Ejemplo n.º 1
0
func analyzeInsert(ins *sqlparser.Insert, getTable TableGetter) (plan *ExecPlan, err error) {
	plan = &ExecPlan{
		PlanId:    PLAN_PASS_DML,
		FullQuery: GenerateFullQuery(ins),
	}
	tableName := sqlparser.GetTableName(ins.Table)
	if tableName == "" {
		plan.Reason = REASON_TABLE
		return plan, nil
	}
	tableInfo, err := plan.setTableInfo(tableName, getTable)
	if err != nil {
		return nil, err
	}

	if len(tableInfo.Indexes) == 0 || tableInfo.Indexes[0].Name != "PRIMARY" {
		log.Warningf("no primary key for table %s", tableName)
		plan.Reason = REASON_TABLE_NOINDEX
		return plan, nil
	}

	pkColumnNumbers := getInsertPKColumns(ins.Columns, tableInfo)

	if ins.OnDup != nil {
		// Upserts are not safe for statement based replication:
		// http://bugs.mysql.com/bug.php?id=58637
		plan.Reason = REASON_UPSERT
		return plan, nil
	}

	if sel, ok := ins.Rows.(sqlparser.SelectStatement); ok {
		plan.PlanId = PLAN_INSERT_SUBQUERY
		plan.OuterQuery = GenerateInsertOuterQuery(ins)
		plan.Subquery = GenerateSelectLimitQuery(sel)
		if len(ins.Columns) != 0 {
			plan.ColumnNumbers, err = analyzeSelectExprs(sqlparser.SelectExprs(ins.Columns), tableInfo)
			if err != nil {
				return nil, err
			}
		} else {
			// StarExpr node will expand into all columns
			n := sqlparser.SelectExprs{&sqlparser.StarExpr{}}
			plan.ColumnNumbers, err = analyzeSelectExprs(n, tableInfo)
			if err != nil {
				return nil, err
			}
		}
		plan.SubqueryPKColumns = pkColumnNumbers
		return plan, nil
	}

	// If it's not a sqlparser.SelectStatement, it's Values.
	rowList := ins.Rows.(sqlparser.Values)
	pkValues, err := getInsertPKValues(pkColumnNumbers, rowList, tableInfo)
	if err != nil {
		return nil, err
	}
	if pkValues != nil {
		plan.PlanId = PLAN_INSERT_PK
		plan.OuterQuery = plan.FullQuery
		plan.PKValues = pkValues
	}
	return plan, nil
}
Ejemplo n.º 2
0
func analyzeInsert(ins *sqlparser.Insert, getTable TableGetter) (plan *ExecPlan, err error) {
	plan = &ExecPlan{
		PlanID:    PlanPassDML,
		FullQuery: GenerateFullQuery(ins),
	}
	tableName := sqlparser.GetTableName(ins.Table)
	if tableName == "" {
		plan.Reason = ReasonTable
		return plan, nil
	}
	tableInfo, err := plan.setTableInfo(tableName, getTable)
	if err != nil {
		return nil, err
	}

	if len(tableInfo.Indexes) == 0 || tableInfo.Indexes[0].Name != "PRIMARY" {
		log.Warningf("no primary key for table %s", tableName)
		plan.Reason = ReasonTableNoIndex
		return plan, nil
	}

	pkColumnNumbers := getInsertPKColumns(ins.Columns, tableInfo)

	if sel, ok := ins.Rows.(sqlparser.SelectStatement); ok {
		if ins.OnDup != nil {
			// Upserts not allowed for subqueries.
			// http://bugs.mysql.com/bug.php?id=58637
			plan.Reason = ReasonUpsert
			return plan, nil
		}
		plan.PlanID = PlanInsertSubquery
		plan.OuterQuery = GenerateInsertOuterQuery(ins)
		plan.Subquery = GenerateSelectLimitQuery(sel)
		if len(ins.Columns) != 0 {
			plan.ColumnNumbers, err = analyzeSelectExprs(sqlparser.SelectExprs(ins.Columns), tableInfo)
			if err != nil {
				return nil, err
			}
		} else {
			// StarExpr node will expand into all columns
			n := sqlparser.SelectExprs{&sqlparser.StarExpr{}}
			plan.ColumnNumbers, err = analyzeSelectExprs(n, tableInfo)
			if err != nil {
				return nil, err
			}
		}
		plan.SubqueryPKColumns = pkColumnNumbers
		return plan, nil
	}

	// If it's not a sqlparser.SelectStatement, it's Values.
	rowList := ins.Rows.(sqlparser.Values)
	pkValues, err := getInsertPKValues(pkColumnNumbers, rowList, tableInfo)
	if err != nil {
		return nil, err
	}
	if pkValues == nil {
		plan.Reason = ReasonComplexExpr
		return plan, nil
	}
	plan.PKValues = pkValues
	if ins.OnDup == nil {
		plan.PlanID = PlanInsertPK
		plan.OuterQuery = sqlparser.GenerateParsedQuery(ins)
		return plan, nil
	}
	if len(rowList) > 1 {
		// Upsert supported only for single row inserts.
		plan.Reason = ReasonUpsert
		return plan, nil
	}
	plan.SecondaryPKValues, err = analyzeUpdateExpressions(sqlparser.UpdateExprs(ins.OnDup), tableInfo.Indexes[0])
	if err != nil {
		if err == ErrTooComplex {
			plan.Reason = ReasonPKChange
			return plan, nil
		}
		return nil, err
	}
	plan.PlanID = PlanUpsertPK
	newins := *ins
	newins.Ignore = ""
	newins.OnDup = nil
	plan.OuterQuery = sqlparser.GenerateParsedQuery(&newins)
	upd := &sqlparser.Update{
		Comments: ins.Comments,
		Table:    ins.Table,
		Exprs:    sqlparser.UpdateExprs(ins.OnDup),
	}
	plan.UpsertQuery = GenerateUpdateOuterQuery(upd)
	return plan, nil
}
Ejemplo n.º 3
0
// Wireup performs the wire-up tasks.
func (rb *route) Wireup(bldr builder, jt *jointab) error {
	// Resolve values stored in the builder.
	var err error
	switch vals := rb.ERoute.Values.(type) {
	case *sqlparser.ComparisonExpr:
		// A comparison expression is stored only if it was an IN clause.
		// We have to convert it to use a list argutment and resolve values.
		rb.ERoute.Values, err = rb.procureValues(bldr, jt, vals.Right)
		if err != nil {
			return err
		}
		vals.Right = sqlparser.ListArg("::" + engine.ListVarName)
	default:
		rb.ERoute.Values, err = rb.procureValues(bldr, jt, vals)
		if err != nil {
			return err
		}
	}

	// Fix up the AST.
	_ = sqlparser.Walk(func(node sqlparser.SQLNode) (bool, error) {
		switch node := node.(type) {
		case *sqlparser.Select:
			if len(node.SelectExprs) == 0 {
				node.SelectExprs = sqlparser.SelectExprs([]sqlparser.SelectExpr{
					&sqlparser.NonStarExpr{
						Expr: sqlparser.NumVal([]byte{'1'}),
					},
				})
			}
		case *sqlparser.ComparisonExpr:
			if node.Operator == sqlparser.EqualStr {
				if exprIsValue(node.Left, rb) && !exprIsValue(node.Right, rb) {
					node.Left, node.Right = node.Right, node.Left
				}
			}
		}
		return true, nil
	}, &rb.Select)

	// Generate query while simultaneously resolving values.
	varFormatter := func(buf *sqlparser.TrackedBuffer, node sqlparser.SQLNode) {
		switch node := node.(type) {
		case *sqlparser.ColName:
			if !rb.isLocal(node) {
				joinVar := jt.Procure(bldr, node, rb.Order())
				rb.ERoute.JoinVars[joinVar] = struct{}{}
				buf.Myprintf("%a", ":"+joinVar)
				return
			}
		case *sqlparser.TableName:
			node.Name.Format(buf)
			return
		}
		node.Format(buf)
	}
	buf := sqlparser.NewTrackedBuffer(varFormatter)
	varFormatter(buf, &rb.Select)
	rb.ERoute.Query = buf.ParsedQuery().Query
	rb.ERoute.FieldQuery = rb.generateFieldQuery(&rb.Select, jt)
	return nil
}