87 lines
1.8 KiB
Go
87 lines
1.8 KiB
Go
package ddl
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import "database/sql"
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// DataType is a generic data type of a db type
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type DataType string
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const (
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StringType DataType = "String"
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IntType DataType = "Integer"
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DoubleType DataType = "Double"
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DateType DataType = "Date"
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UnknownType DataType = "Unknown"
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)
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// Table represents a logical table on the database
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type Table struct {
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// Name of the table
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Name string
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// Schema or database the table belongs to
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Schema string
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// List of columns the table has
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Columns []*Column
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}
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// Column of a table.
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// Every database system has a own column struct that embeds
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// this type and extends it with database specific informations
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type Column struct {
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// Unique column name within a table
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Name string
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// Generic data type definition
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Type DataType
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// Internal name of the data type (with lenght)
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InternalType string
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// Weather this column is a primary key of the table
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PrimaryKey bool
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// Weather this column references another table
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ForeignKey bool
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// Table to which this column has a reference to
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ForeignKeyColumn ForeignColumn
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// Weather this column can be null
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CanBeNull bool
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// A default value of the column
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DefaultValue sql.NullString
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// Comment of this column
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Comment string
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// Extras
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Extras Columner
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}
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// Columner returns additonal informations to a column that are specific for a SQL system
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type Columner interface {
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// GetExtraInfos returns a string with additional properties that is passed
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// to the struct tag "Db" when using the struct generator
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GetExtraInfos() string
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// GetSpecificInfos returns the underlaying
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GetSpecificInfos() any
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}
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// ForeignColumn contains information to which the column points to with an foreign key
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type ForeignColumn struct {
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// Name of the referenced table
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Name string
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// Schema or database the table belongs to
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Schema string
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// Name of the column that is referenced
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Column string
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}
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