119 lines
2.1 KiB
Go
119 lines
2.1 KiB
Go
// Modeling of columns
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package sqlbuilder
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import (
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"strings"
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)
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type column interface {
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expression
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Name() string
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TableName() string
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DefaultAlias() projection
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// Internal function for tracking tableName that a column belongs to
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// for the purpose of serialization
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setTableName(table string)
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}
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type NullableColumn bool
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const (
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Nullable NullableColumn = true
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NotNullable NullableColumn = false
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)
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type Collation string
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const (
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UTF8CaseInsensitive Collation = "utf8_unicode_ci"
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UTF8CaseSensitive Collation = "utf8_unicode"
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UTF8Binary Collation = "utf8_bin"
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)
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// Representation of MySQL charsets
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type Charset string
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const (
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UTF8 Charset = "utf8"
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)
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// The base type for real materialized columns.
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type baseColumn struct {
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expressionInterfaceImpl
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name string
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nullable NullableColumn
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tableName string
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}
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func newBaseColumn(name string, nullable NullableColumn, tableName string, parent column) baseColumn {
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bc := baseColumn{
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name: name,
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nullable: nullable,
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tableName: tableName,
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}
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bc.expressionInterfaceImpl.parent = parent
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return bc
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}
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func (c *baseColumn) Name() string {
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return c.name
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}
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func (c *baseColumn) TableName() string {
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return c.tableName
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}
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func (c *baseColumn) setTableName(table string) {
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c.tableName = table
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}
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func (c *baseColumn) DefaultAlias() projection {
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return c.AS(c.tableName + "." + c.name)
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}
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func (c *baseColumn) serializeAsOrderBy(out *queryData) error {
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if out.statementType == set_statement {
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// set statement (UNION, EXCEPT ...) can reference only select projections in order by clause
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out.WriteString(`"`)
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if c.tableName != "" {
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out.WriteString(c.tableName)
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out.WriteString(".")
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}
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out.WriteString(c.name)
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out.WriteString(`"`)
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return nil
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}
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return c.serialize(out)
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}
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func (c baseColumn) serialize(out *queryData) error {
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if c.tableName != "" {
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out.WriteString(c.tableName)
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out.WriteString(".")
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}
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wrapColumnName := strings.Contains(c.name, ".")
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if wrapColumnName {
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out.WriteString(`"`)
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}
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out.WriteString(c.name)
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if wrapColumnName {
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out.WriteString(`"`)
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}
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return nil
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}
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