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mysql.go
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mysql.go
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package mysql
import (
"database/sql"
"fmt"
"strings"
"github.com/cayleygraph/cayley/clog"
"github.com/cayleygraph/cayley/graph"
"github.com/cayleygraph/cayley/graph/log"
csql "github.com/cayleygraph/cayley/graph/sql"
"github.com/cayleygraph/cayley/quad"
"github.com/go-sql-driver/mysql"
)
const Type = "mysql"
var QueryDialect = csql.QueryDialect{
RegexpOp: "REGEXP",
FieldQuote: func(name string) string {
return "`" + name + "`"
},
Placeholder: func(n int) string { return "?" },
}
func init() {
csql.Register(Type, csql.Registration{
Driver: "mysql",
HashType: fmt.Sprintf(`BINARY(%d)`, quad.HashSize),
BytesType: `BLOB`,
HorizonType: `SERIAL`,
TimeType: `DATETIME(6)`,
QueryDialect: QueryDialect,
NoOffsetWithoutLimit: true,
Error: func(err error) error {
return err
},
Estimated: nil,
RunTx: runTxMysql,
})
}
func runTxMysql(tx *sql.Tx, nodes []graphlog.NodeUpdate, quads []graphlog.QuadUpdate, opts graph.IgnoreOpts) error {
// update node ref counts and insert nodes
var (
// prepared statements for each value type
insertValue = make(map[csql.ValueType]*sql.Stmt)
updateValue *sql.Stmt
)
for _, n := range nodes {
if n.RefInc >= 0 {
nodeKey, values, err := csql.NodeValues(csql.NodeHash{n.Hash}, n.Val)
if err != nil {
return err
}
values = append([]interface{}{n.RefInc}, values...)
values = append(values, n.RefInc) // one more time for UPDATE
stmt, ok := insertValue[nodeKey]
if !ok {
var ph = make([]string, len(values)-1) // excluding last increment
for i := range ph {
ph[i] = "?"
}
stmt, err = tx.Prepare(`INSERT INTO nodes(refs, hash, ` +
strings.Join(nodeKey.Columns(), ", ") +
`) VALUES (` + strings.Join(ph, ", ") +
`) ON DUPLICATE KEY UPDATE refs = refs + ?;`)
if err != nil {
return err
}
insertValue[nodeKey] = stmt
}
_, err = stmt.Exec(values...)
err = convInsertError(err)
if err != nil {
clog.Errorf("couldn't exec INSERT statement: %v", err)
return err
}
} else {
panic("unexpected node update")
}
}
for _, s := range insertValue {
s.Close()
}
if s := updateValue; s != nil {
s.Close()
}
insertValue = nil
updateValue = nil
// now we can deal with quads
ignore := ""
if opts.IgnoreDup {
ignore = " IGNORE"
}
var (
insertQuad *sql.Stmt
err error
)
for _, d := range quads {
dirs := make([]interface{}, 0, len(quad.Directions))
for _, h := range d.Quad.Dirs() {
dirs = append(dirs, csql.NodeHash{h}.SQLValue())
}
if !d.Del {
if insertQuad == nil {
insertQuad, err = tx.Prepare(`INSERT` + ignore + ` INTO quads(subject_hash, predicate_hash, object_hash, label_hash, ts) VALUES (?, ?, ?, ?, now());`)
if err != nil {
return err
}
insertValue = make(map[csql.ValueType]*sql.Stmt)
}
_, err := insertQuad.Exec(dirs...)
err = convInsertError(err)
if err != nil {
if _, ok := err.(*graph.DeltaError); !ok {
clog.Errorf("couldn't exec INSERT statement: %v", err)
}
return err
}
} else {
panic("unexpected quad delete")
}
}
return nil
}
func convInsertError(err error) error {
if err == nil {
return nil
}
if e, ok := err.(*mysql.MySQLError); ok {
if e.Number == 1062 {
// TODO: reference to delta
return &graph.DeltaError{Err: graph.ErrQuadExists}
}
}
return err
}