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