
		}
		buf.Fprintf(" %s %v", v.Join, v.RightExpr)
		if v.On != nil {
			buf.Fprintf(" on %v", v.On)
		}
	default:
		fmt.Fprintf(buf, "%s_%04d",
			sqlparser.String(node.From[0]),
			tableIndex,
		)
//.........这里部分代码省略.........

开发者ID:flike，项目名称:kingshard，代码行数:101，代码来源:router.go

示例7: generateSelectSql

func (r *Router) generateSelectSql(plan *Plan, stmt sqlparser.Statement) error {
	sqls := make(map[string][]string)
	node, ok := stmt.(*sqlparser.Select)
	if ok == false {
		return errors.ErrStmtConvert
	}
	if len(plan.RouteNodeIndexs) == 0 {
		return errors.ErrNoRouteNode
	}
	if len(plan.RouteTableIndexs) == 0 {
		buf := sqlparser.NewTrackedBuffer(nil)
		stmt.Format(buf)
		nodeName := r.Nodes[0]
		sqls[nodeName] = []string{buf.String()}
	} else {
		tableCount := len(plan.RouteTableIndexs)
		for i := 0; i < tableCount; i++ {
			buf := sqlparser.NewTrackedBuffer(nil)
			buf.Fprintf("select %v%s%v from ",
				node.Comments,
				node.Distinct,
				node.SelectExprs,
			)
			switch v := (node.From[0]).(type) {
			case *sqlparser.AliasedTableExpr:
				if len(v.As) != 0 {
					fmt.Fprintf(buf, "%s_%04d AS %s",
						sqlparser.String(v.Expr),
						plan.RouteTableIndexs[i],
						string(v.As),
					)
				} else {
					fmt.Fprintf(buf, "%s_%04d",
						sqlparser.String(v.Expr),
						plan.RouteTableIndexs[i],
					)
				}
			case *sqlparser.JoinTableExpr:
				if ate, ok := (v.LeftExpr).(*sqlparser.AliasedTableExpr); ok {
					if len(ate.As) != 0 {
						fmt.Fprintf(buf, "%s_%04d AS %s",
							sqlparser.String(ate.Expr),
							plan.RouteTableIndexs[i],
							string(ate.As),
						)
					} else {
						fmt.Fprintf(buf, "%s_%04d",
							sqlparser.String(ate.Expr),
							plan.RouteTableIndexs[i],
						)
					}
				} else {
					fmt.Fprintf(buf, "%s_%04d",
						sqlparser.String(v.LeftExpr),
						plan.RouteTableIndexs[i],
					)
				}
				buf.Fprintf(" %s %v", v.Join, v.RightExpr)
				if v.On != nil {
					buf.Fprintf(" on %v", v.On)
				}
			default:
				fmt.Fprintf(buf, "%s_%04d",
					sqlparser.String(node.From[0]),
					plan.RouteTableIndexs[i],
				)
			}
			buf.Fprintf("%v%v%v%v%s",
				node.Where,
				node.GroupBy,
				node.Having,
				node.OrderBy,
				node.Lock,
			)

			tableIndex := plan.RouteTableIndexs[i]
			nodeIndex := plan.Rule.TableToNode[tableIndex]
			nodeName := r.Nodes[nodeIndex]
			if _, ok := sqls[nodeName]; ok == false {
				sqls[nodeName] = make([]string, 0, tableCount)
			}
			sqls[nodeName] = append(sqls[nodeName], buf.String())
		}

	}
	plan.RewrittenSqls = sqls
	return nil
}

开发者ID:zhaoweikid，项目名称:kingshard，代码行数:88，代码来源:router.go

示例8: rewriteSelectSql

//rewrite select sql
func (r *Router) rewriteSelectSql(plan *Plan, node *sqlparser.Select, tableIndex int) string {
	buf := sqlparser.NewTrackedBuffer(nil)
	buf.Fprintf("select %v%s%v",
		node.Comments,
		node.Distinct,
		node.SelectExprs,
	)
	//insert the group columns in the first of select cloumns
	if len(node.GroupBy) != 0 {
		prefix := ","
		for _, n := range node.GroupBy {
			buf.Fprintf("%s%v", prefix, n)
		}
	}
	buf.Fprintf(" from ")

	switch v := (node.From[0]).(type) {
	case *sqlparser.AliasedTableExpr:
		if len(v.As) != 0 {
			fmt.Fprintf(buf, "%s_%04d AS %s",
				sqlparser.String(v.Expr),
				tableIndex,
				string(v.As),
			)
		} else {
			fmt.Fprintf(buf, "%s_%04d",
				sqlparser.String(v.Expr),
				tableIndex,
			)
		}
	case *sqlparser.JoinTableExpr:
		if ate, ok := (v.LeftExpr).(*sqlparser.AliasedTableExpr); ok {
			if len(ate.As) != 0 {
				fmt.Fprintf(buf, "%s_%04d AS %s",
					sqlparser.String(ate.Expr),
					tableIndex,
					string(ate.As),
				)
			} else {
				fmt.Fprintf(buf, "%s_%04d",
					sqlparser.String(ate.Expr),
					tableIndex,
				)
			}
		} else {
			fmt.Fprintf(buf, "%s_%04d",
				sqlparser.String(v.LeftExpr),
				tableIndex,
			)
		}
		buf.Fprintf(" %s %v", v.Join, v.RightExpr)
		if v.On != nil {
			buf.Fprintf(" on %v", v.On)
		}
	default:
		fmt.Fprintf(buf, "%s_%04d",
			sqlparser.String(node.From[0]),
			tableIndex,
		)
	}
	buf.Fprintf("%v%v%v%v%s",
		node.Where,
		node.GroupBy,
		node.Having,
		node.OrderBy,
		node.Lock,
	)
	return buf.String()
}

开发者ID:xww，项目名称:kingshard，代码行数:70，代码来源:router.go

注：本文中的github.com/flike/kingshard/sqlparser.NewTrackedBuffer函数示例整理自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。