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150 lines
4.9 KiB
Markdown
150 lines
4.9 KiB
Markdown
# sqlparser [](https://travis-ci.org/xwb1989/sqlparser) [](https://coveralls.io/github/xwb1989/sqlparser) [](https://goreportcard.com/report/github.com/xwb1989/sqlparser) [](https://godoc.org/github.com/xwb1989/sqlparser)
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Go package for parsing MySQL SQL queries.
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## Notice
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The backbone of this repo is extracted from [vitessio/vitess](https://github.com/vitessio/vitess).
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Inside vitessio/vitess there is a very nicely written sql parser. However as it's not a self-contained application, I created this one.
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It applies the same LICENSE as vitessio/vitess.
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## Usage
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```go
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import (
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"github.com/xwb1989/sqlparser"
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)
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```
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Then use:
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```go
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sql := "SELECT * FROM table WHERE a = 'abc'"
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stmt, err := sqlparser.Parse(sql)
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if err != nil {
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// Do something with the err
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}
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// Otherwise do something with stmt
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switch stmt := stmt.(type) {
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case *sqlparser.Select:
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_ = stmt
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case *sqlparser.Insert:
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}
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```
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Alternative to read many queries from a io.Reader:
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```go
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r := strings.NewReader("INSERT INTO table1 VALUES (1, 'a'); INSERT INTO table2 VALUES (3, 4);")
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tokens := sqlparser.NewTokenizer(r)
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for {
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stmt, err := sqlparser.ParseNext(tokens)
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if err == io.EOF {
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break
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}
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// Do something with stmt or err.
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}
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```
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See [parse_test.go](https://github.com/xwb1989/sqlparser/blob/master/parse_test.go) for more examples, or read the [godoc](https://godoc.org/github.com/xwb1989/sqlparser).
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## Porting Instructions
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You only need the below if you plan to try and keep this library up to date with [vitessio/vitess](https://github.com/vitessio/vitess).
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### Keeping up to date
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```bash
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shopt -s nullglob
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VITESS=${GOPATH?}/src/vitess.io/vitess/go/
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XWB1989=${GOPATH?}/src/github.com/xwb1989/sqlparser/
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# Create patches for everything that changed
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LASTIMPORT=1b7879cb91f1dfe1a2dfa06fea96e951e3a7aec5
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for path in ${VITESS?}/{vt/sqlparser,sqltypes,bytes2,hack}; do
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cd ${path}
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git format-patch ${LASTIMPORT?} .
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done;
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# Apply patches to the dependencies
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cd ${XWB1989?}
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git am --directory dependency -p2 ${VITESS?}/{sqltypes,bytes2,hack}/*.patch
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# Apply the main patches to the repo
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cd ${XWB1989?}
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git am -p4 ${VITESS?}/vt/sqlparser/*.patch
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# If you encounter diff failures, manually fix them with
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patch -p4 < .git/rebase-apply/patch
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...
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git add name_of_files
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git am --continue
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# Cleanup
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rm ${VITESS?}/{sqltypes,bytes2,hack}/*.patch ${VITESS?}/*.patch
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# and Finally update the LASTIMPORT in this README.
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```
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### Fresh install
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TODO: Change these instructions to use git to copy the files, that'll make later patching easier.
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```bash
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VITESS=${GOPATH?}/src/vitess.io/vitess/go/
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XWB1989=${GOPATH?}/src/github.com/xwb1989/sqlparser/
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cd ${XWB1989?}
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# Copy all the code
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cp -pr ${VITESS?}/vt/sqlparser/ .
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cp -pr ${VITESS?}/sqltypes dependency
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cp -pr ${VITESS?}/bytes2 dependency
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cp -pr ${VITESS?}/hack dependency
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# Delete some code we haven't ported
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rm dependency/sqltypes/arithmetic.go dependency/sqltypes/arithmetic_test.go dependency/sqltypes/event_token.go dependency/sqltypes/event_token_test.go dependency/sqltypes/proto3.go dependency/sqltypes/proto3_test.go dependency/sqltypes/query_response.go dependency/sqltypes/result.go dependency/sqltypes/result_test.go
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# Some automated fixes
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# Fix imports
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sed -i '.bak' 's_vitess.io/vitess/go/vt/proto/query_github.com/xwb1989/sqlparser/dependency/querypb_g' *.go dependency/sqltypes/*.go
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sed -i '.bak' 's_vitess.io/vitess/go/_github.com/xwb1989/sqlparser/dependency/_g' *.go dependency/sqltypes/*.go
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# Copy the proto, but basically drop everything we don't want
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cp -pr ${VITESS?}/vt/proto/query dependency/querypb
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sed -i '.bak' 's_.*Descriptor.*__g' dependency/querypb/*.go
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sed -i '.bak' 's_.*ProtoMessage.*__g' dependency/querypb/*.go
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sed -i '.bak' 's/proto.CompactTextString(m)/"TODO"/g' dependency/querypb/*.go
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sed -i '.bak' 's/proto.EnumName/EnumName/g' dependency/querypb/*.go
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sed -i '.bak' 's/proto.Equal/reflect.DeepEqual/g' dependency/sqltypes/*.go
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# Remove the error library
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sed -i '.bak' 's/vterrors.Errorf([^,]*, /fmt.Errorf(/g' *.go dependency/sqltypes/*.go
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sed -i '.bak' 's/vterrors.New([^,]*, /errors.New(/g' *.go dependency/sqltypes/*.go
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```
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### Testing
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```bash
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VITESS=${GOPATH?}/src/vitess.io/vitess/go/
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XWB1989=${GOPATH?}/src/github.com/xwb1989/sqlparser/
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cd ${XWB1989?}
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# Test, fix and repeat
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go test ./...
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# Finally make some diffs (for later reference)
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diff -u ${VITESS?}/sqltypes/ ${XWB1989?}/dependency/sqltypes/ > ${XWB1989?}/patches/sqltypes.patch
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diff -u ${VITESS?}/bytes2/ ${XWB1989?}/dependency/bytes2/ > ${XWB1989?}/patches/bytes2.patch
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diff -u ${VITESS?}/vt/proto/query/ ${XWB1989?}/dependency/querypb/ > ${XWB1989?}/patches/querypb.patch
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diff -u ${VITESS?}/vt/sqlparser/ ${XWB1989?}/ > ${XWB1989?}/patches/sqlparser.patch
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``` |