5eb14f262a
- Previously we used a lot of template magic to see if we could use LastInsertId. But there's a much simpler check that's worth doing, do this at the table level and then let it fall through.
67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
package bdb
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import "fmt"
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// Table metadata from the database schema.
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type Table struct {
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Name string
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// For dbs with real schemas, like Postgres.
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// Example value: "schema_name"."table_name"
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SchemaName string
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Columns []Column
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PKey *PrimaryKey
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FKeys []ForeignKey
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IsJoinTable bool
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ToOneRelationships []ToOneRelationship
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ToManyRelationships []ToManyRelationship
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}
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// GetTable by name. Panics if not found (for use in templates mostly).
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func GetTable(tables []Table, name string) (tbl Table) {
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for _, t := range tables {
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if t.Name == name {
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return t
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}
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}
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panic(fmt.Sprintf("could not find table name: %s", name))
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}
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// GetColumn by name. Panics if not found (for use in templates mostly).
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func (t Table) GetColumn(name string) (col Column) {
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for _, c := range t.Columns {
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if c.Name == name {
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return c
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}
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}
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panic(fmt.Sprintf("could not find column name: %s", name))
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}
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// CanLastInsertID checks the following:
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// 1. Is there only one primary key?
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// 2. Does the primary key column have a default value?
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// 3. Is the primary key column type one of uintX/intX?
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// If the above is all true, this table can use LastInsertId
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func (t Table) CanLastInsertID() bool {
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if t.PKey == nil || len(t.PKey.Columns) != 1 {
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return false
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}
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col := t.GetColumn(t.PKey.Columns[0])
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if len(col.Default) == 0 {
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return false
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}
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switch col.Type {
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case "int", "int8", "int16", "int32", "int64", "uint", "uint8", "uint16", "uint32", "uint64":
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default:
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return false
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}
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return true
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}
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