|
| 1 | +package analyzer |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + |
| 6 | + "github.com/sqlc-dev/sqlc/internal/sql/ast" |
| 7 | +) |
| 8 | + |
| 9 | +func (a *analyzer) analyzeInsert(s *ast.InsertStmt) error { |
| 10 | + if s.Relation == nil { |
| 11 | + return fmt.Errorf("insert: missing relation") |
| 12 | + } |
| 13 | + rel, err := a.bindRangeVar(s.Relation) |
| 14 | + if err != nil { |
| 15 | + return err |
| 16 | + } |
| 17 | + a.scope = &scope{rels: []scopeRel{rel}} |
| 18 | + |
| 19 | + targets, err := insertTargets(rel, s.Cols) |
| 20 | + if err != nil { |
| 21 | + return err |
| 22 | + } |
| 23 | + if err := a.bindInsertValues(s.SelectStmt, rel, targets); err != nil { |
| 24 | + return err |
| 25 | + } |
| 26 | + return a.projectReturning(s.ReturningList) |
| 27 | +} |
| 28 | + |
| 29 | +func (a *analyzer) analyzeUpdate(s *ast.UpdateStmt) error { |
| 30 | + sc, err := a.relationScope(s.Relations, s.FromClause) |
| 31 | + if err != nil { |
| 32 | + return err |
| 33 | + } |
| 34 | + a.scope = sc |
| 35 | + target := sc.rels[0] |
| 36 | + |
| 37 | + for _, item := range listItems(s.TargetList) { |
| 38 | + rt, ok := item.(*ast.ResTarget) |
| 39 | + if !ok || rt.Name == nil { |
| 40 | + continue |
| 41 | + } |
| 42 | + col, ok := findColumn(target, *rt.Name) |
| 43 | + if !ok { |
| 44 | + return fmt.Errorf("unknown column %q", *rt.Name) |
| 45 | + } |
| 46 | + if err := a.bindValue(target, &col, rt.Val); err != nil { |
| 47 | + return fmt.Errorf("set %s: %w", *rt.Name, err) |
| 48 | + } |
| 49 | + } |
| 50 | + |
| 51 | + if s.WhereClause != nil { |
| 52 | + if _, err := a.typeExpr(s.WhereClause); err != nil { |
| 53 | + return fmt.Errorf("where: %w", err) |
| 54 | + } |
| 55 | + } |
| 56 | + return a.projectReturning(s.ReturningList) |
| 57 | +} |
| 58 | + |
| 59 | +func (a *analyzer) analyzeDelete(s *ast.DeleteStmt) error { |
| 60 | + sc, err := a.relationScope(s.Relations, s.UsingClause) |
| 61 | + if err != nil { |
| 62 | + return err |
| 63 | + } |
| 64 | + a.scope = sc |
| 65 | + |
| 66 | + if s.WhereClause != nil { |
| 67 | + if _, err := a.typeExpr(s.WhereClause); err != nil { |
| 68 | + return fmt.Errorf("where: %w", err) |
| 69 | + } |
| 70 | + } |
| 71 | + return a.projectReturning(s.ReturningList) |
| 72 | +} |
| 73 | + |
| 74 | +func (a *analyzer) relationScope(relations, extra *ast.List) (*scope, error) { |
| 75 | + sc := &scope{} |
| 76 | + for _, item := range listItems(relations) { |
| 77 | + if err := a.appendFromItem(sc, item); err != nil { |
| 78 | + return nil, err |
| 79 | + } |
| 80 | + } |
| 81 | + for _, item := range listItems(extra) { |
| 82 | + if err := a.appendFromItem(sc, item); err != nil { |
| 83 | + return nil, err |
| 84 | + } |
| 85 | + } |
| 86 | + if len(sc.rels) == 0 { |
| 87 | + return nil, fmt.Errorf("missing target relation") |
| 88 | + } |
| 89 | + return sc, nil |
| 90 | +} |
| 91 | + |
| 92 | +func insertTargets(rel scopeRel, cols *ast.List) ([]scopeCol, error) { |
| 93 | + items := listItems(cols) |
| 94 | + if len(items) == 0 { |
| 95 | + return rel.cols, nil |
| 96 | + } |
| 97 | + out := make([]scopeCol, 0, len(items)) |
| 98 | + for _, item := range items { |
| 99 | + rt, ok := item.(*ast.ResTarget) |
| 100 | + if !ok || rt.Name == nil { |
| 101 | + return nil, fmt.Errorf("insert: unsupported column target %T", item) |
| 102 | + } |
| 103 | + col, ok := findColumn(rel, *rt.Name) |
| 104 | + if !ok { |
| 105 | + return nil, fmt.Errorf("unknown column %q", *rt.Name) |
| 106 | + } |
| 107 | + out = append(out, col) |
| 108 | + } |
| 109 | + return out, nil |
| 110 | +} |
| 111 | + |
| 112 | +func (a *analyzer) bindInsertValues(n ast.Node, rel scopeRel, targets []scopeCol) error { |
| 113 | + if n == nil { |
| 114 | + return nil |
| 115 | + } |
| 116 | + sel, ok := n.(*ast.SelectStmt) |
| 117 | + if !ok { |
| 118 | + return fmt.Errorf("insert: unsupported source %T", n) |
| 119 | + } |
| 120 | + if sel.ValuesLists == nil { |
| 121 | + return fmt.Errorf("insert: INSERT ... SELECT is not supported") |
| 122 | + } |
| 123 | + for _, row := range listItems(sel.ValuesLists) { |
| 124 | + values, ok := row.(*ast.List) |
| 125 | + if !ok { |
| 126 | + continue |
| 127 | + } |
| 128 | + for i, v := range values.Items { |
| 129 | + var target *scopeCol |
| 130 | + if i < len(targets) { |
| 131 | + target = &targets[i] |
| 132 | + } |
| 133 | + if err := a.bindValue(rel, target, v); err != nil { |
| 134 | + return err |
| 135 | + } |
| 136 | + } |
| 137 | + } |
| 138 | + return nil |
| 139 | +} |
| 140 | + |
| 141 | +func (a *analyzer) bindValue(rel scopeRel, target *scopeCol, v ast.Node) error { |
| 142 | + if target != nil { |
| 143 | + switch value := v.(type) { |
| 144 | + case *ast.ParamRef: |
| 145 | + a.inferParam(value.Number, columnType(rel, *target)) |
| 146 | + return nil |
| 147 | + case *ast.A_Const: |
| 148 | + return nil |
| 149 | + } |
| 150 | + } |
| 151 | + _, err := a.typeExpr(v) |
| 152 | + return err |
| 153 | +} |
| 154 | + |
| 155 | +func (a *analyzer) projectReturning(l *ast.List) error { |
| 156 | + for _, item := range listItems(l) { |
| 157 | + rt, ok := item.(*ast.ResTarget) |
| 158 | + if !ok { |
| 159 | + continue |
| 160 | + } |
| 161 | + if err := a.projectTarget(rt); err != nil { |
| 162 | + return err |
| 163 | + } |
| 164 | + } |
| 165 | + return nil |
| 166 | +} |
| 167 | + |
| 168 | +func findColumn(rel scopeRel, name string) (scopeCol, bool) { |
| 169 | + for _, col := range rel.cols { |
| 170 | + if col.name == name { |
| 171 | + return col, true |
| 172 | + } |
| 173 | + } |
| 174 | + return scopeCol{}, false |
| 175 | +} |
| 176 | + |
| 177 | +func columnType(rel scopeRel, col scopeCol) exprType { |
| 178 | + return exprType{ |
| 179 | + typeOID: col.typeOID, |
| 180 | + nullable: !col.notNull, |
| 181 | + sourceClassOID: rel.classOID, |
| 182 | + sourceAttributeOID: col.attOID, |
| 183 | + sourceTableAlias: rel.alias, |
| 184 | + } |
| 185 | +} |
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