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// +build go1.8
package mssql
import (
"context"
"database/sql"
"database/sql/driver"
"errors"
"strings"
)
var _ driver.Pinger = &Conn{}
// Ping is used to check if the remote server is available and satisfies the Pinger interface.
func (c *Conn) Ping(ctx context.Context) error {
if !c.connectionGood {
return driver.ErrBadConn
}
stmt := &Stmt{c, `select 1;`, 0, nil}
_, err := stmt.ExecContext(ctx, nil)
return err
}
var _ driver.ConnBeginTx = &Conn{}
// BeginTx satisfies ConnBeginTx.
func (c *Conn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
if !c.connectionGood {
return nil, driver.ErrBadConn
}
if opts.ReadOnly {
return nil, errors.New("Read-only transactions are not supported")
}
var tdsIsolation isoLevel
switch sql.IsolationLevel(opts.Isolation) {
case sql.LevelDefault:
tdsIsolation = isolationUseCurrent
case sql.LevelReadUncommitted:
tdsIsolation = isolationReadUncommited
case sql.LevelReadCommitted:
tdsIsolation = isolationReadCommited
case sql.LevelWriteCommitted:
return nil, errors.New("LevelWriteCommitted isolation level is not supported")
case sql.LevelRepeatableRead:
tdsIsolation = isolationRepeatableRead
case sql.LevelSnapshot:
tdsIsolation = isolationSnapshot
case sql.LevelSerializable:
tdsIsolation = isolationSerializable
case sql.LevelLinearizable:
return nil, errors.New("LevelLinearizable isolation level is not supported")
default:
return nil, errors.New("Isolation level is not supported or unknown")
}
return c.begin(ctx, tdsIsolation)
}
func (c *Conn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error) {
if !c.connectionGood {
return nil, driver.ErrBadConn
}
if len(query) > 10 && strings.EqualFold(query[:10], "INSERTBULK") {
return c.prepareCopyIn(query)
}
return c.prepareContext(ctx, query)
}
func (s *Stmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
if !s.c.connectionGood {
return nil, driver.ErrBadConn
}
list := make([]namedValue, len(args))
for i, nv := range args {
list[i] = namedValue(nv)
}
return s.queryContext(ctx, list)
}
func (s *Stmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
if !s.c.connectionGood {
return nil, driver.ErrBadConn
}
list := make([]namedValue, len(args))
for i, nv := range args {
list[i] = namedValue(nv)
}
return s.exec(ctx, list)
}
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