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sqlconn.go
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sqlconn.go
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package sqlx
import (
"database/sql"
"github.com/tal-tech/go-zero/core/breaker"
)
// ErrNotFound is an alias of sql.ErrNoRows
var ErrNotFound = sql.ErrNoRows
type (
// Session stands for raw connections or transaction sessions
Session interface {
Exec(query string, args ...interface{}) (sql.Result, error)
Prepare(query string) (StmtSession, error)
QueryRow(v interface{}, query string, args ...interface{}) error
QueryRowPartial(v interface{}, query string, args ...interface{}) error
QueryRows(v interface{}, query string, args ...interface{}) error
QueryRowsPartial(v interface{}, query string, args ...interface{}) error
}
// SqlConn only stands for raw connections, so Transact method can be called.
SqlConn interface {
Session
Transact(func(session Session) error) error
}
// SqlOption defines the method to customize a sql connection.
SqlOption func(*commonSqlConn)
// StmtSession interface represents a session that can be used to execute statements.
StmtSession interface {
Close() error
Exec(args ...interface{}) (sql.Result, error)
QueryRow(v interface{}, args ...interface{}) error
QueryRowPartial(v interface{}, args ...interface{}) error
QueryRows(v interface{}, args ...interface{}) error
QueryRowsPartial(v interface{}, args ...interface{}) error
}
// thread-safe
// Because CORBA doesn't support PREPARE, so we need to combine the
// query arguments into one string and do underlying query without arguments
commonSqlConn struct {
driverName string
datasource string
beginTx beginnable
brk breaker.Breaker
accept func(error) bool
}
sessionConn interface {
Exec(query string, args ...interface{}) (sql.Result, error)
Query(query string, args ...interface{}) (*sql.Rows, error)
}
statement struct {
stmt *sql.Stmt
}
stmtConn interface {
Exec(args ...interface{}) (sql.Result, error)
Query(args ...interface{}) (*sql.Rows, error)
}
)
// NewSqlConn returns a SqlConn with given driver name and datasource.
func NewSqlConn(driverName, datasource string, opts ...SqlOption) SqlConn {
conn := &commonSqlConn{
driverName: driverName,
datasource: datasource,
beginTx: begin,
brk: breaker.NewBreaker(),
}
for _, opt := range opts {
opt(conn)
}
return conn
}
func (db *commonSqlConn) Exec(q string, args ...interface{}) (result sql.Result, err error) {
err = db.brk.DoWithAcceptable(func() error {
var conn *sql.DB
conn, err = getSqlConn(db.driverName, db.datasource)
if err != nil {
logInstanceError(db.datasource, err)
return err
}
result, err = exec(conn, q, args...)
return err
}, db.acceptable)
return
}
func (db *commonSqlConn) Prepare(query string) (stmt StmtSession, err error) {
err = db.brk.DoWithAcceptable(func() error {
var conn *sql.DB
conn, err = getSqlConn(db.driverName, db.datasource)
if err != nil {
logInstanceError(db.datasource, err)
return err
}
st, err := conn.Prepare(query)
if err != nil {
return err
}
stmt = statement{
stmt: st,
}
return nil
}, db.acceptable)
return
}
func (db *commonSqlConn) QueryRow(v interface{}, q string, args ...interface{}) error {
return db.queryRows(func(rows *sql.Rows) error {
return unmarshalRow(v, rows, true)
}, q, args...)
}
func (db *commonSqlConn) QueryRowPartial(v interface{}, q string, args ...interface{}) error {
return db.queryRows(func(rows *sql.Rows) error {
return unmarshalRow(v, rows, false)
}, q, args...)
}
func (db *commonSqlConn) QueryRows(v interface{}, q string, args ...interface{}) error {
return db.queryRows(func(rows *sql.Rows) error {
return unmarshalRows(v, rows, true)
}, q, args...)
}
func (db *commonSqlConn) QueryRowsPartial(v interface{}, q string, args ...interface{}) error {
return db.queryRows(func(rows *sql.Rows) error {
return unmarshalRows(v, rows, false)
}, q, args...)
}
func (db *commonSqlConn) Transact(fn func(Session) error) error {
return db.brk.DoWithAcceptable(func() error {
return transact(db, db.beginTx, fn)
}, db.acceptable)
}
func (db *commonSqlConn) acceptable(err error) bool {
ok := err == nil || err == sql.ErrNoRows || err == sql.ErrTxDone
if db.accept == nil {
return ok
}
return ok || db.accept(err)
}
func (db *commonSqlConn) queryRows(scanner func(*sql.Rows) error, q string, args ...interface{}) error {
var qerr error
return db.brk.DoWithAcceptable(func() error {
conn, err := getSqlConn(db.driverName, db.datasource)
if err != nil {
logInstanceError(db.datasource, err)
return err
}
return query(conn, func(rows *sql.Rows) error {
qerr = scanner(rows)
return qerr
}, q, args...)
}, func(err error) bool {
return qerr == err || db.acceptable(err)
})
}
func (s statement) Close() error {
return s.stmt.Close()
}
func (s statement) Exec(args ...interface{}) (sql.Result, error) {
return execStmt(s.stmt, args...)
}
func (s statement) QueryRow(v interface{}, args ...interface{}) error {
return queryStmt(s.stmt, func(rows *sql.Rows) error {
return unmarshalRow(v, rows, true)
}, args...)
}
func (s statement) QueryRowPartial(v interface{}, args ...interface{}) error {
return queryStmt(s.stmt, func(rows *sql.Rows) error {
return unmarshalRow(v, rows, false)
}, args...)
}
func (s statement) QueryRows(v interface{}, args ...interface{}) error {
return queryStmt(s.stmt, func(rows *sql.Rows) error {
return unmarshalRows(v, rows, true)
}, args...)
}
func (s statement) QueryRowsPartial(v interface{}, args ...interface{}) error {
return queryStmt(s.stmt, func(rows *sql.Rows) error {
return unmarshalRows(v, rows, false)
}, args...)
}