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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,186 @@ | ||
| // Copyright 2023 zGraph Authors. All rights reserved. | ||
| // | ||
| // 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 zgraph | ||
|
|
||
| import ( | ||
| "context" | ||
| "database/sql" | ||
| "database/sql/driver" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
|
|
||
| "github.com/vescale/zgraph/session" | ||
| ) | ||
|
|
||
| const driverName = "zgraph" | ||
|
|
||
| func init() { | ||
| sql.Register(driverName, &Driver{}) | ||
| } | ||
|
|
||
| var ( | ||
| _ driver.Driver = &Driver{} | ||
| _ driver.DriverContext = &Driver{} | ||
| _ driver.Connector = &connector{} | ||
| _ io.Closer = &connector{} | ||
| _ driver.Conn = &conn{} | ||
| _ driver.Stmt = &stmt{} | ||
| _ driver.StmtExecContext = &stmt{} | ||
| _ driver.StmtQueryContext = &stmt{} | ||
| _ driver.Rows = &rows{} | ||
| ) | ||
|
|
||
| type Driver struct{} | ||
|
|
||
| func (d *Driver) Open(_ string) (driver.Conn, error) { | ||
| return nil, errors.New("Driver.Open should not be called as Driver.OpenConnector is implemented") | ||
| } | ||
|
|
||
| func (d *Driver) OpenConnector(dsn string) (driver.Connector, error) { | ||
| db, err := Open(dsn, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &connector{db: db}, nil | ||
| } | ||
|
|
||
| type connector struct { | ||
| db *DB | ||
| } | ||
|
|
||
| func (c *connector) Connect(_ context.Context) (driver.Conn, error) { | ||
| return &conn{session: c.db.NewSession()}, nil | ||
| } | ||
|
|
||
| func (c *connector) Driver() driver.Driver { | ||
| return &Driver{} | ||
| } | ||
|
|
||
| func (c *connector) Close() error { | ||
| return c.db.Close() | ||
| } | ||
|
|
||
| type conn struct { | ||
| session *session.Session | ||
| } | ||
|
|
||
| func (c *conn) Ping(_ context.Context) error { | ||
| return nil | ||
| } | ||
|
|
||
| func (c *conn) Prepare(query string) (driver.Stmt, error) { | ||
| return c.PrepareContext(context.Background(), query) | ||
| } | ||
|
|
||
| func (c *conn) PrepareContext(_ context.Context, query string) (driver.Stmt, error) { | ||
| return &stmt{session: c.session, query: query}, nil | ||
| } | ||
|
|
||
| func (c *conn) Close() error { | ||
| c.session.Close() | ||
| return nil | ||
| } | ||
|
|
||
| func (c *conn) Begin() (driver.Tx, error) { | ||
| return c.BeginTx(context.Background(), driver.TxOptions{}) | ||
| } | ||
|
|
||
| func (c *conn) BeginTx(_ context.Context, _ driver.TxOptions) (driver.Tx, error) { | ||
| return nil, errors.New("transactions are not supported") | ||
| } | ||
|
|
||
| type stmt struct { | ||
| session *session.Session | ||
| query string | ||
| } | ||
|
|
||
| func (s *stmt) Close() error { | ||
| return nil | ||
| } | ||
|
|
||
| func (s *stmt) NumInput() int { | ||
| return -1 | ||
| } | ||
|
|
||
| func (s *stmt) Exec(args []driver.Value) (driver.Result, error) { | ||
| if len(args) > 0 { | ||
| return nil, fmt.Errorf("placeholder arguments not supported") | ||
| } | ||
| return s.ExecContext(context.Background(), nil) | ||
| } | ||
|
|
||
| func (s *stmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) { | ||
| if len(args) > 0 { | ||
| return nil, fmt.Errorf("placeholder arguments not supported") | ||
| } | ||
| rs, err := s.session.Execute(ctx, s.query) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if err := rs.Next(ctx); err != nil { | ||
| return nil, err | ||
| } | ||
| return driver.ResultNoRows, nil | ||
| } | ||
|
|
||
| func (s *stmt) Query(args []driver.Value) (driver.Rows, error) { | ||
| if len(args) > 0 { | ||
| return nil, fmt.Errorf("placeholder arguments not supported") | ||
| } | ||
| return s.QueryContext(context.Background(), nil) | ||
| } | ||
|
|
||
| func (s *stmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) { | ||
| if len(args) > 0 { | ||
| return nil, fmt.Errorf("placeholder arguments not supported") | ||
| } | ||
| rs, err := s.session.Execute(ctx, s.query) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &rows{ctx: ctx, rs: rs}, nil | ||
| } | ||
|
|
||
| type rows struct { | ||
| ctx context.Context | ||
| rs session.ResultSet | ||
| } | ||
|
|
||
| func (r *rows) Columns() []string { | ||
| cols := make([]string, 0, len(r.rs.Fields())) | ||
| for _, f := range r.rs.Fields() { | ||
| cols = append(cols, f.Name) | ||
| } | ||
| return cols | ||
| } | ||
|
|
||
| func (r *rows) Close() error { | ||
| return r.rs.Close() | ||
| } | ||
|
|
||
| func (r *rows) Next(dest []driver.Value) error { | ||
| if err := r.rs.Next(r.ctx); err != nil { | ||
| return err | ||
| } | ||
| if !r.rs.Valid() { | ||
| return io.EOF | ||
| } | ||
| var destPtrs []any | ||
| for i := range dest { | ||
| destPtrs = append(destPtrs, &dest[i]) | ||
| } | ||
| return r.rs.Scan(destPtrs...) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| // Copyright 2023 zGraph Authors. All rights reserved. | ||
| // | ||
| // 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 zgraph_test | ||
|
|
||
| import ( | ||
| "context" | ||
| "database/sql" | ||
| "testing" | ||
|
|
||
| "github.com/samber/lo" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestDriver(t *testing.T) { | ||
| db, err := sql.Open("zgraph", t.TempDir()) | ||
| require.NoError(t, err) | ||
| defer db.Close() | ||
|
|
||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| defer cancel() | ||
|
|
||
| conn := lo.Must1(db.Conn(ctx)) | ||
| _ = lo.Must1(conn.ExecContext(ctx, "CREATE GRAPH g")) | ||
| _ = lo.Must1(conn.ExecContext(ctx, "USE g")) | ||
| _ = lo.Must1(conn.ExecContext(ctx, "INSERT VERTEX x PROPERTIES (x.a = 123)")) | ||
| rows := lo.Must1(conn.QueryContext(ctx, "SELECT x.a FROM MATCH (x)")) | ||
|
|
||
| var a int | ||
| require.True(t, rows.Next()) | ||
| require.NoError(t, rows.Scan(&a)) | ||
| require.Equal(t, 123, a) | ||
| require.False(t, rows.Next()) | ||
| require.NoError(t, rows.Err()) | ||
| } |
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