91 lines
1.8 KiB
Go
91 lines
1.8 KiB
Go
package psql
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import (
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"bytes"
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"errors"
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"io"
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"github.com/dosco/super-graph/jsn"
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"github.com/dosco/super-graph/qcode"
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)
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func (co *Compiler) compileMutation(qc *qcode.QCode, w *bytes.Buffer, vars Variables) (uint32, error) {
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if len(qc.Selects) == 0 {
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return 0, errors.New("empty query")
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}
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c := &compilerContext{w, qc.Selects, co}
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root := &qc.Selects[0]
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c.w.WriteString(`WITH `)
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c.w.WriteString(root.Table)
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c.w.WriteString(` AS (`)
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if _, err := c.renderInsert(qc, w, vars); err != nil {
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return 0, err
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}
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c.w.WriteString(`) `)
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return c.compileQuery(qc, w)
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}
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func (c *compilerContext) renderInsert(qc *qcode.QCode, w *bytes.Buffer, vars Variables) (uint32, error) {
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root := &qc.Selects[0]
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insert, ok := vars["insert"]
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if !ok {
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return 0, errors.New("Variable 'insert' not defined")
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}
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jt, array, err := jsn.Tree(insert)
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if err != nil {
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return 0, err
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}
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c.w.WriteString(`WITH input AS (SELECT {{insert}}::json AS j) INSERT INTO `)
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c.w.WriteString(root.Table)
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io.WriteString(c.w, " (")
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c.renderInsertColumns(qc, w, jt)
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io.WriteString(c.w, ")")
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c.w.WriteString(` SELECT `)
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c.renderInsertColumns(qc, w, jt)
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c.w.WriteString(` FROM input i, `)
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if array {
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c.w.WriteString(`json_populate_recordset`)
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} else {
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c.w.WriteString(`json_populate_record`)
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}
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c.w.WriteString(`(NULL::`)
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c.w.WriteString(root.Table)
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c.w.WriteString(`, i.j) t RETURNING * `)
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return 0, nil
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}
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func (c *compilerContext) renderInsertColumns(qc *qcode.QCode, w *bytes.Buffer,
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jt map[string]interface{}) (uint32, error) {
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ti, err := c.schema.GetTable(qc.Selects[0].Table)
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if err != nil {
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return 0, err
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}
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i := 0
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for _, cn := range ti.ColumnNames {
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if _, ok := jt[cn]; !ok {
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continue
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}
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if i != 0 {
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io.WriteString(c.w, ", ")
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}
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c.w.WriteString(cn)
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i++
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}
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return 0, nil
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}
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