mirror of https://github.com/aldy505/bob.git
77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
package bob
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import (
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"bytes"
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"errors"
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"github.com/lann/builder"
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)
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// TODO - The whole file is a todo
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// Meant to find two things: HasTable and HasColumn(s)
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type HasBuilder builder.Builder
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type hasData struct {
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Name string
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Column string
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Schema string
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Placeholder string
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}
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func init() {
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builder.Register(HasBuilder{}, hasData{})
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}
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// HasTable checks for a table's existence by tableName, resolving with a boolean to signal if the table exists.
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func (h HasBuilder) HasTable(table string) HasBuilder {
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return builder.Set(h, "Name", table).(HasBuilder)
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}
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// HasColumn checks if a column exists in the current table, resolves the promise with a boolean, true if the column exists, false otherwise.
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func (h HasBuilder) HasColumn(column string) HasBuilder {
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return builder.Set(h, "Column", column).(HasBuilder)
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}
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// WithSchema specifies the schema to be used when using the schema-building commands.
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func (h HasBuilder) WithSchema(schema string) HasBuilder {
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return builder.Set(h, "Schema", schema).(HasBuilder)
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}
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// PlaceholderFormat changes the default placeholder (?) to desired placeholder.
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func (h HasBuilder) PlaceholderFormat(f string) HasBuilder {
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return builder.Set(h, "Placeholder", f).(HasBuilder)
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}
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// ToSQL returns 3 variables filled out with the correct values based on bindings, etc.
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func (h HasBuilder) ToSQL() (string, []interface{}, error) {
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data := builder.GetStruct(h).(hasData)
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return data.ToSQL()
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}
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// ToSQL returns 3 variables filled out with the correct values based on bindings, etc.
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func (d *hasData) ToSQL() (sqlStr string, args []interface{}, err error) {
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sql := &bytes.Buffer{}
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if d.Name == "" {
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err = errors.New("has statement should have a table name")
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return
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}
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if d.Column != "" && d.Name != "" {
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// search for column
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sql.WriteString("SELECT * FROM information_schema.columns WHERE table_name = ? AND column_name = ?")
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} else if d.Name != "" && d.Column == "" {
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sql.WriteString("SELECT * FROM information_schema.tables WHERE table_name = ?")
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}
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if d.Schema != "" {
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sql.WriteString(" AND table_schema = ?;")
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} else {
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sql.WriteString(" AND table_schema = current_schema();")
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}
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sqlStr = ReplacePlaceholder(sql.String(), d.Placeholder)
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args = createArgs(d.Name, d.Column, d.Schema)
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return
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}
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