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222 lines
5.4 KiB
Go
222 lines
5.4 KiB
Go
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package orm
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import (
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"fmt"
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"strconv"
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"strings"
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)
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var quote string = `"`
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// PostgresQueryBuilder is the SQL build
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type PostgresQueryBuilder struct {
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tokens []string
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}
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func processingStr(str []string) string {
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s := strings.Join(str, `","`)
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s = fmt.Sprintf("%s%s%s", quote, s, quote)
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return s
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}
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// Select will join the fields
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func (qb *PostgresQueryBuilder) Select(fields ...string) QueryBuilder {
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var str string
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n := len(fields)
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if fields[0] == "*" {
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str = "*"
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} else {
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for i := 0; i < n; i++ {
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sli := strings.Split(fields[i], ".")
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s := strings.Join(sli, `"."`)
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s = fmt.Sprintf("%s%s%s", quote, s, quote)
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if n == 1 || i == n-1 {
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str += s
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} else {
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str += s + ","
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}
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}
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}
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qb.tokens = append(qb.tokens, "SELECT", str)
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return qb
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}
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// ForUpdate add the FOR UPDATE clause
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func (qb *PostgresQueryBuilder) ForUpdate() QueryBuilder {
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qb.tokens = append(qb.tokens, "FOR UPDATE")
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return qb
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}
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// From join the tables
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func (qb *PostgresQueryBuilder) From(tables ...string) QueryBuilder {
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str := processingStr(tables)
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qb.tokens = append(qb.tokens, "FROM", str)
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return qb
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}
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// InnerJoin INNER JOIN the table
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func (qb *PostgresQueryBuilder) InnerJoin(table string) QueryBuilder {
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str := fmt.Sprintf("%s%s%s", quote, table, quote)
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qb.tokens = append(qb.tokens, "INNER JOIN", str)
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return qb
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}
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// LeftJoin LEFT JOIN the table
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func (qb *PostgresQueryBuilder) LeftJoin(table string) QueryBuilder {
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str := fmt.Sprintf("%s%s%s", quote, table, quote)
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qb.tokens = append(qb.tokens, "LEFT JOIN", str)
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return qb
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}
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// RightJoin RIGHT JOIN the table
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func (qb *PostgresQueryBuilder) RightJoin(table string) QueryBuilder {
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str := fmt.Sprintf("%s%s%s", quote, table, quote)
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qb.tokens = append(qb.tokens, "RIGHT JOIN", str)
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return qb
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}
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// On join with on cond
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func (qb *PostgresQueryBuilder) On(cond string) QueryBuilder {
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var str string
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cond = strings.Replace(cond, " ", "", -1)
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slice := strings.Split(cond, "=")
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for i := 0; i < len(slice); i++ {
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sli := strings.Split(slice[i], ".")
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s := strings.Join(sli, `"."`)
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s = fmt.Sprintf("%s%s%s", quote, s, quote)
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if i == 0 {
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str = s + " =" + " "
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} else {
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str += s
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}
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}
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qb.tokens = append(qb.tokens, "ON", str)
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return qb
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}
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// Where join the Where cond
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func (qb *PostgresQueryBuilder) Where(cond string) QueryBuilder {
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qb.tokens = append(qb.tokens, "WHERE", cond)
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return qb
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}
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// And join the and cond
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func (qb *PostgresQueryBuilder) And(cond string) QueryBuilder {
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qb.tokens = append(qb.tokens, "AND", cond)
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return qb
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}
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// Or join the or cond
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func (qb *PostgresQueryBuilder) Or(cond string) QueryBuilder {
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qb.tokens = append(qb.tokens, "OR", cond)
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return qb
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}
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// In join the IN (vals)
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func (qb *PostgresQueryBuilder) In(vals ...string) QueryBuilder {
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qb.tokens = append(qb.tokens, "IN", "(", strings.Join(vals, CommaSpace), ")")
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return qb
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}
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// OrderBy join the Order by fields
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func (qb *PostgresQueryBuilder) OrderBy(fields ...string) QueryBuilder {
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str := processingStr(fields)
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qb.tokens = append(qb.tokens, "ORDER BY", str)
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return qb
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}
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// Asc join the asc
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func (qb *PostgresQueryBuilder) Asc() QueryBuilder {
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qb.tokens = append(qb.tokens, "ASC")
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return qb
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}
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// Desc join the desc
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func (qb *PostgresQueryBuilder) Desc() QueryBuilder {
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qb.tokens = append(qb.tokens, "DESC")
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return qb
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}
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// Limit join the limit num
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func (qb *PostgresQueryBuilder) Limit(limit int) QueryBuilder {
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qb.tokens = append(qb.tokens, "LIMIT", strconv.Itoa(limit))
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return qb
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}
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// Offset join the offset num
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func (qb *PostgresQueryBuilder) Offset(offset int) QueryBuilder {
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qb.tokens = append(qb.tokens, "OFFSET", strconv.Itoa(offset))
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return qb
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}
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// GroupBy join the Group by fields
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func (qb *PostgresQueryBuilder) GroupBy(fields ...string) QueryBuilder {
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str := processingStr(fields)
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qb.tokens = append(qb.tokens, "GROUP BY", str)
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return qb
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}
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// Having join the Having cond
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func (qb *PostgresQueryBuilder) Having(cond string) QueryBuilder {
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qb.tokens = append(qb.tokens, "HAVING", cond)
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return qb
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}
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// Update join the update table
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func (qb *PostgresQueryBuilder) Update(tables ...string) QueryBuilder {
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str := processingStr(tables)
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qb.tokens = append(qb.tokens, "UPDATE", str)
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return qb
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}
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// Set join the set kv
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func (qb *PostgresQueryBuilder) Set(kv ...string) QueryBuilder {
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qb.tokens = append(qb.tokens, "SET", strings.Join(kv, CommaSpace))
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return qb
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}
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// Delete join the Delete tables
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func (qb *PostgresQueryBuilder) Delete(tables ...string) QueryBuilder {
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qb.tokens = append(qb.tokens, "DELETE")
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if len(tables) != 0 {
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str := processingStr(tables)
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qb.tokens = append(qb.tokens, str)
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}
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return qb
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}
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// InsertInto join the insert SQL
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func (qb *PostgresQueryBuilder) InsertInto(table string, fields ...string) QueryBuilder {
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str := fmt.Sprintf("%s%s%s", quote, table, quote)
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qb.tokens = append(qb.tokens, "INSERT INTO", str)
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if len(fields) != 0 {
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fieldsStr := strings.Join(fields, CommaSpace)
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qb.tokens = append(qb.tokens, "(", fieldsStr, ")")
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}
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return qb
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}
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// Values join the Values(vals)
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func (qb *PostgresQueryBuilder) Values(vals ...string) QueryBuilder {
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valsStr := strings.Join(vals, CommaSpace)
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qb.tokens = append(qb.tokens, "VALUES", "(", valsStr, ")")
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return qb
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}
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// Subquery join the sub as alias
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func (qb *PostgresQueryBuilder) Subquery(sub string, alias string) string {
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return fmt.Sprintf("(%s) AS %s", sub, alias)
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}
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// String join all tokens
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func (qb *PostgresQueryBuilder) String() string {
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s := strings.Join(qb.tokens, " ")
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qb.tokens = qb.tokens[:0]
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return s
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}
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