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GeezerVison is showing github.com — sqlparser/parsed_query.go at master · smlxl/sqlparser
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Expand file tree/ Copy pathparsed_query.goMore file actions 169 lines (149 loc) · 4.79 KB / Copy pathparsed_query.goFile metadata and controls169 lines (149 loc) · 4.79 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 /* Copyright 2019 The Vitess Authors. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ package sqlparser import ( "encoding/json" "fmt" "strings" "vitess.io/vitess/go/sqltypes" querypb "vitess.io/vitess/go/vt/proto/query" ) // ParsedQuery represents a parsed query where // bind locations are precomputed for fast substitutions. type ParsedQuery struct { Query string bindLocations []BindLocation truncateUILen int } type BindLocation struct { Offset, Length int } // NewParsedQuery returns a ParsedQuery of the ast. func NewParsedQuery(node SQLNode) *ParsedQuery { buf := NewTrackedBuffer(nil) buf.Myprintf("%v", node) return buf.ParsedQuery() } // GenerateQuery generates a query by substituting the specified // bindVariables. The extras parameter specifies special parameters // that can perform custom encoding. func (pq *ParsedQuery) GenerateQuery(bindVariables map[string]*querypb.BindVariable, extras map[string]Encodable) (string, error) { if len(pq.bindLocations) == 0 { return pq.Query, nil } var buf strings.Builder buf.Grow(len(pq.Query)) if err := pq.Append(&buf, bindVariables, extras); err != nil { return "", err } return buf.String(), nil } // Append appends the generated query to the provided buffer. func (pq *ParsedQuery) Append(buf *strings.Builder, bindVariables map[string]*querypb.BindVariable, extras map[string]Encodable) error { current := 0 for _, loc := range pq.bindLocations { buf.WriteString(pq.Query[current:loc.Offset]) name := pq.Query[loc.Offset : loc.Offset+loc.Length] if encodable, ok := extras[name[1:]]; ok { encodable.EncodeSQL(buf) } else { supplied, _, err := FetchBindVar(name, bindVariables) if err != nil { return err } EncodeValue(buf, supplied) } current = loc.Offset + loc.Length } buf.WriteString(pq.Query[current:]) return nil } func (pq *ParsedQuery) BindLocations() []BindLocation { return pq.bindLocations } // MarshalJSON is a custom JSON marshaler for ParsedQuery. func (pq *ParsedQuery) MarshalJSON() ([]byte, error) { return json.Marshal(pq.Query) } // EncodeValue encodes one bind variable value into the query. func EncodeValue(buf *strings.Builder, value *querypb.BindVariable) { switch value.Type { case querypb.Type_TUPLE: buf.WriteByte('(') for i, bv := range value.Values { if i != 0 { buf.WriteString(", ") } sqltypes.ProtoToValue(bv).EncodeSQLStringBuilder(buf) } buf.WriteByte(')') case querypb.Type_JSON: v, _ := sqltypes.BindVariableToValue(value) buf.Write(v.Raw()) default: v, _ := sqltypes.BindVariableToValue(value) v.EncodeSQLStringBuilder(buf) } } // FetchBindVar resolves the bind variable by fetching it from bindVariables. func FetchBindVar(name string, bindVariables map[string]*querypb.BindVariable) (val *querypb.BindVariable, isList bool, err error) { name = name[1:] if name[0] == ':' { name = name[1:] isList = true } supplied, ok := bindVariables[name] if !ok { return nil, false, fmt.Errorf("missing bind var %s", name) } if isList { if supplied.Type != querypb.Type_TUPLE { return nil, false, fmt.Errorf("unexpected list arg type (%v) for key %s", supplied.Type, name) } if len(supplied.Values) == 0 { return nil, false, fmt.Errorf("empty list supplied for %s", name) } return supplied, true, nil } if supplied.Type == querypb.Type_TUPLE { return nil, false, fmt.Errorf("unexpected arg type (TUPLE) for non-list key %s", name) } return supplied, false, nil } // ParseAndBind is a one step sweep that binds variables to an input query, in order of placeholders. // It is useful when one doesn't have any parser-variables, just bind variables. // Example: // // query, err := ParseAndBind("select * from tbl where name=%a", sqltypes.StringBindVariable("it's me")) func ParseAndBind(in string, binds ...*querypb.BindVariable) (query string, err error) { vars := make([]any, len(binds)) for i, bv := range binds { switch bv.Type { case querypb.Type_TUPLE: vars[i] = fmt.Sprintf("::vars%d", i) default: vars[i] = fmt.Sprintf(":var%d", i) } } parsed := BuildParsedQuery(in, vars...) bindVars := map[string]*querypb.BindVariable{} for i, bv := range binds { switch bv.Type { case querypb.Type_TUPLE: bindVars[fmt.Sprintf("vars%d", i)] = binds[i] default: bindVars[fmt.Sprintf("var%d", i)] = binds[i] } } return parsed.GenerateQuery(bindVars, nil) } |
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