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Optimise buildWhere in the MySQL Adapter.

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This commit is contained in:
Azareal 2020-01-01 18:53:48 +10:00
parent 08864edd6c
commit 53212f3022
1 changed files with 33 additions and 19 deletions
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52
query_gen/mysql.go
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@ -506,27 +506,37 @@ func (a *MysqlAdapter) Purge(name, table string) (string, error) {
return q, nil
}
func (a *MysqlAdapter) buildWhere(where string) (q string, err error) {
func (a *MysqlAdapter) buildWhere(where string, sb *strings.Builder) error {
if len(where) == 0 {
return "", nil
return nil
}
q = " WHERE"
for _, loc := range processWhere(where) {
spl := processWhere(where)
sb.Grow(len(spl) * 8)
for i, loc := range spl {
if i != 0 {
sb.WriteString(" AND ")
} else {
sb.WriteString(" WHERE ")
}
for _, token := range loc.Expr {
switch token.Type {
case TokenFunc, TokenOp, TokenNumber, TokenSub, TokenOr, TokenNot, TokenLike:
q += " " + token.Contents
sb.WriteString(token.Contents)
sb.WriteRune(' ')
case TokenColumn:
q += " `" + token.Contents + "`"
sb.WriteRune('`')
sb.WriteString(token.Contents)
sb.WriteRune('`')
case TokenString:
q += " '" + token.Contents + "'"
sb.WriteRune('\'')
sb.WriteString(token.Contents)
sb.WriteRune('\'')
default:
return q, errors.New("This token doesn't exist o_o")
return errors.New("This token doesn't exist o_o")
}
}
q += " AND"
}
return q[0 : len(q)-4], nil
return nil
}
// The new version of buildWhere() currently only used in ComplexSelect for complex OO builder queries
@ -591,11 +601,12 @@ func (a *MysqlAdapter) SimpleSelect(name, table, columns, where, orderby, limit
}
q = q[0 : len(q)-1]
whereStr, err := a.buildWhere(where)
sb := &strings.Builder{}
err := a.buildWhere(where, sb)
if err != nil {
return q, err
return "", err
}
q += " FROM `" + table + "`" + whereStr + a.buildOrderby(orderby) + a.buildLimit(limit)
q += " FROM `" + table + "`" + sb.String() + a.buildOrderby(orderby) + a.buildLimit(limit)
q = strings.TrimSpace(q)
a.pushStatement(name, "select", q)
@ -732,7 +743,8 @@ func (a *MysqlAdapter) SimpleInnerJoin(name string, table1 string, table2 string
func (a *MysqlAdapter) SimpleUpdateSelect(up *updatePrebuilder) (string, error) {
sel := up.whereSubQuery
whereStr, err := a.buildWhere(sel.where)
sb := &strings.Builder{}
err := a.buildWhere(sel.where, sb)
if err != nil {
return "", err
}
@ -754,19 +766,20 @@ func (a *MysqlAdapter) SimpleUpdateSelect(up *updatePrebuilder) (string, error)
}
setter = setter[0 : len(setter)-1]
q := "UPDATE `" + up.table + "` SET " + setter + " WHERE (SELECT" + a.buildJoinColumns(sel.columns) + " FROM `" + sel.table + "`" + whereStr + a.buildOrderby(sel.orderby) + a.buildLimit(sel.limit) + ")"
q := "UPDATE `" + up.table + "` SET " + setter + " WHERE (SELECT" + a.buildJoinColumns(sel.columns) + " FROM `" + sel.table + "`" + sb.String() + a.buildOrderby(sel.orderby) + a.buildLimit(sel.limit) + ")"
q = strings.TrimSpace(q)
a.pushStatement(up.name, "update", q)
return q, nil
}
func (a *MysqlAdapter) SimpleInsertSelect(name string, ins DBInsert, sel DBSelect) (string, error) {
whereStr, err := a.buildWhere(sel.Where)
sb := &strings.Builder{}
err := a.buildWhere(sel.Where, sb)
if err != nil {
return "", err
}
q := "INSERT INTO `" + ins.Table + "`(" + a.buildColumns(ins.Columns) + ") SELECT" + a.buildJoinColumns(sel.Columns) + " FROM `" + sel.Table + "`" + whereStr + a.buildOrderby(sel.Orderby) + a.buildLimit(sel.Limit)
q := "INSERT INTO `" + ins.Table + "`(" + a.buildColumns(ins.Columns) + ") SELECT" + a.buildJoinColumns(sel.Columns) + " FROM `" + sel.Table + "`" + sb.String() + a.buildOrderby(sel.Orderby) + a.buildLimit(sel.Limit)
q = strings.TrimSpace(q)
a.pushStatement(name, "insert", q)
return q, nil
@ -876,12 +889,13 @@ func (a *MysqlAdapter) SimpleCount(name, table, where, limit string) (q string,
if table == "" {
return "", errors.New("You need a name for this table")
}
whereStr, err := a.buildWhere(where)
sb := &strings.Builder{}
err = a.buildWhere(where, sb)
if err != nil {
return "", err
}
q = "SELECT COUNT(*) FROM `" + table + "`" + whereStr + a.buildLimit(limit)
q = "SELECT COUNT(*) FROM `" + table + "`" + sb.String() + a.buildLimit(limit)
q = strings.TrimSpace(q)
a.pushStatement(name, "select", q)
return q, nil