137 lines
2.8 KiB
Go
137 lines
2.8 KiB
Go
package sqlbuilder
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import (
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"bytes"
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"errors"
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"strconv"
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)
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type clause interface {
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serialize(out *queryData) error
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}
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type queryData struct {
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buff bytes.Buffer
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args []interface{}
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statementType int
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clauseType int
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}
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const (
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select_statement = iota
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insert_statement
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update_statement
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delete_statement
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set_statement
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)
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const (
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projection_clause = iota
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where_clause
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order_by_clause
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group_by_clause
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having_clause
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)
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func (q *queryData) WriteProjection(projections []projection) error {
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q.clauseType = projection_clause
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return serializeProjectionList(projections, q)
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}
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func (q *queryData) WriteWhere(where expression) error {
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q.clauseType = where_clause
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q.WriteString(" WHERE ")
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return where.serialize(q)
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}
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func (q *queryData) WriteGroupBy(groupBy []groupByClause) error {
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q.clauseType = group_by_clause
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q.WriteString(" GROUP BY ")
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return serializeGroupByClauseList(groupBy, q)
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}
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func (q *queryData) WriteOrderBy(orderBy []orderByClause) error {
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q.clauseType = order_by_clause
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q.WriteString(" ORDER BY ")
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return serializeOrderByClauseList(orderBy, q)
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}
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func (q *queryData) WriteHaving(having expression) error {
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q.clauseType = having_clause
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q.WriteString(" HAVING ")
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return having.serialize(q)
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}
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func (q *queryData) Write(data []byte) {
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q.buff.Write(data)
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}
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func (q *queryData) WriteString(str string) {
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q.buff.WriteString(str)
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}
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func (q *queryData) WriteByte(b byte) {
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q.buff.WriteByte(b)
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}
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func (q *queryData) InsertArgument(arg interface{}) {
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q.args = append(q.args, arg)
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argPlaceholder := "$" + strconv.Itoa(len(q.args))
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q.buff.WriteString(argPlaceholder)
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}
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func (q *queryData) Reset() {
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q.buff.Reset()
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q.args = []interface{}{}
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}
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func argToString(value interface{}) (string, error) {
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switch bindVal := value.(type) {
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case bool:
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if bindVal {
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return "TRUE", nil
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} else {
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return "FALSE", nil
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}
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case int8:
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return strconv.FormatInt(int64(bindVal), 10), nil
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case int:
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return strconv.FormatInt(int64(bindVal), 10), nil
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case int16:
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return strconv.FormatInt(int64(bindVal), 10), nil
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case int32:
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return strconv.FormatInt(int64(bindVal), 10), nil
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case int64:
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return strconv.FormatInt(int64(bindVal), 10), nil
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case uint8:
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return strconv.FormatUint(uint64(bindVal), 10), nil
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case uint:
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return strconv.FormatUint(uint64(bindVal), 10), nil
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case uint16:
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return strconv.FormatUint(uint64(bindVal), 10), nil
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case uint32:
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return strconv.FormatUint(uint64(bindVal), 10), nil
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case uint64:
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return strconv.FormatUint(uint64(bindVal), 10), nil
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case float32:
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return strconv.FormatFloat(float64(bindVal), 'f', -1, 64), nil
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case float64:
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return strconv.FormatFloat(float64(bindVal), 'f', -1, 64), nil
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case string:
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return bindVal, nil
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case []byte:
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return string(bindVal), nil
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//TODO: implement
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//case time.Time:
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// return bindVal.String())
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default:
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return "", errors.New("Unsupported literal type. ")
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}
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}
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