88 lines
2 KiB
Go
88 lines
2 KiB
Go
package postgres
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import (
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"database/sql"
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"github.com/go-jet/jet/generator/internal/metadata"
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)
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// postgresQuerySet is dialect query set for PostgreSQL
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type postgresQuerySet struct{}
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func (p *postgresQuerySet) ListOfTablesQuery() string {
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return `
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SELECT table_name
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FROM information_schema.tables
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where table_schema = $1 and table_type = $2;
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`
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}
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func (p *postgresQuerySet) PrimaryKeysQuery() string {
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return `
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SELECT c.column_name
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FROM information_schema.key_column_usage AS c
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LEFT JOIN information_schema.table_constraints AS t
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ON t.constraint_name = c.constraint_name
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WHERE t.table_schema = $1 AND t.table_name = $2 AND t.constraint_type = 'PRIMARY KEY';
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`
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}
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func (p *postgresQuerySet) ListOfColumnsQuery() string {
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return `
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SELECT column_name, is_nullable, data_type, udt_name, FALSE
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FROM information_schema.columns
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where table_schema = $1 and table_name = $2
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order by ordinal_position;`
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}
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func (p *postgresQuerySet) ListOfEnumsQuery() string {
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return `
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SELECT t.typname,
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e.enumlabel
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FROM pg_catalog.pg_type t
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JOIN pg_catalog.pg_enum e on t.oid = e.enumtypid
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JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace
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WHERE n.nspname = $1
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ORDER BY n.nspname, t.typname, e.enumsortorder;`
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}
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func (p *postgresQuerySet) GetEnumsMetaData(db *sql.DB, schemaName string) ([]metadata.MetaData, error) {
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rows, err := db.Query(p.ListOfEnumsQuery(), schemaName)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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enumsInfosMap := map[string][]string{}
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for rows.Next() {
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var enumName string
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var enumValue string
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err = rows.Scan(&enumName, &enumValue)
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if err != nil {
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return nil, err
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}
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enumValues := enumsInfosMap[enumName]
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enumValues = append(enumValues, enumValue)
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enumsInfosMap[enumName] = enumValues
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}
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err = rows.Err()
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if err != nil {
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return nil, err
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}
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ret := []metadata.MetaData{}
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for enumName, enumValues := range enumsInfosMap {
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ret = append(ret, metadata.EnumMetaData{
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EnumName: enumName,
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Values: enumValues,
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})
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}
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return ret, nil
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}
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