Updating server dependancies (#6712)

vendor/github.com/go-sql-driver/mysql/statement.go

@@ -11,7 +11,6 @@ package mysql
 import (
 	"database/sql/driver"
 	"fmt"
-	"io"
 	"reflect"
 	"strconv"
 )
@@ -20,6 +19,7 @@ type mysqlStmt struct {
 	mc         *mysqlConn
 	id         uint32
 	paramCount int
+	columns    []mysqlField // cached from the first query
 }
 
 func (stmt *mysqlStmt) Close() error {
@@ -62,30 +62,26 @@ func (stmt *mysqlStmt) Exec(args []driver.Value) (driver.Result, error) {
 
 	// Read Result
 	resLen, err := mc.readResultSetHeaderPacket()
-	if err != nil {
-		return nil, err
-	}
+	if err == nil {
+		if resLen > 0 {
+			// Columns
+			err = mc.readUntilEOF()
+			if err != nil {
+				return nil, err
+			}
 
-	if resLen > 0 {
-		// Columns
-		if err = mc.readUntilEOF(); err != nil {
-			return nil, err
+			// Rows
+			err = mc.readUntilEOF()
 		}
-
-		// Rows
-		if err := mc.readUntilEOF(); err != nil {
-			return nil, err
+		if err == nil {
+			return &mysqlResult{
+				affectedRows: int64(mc.affectedRows),
+				insertId:     int64(mc.insertId),
+			}, nil
 		}
 	}
 
-	if err := mc.discardResults(); err != nil {
-		return nil, err
-	}
-
-	return &mysqlResult{
-		affectedRows: int64(mc.affectedRows),
-		insertId:     int64(mc.insertId),
-	}, nil
+	return nil, err
 }
 
 func (stmt *mysqlStmt) Query(args []driver.Value) (driver.Rows, error) {
@@ -111,15 +107,14 @@ func (stmt *mysqlStmt) Query(args []driver.Value) (driver.Rows, error) {
 
 	if resLen > 0 {
 		rows.mc = mc
-		rows.rs.columns, err = mc.readColumns(resLen)
-	} else {
-		rows.rs.done = true
-
-		switch err := rows.NextResultSet(); err {
-		case nil, io.EOF:
-			return rows, nil
-		default:
-			return nil, err
+		// Columns
+		// If not cached, read them and cache them
+		if stmt.columns == nil {
+			rows.columns, err = mc.readColumns(resLen)
+			stmt.columns = rows.columns
+		} else {
+			rows.columns = stmt.columns
+			err = mc.readUntilEOF()
 		}
 	}