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package database |
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import ( |
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"fmt" |
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"strings" |
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"github.com/fraenky8/tables-to-go/pkg/settings" |
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// postgres database driver |
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_ "github.com/lib/pq" |
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) |
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// Postgresql implemenmts the Database interface with help of generalDatabase |
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type Postgresql struct { |
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*GeneralDatabase |
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} |
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// NewPostgresql creates a new Postgresql database |
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func NewPostgresql(s *settings.Settings) *Postgresql { |
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return &Postgresql{ |
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GeneralDatabase: &GeneralDatabase{ |
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Settings: s, |
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driver: dbTypeToDriverMap[settings.DbType(s.DbType)], |
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}, |
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} |
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} |
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// Connect connects to the database by the given data source name (dsn) of the concrete database |
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func (pg *Postgresql) Connect() error { |
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return pg.GeneralDatabase.Connect(pg.DSN(pg.Settings)) |
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} |
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// DSN creates the DSN String to connect to this database |
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func (pg *Postgresql) DSN(settings *settings.Settings) string { |
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return fmt.Sprintf("host=%v port=%v user=%v dbname=%v password=%v sslmode=disable", |
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settings.Host, settings.Port, settings.User, settings.DbName, settings.Pswd) |
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} |
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// GetDriverImportLibrary returns the golang sql driver specific fot the MySQL database |
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func (pg *Postgresql) GetDriverImportLibrary() string { |
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return "pg \"github.com/lib/pq\"" |
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} |
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// GetTables gets all tables for a given schema by name |
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func (pg *Postgresql) GetTables() (tables []*Table, err error) { |
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err = pg.Select(&tables, ` |
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SELECT table_name |
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FROM information_schema.tables |
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WHERE table_type = 'BASE TABLE' |
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AND table_schema = $1 |
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ORDER BY table_name |
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`, pg.Schema) |
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if pg.Verbose { |
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if err != nil { |
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fmt.Println("> Error at GetTables()") |
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fmt.Printf("> schema: %q\r\n", pg.Schema) |
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} |
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} |
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return tables, err |
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} |
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// PrepareGetColumnsOfTableStmt prepares the statement for retrieving the columns of a specific table for a given database |
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func (pg *Postgresql) PrepareGetColumnsOfTableStmt() (err error) { |
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pg.GetColumnsOfTableStmt, err = pg.Preparex(` |
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SELECT |
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ic.ordinal_position, |
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ic.column_name, |
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ic.data_type, |
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ic.column_default, |
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ic.is_nullable, |
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ic.character_maximum_length, |
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ic.numeric_precision, |
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itc.constraint_name, |
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itc.constraint_type |
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FROM information_schema.columns AS ic |
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LEFT JOIN information_schema.key_column_usage AS ikcu ON ic.table_name = ikcu.table_name |
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AND ic.table_schema = ikcu.table_schema |
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AND ic.column_name = ikcu.column_name |
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LEFT JOIN information_schema.table_constraints AS itc ON ic.table_name = itc.table_name |
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AND ic.table_schema = itc.table_schema |
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AND ikcu.constraint_name = itc.constraint_name |
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WHERE ic.table_name = $1 |
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AND ic.table_schema = $2 |
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ORDER BY ic.ordinal_position |
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`) |
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return err |
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} |
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// GetColumnsOfTable executes the statement for retrieving the columns of a specific table in a given schema |
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func (pg *Postgresql) GetColumnsOfTable(table *Table) (err error) { |
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err = pg.GetColumnsOfTableStmt.Select(&table.Columns, table.Name, pg.Schema) |
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if pg.Verbose { |
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if err != nil { |
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fmt.Printf("> Error at GetColumnsOfTable(%v)\r\n", table.Name) |
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fmt.Printf("> schema: %q\r\n", pg.Schema) |
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} |
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} |
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return err |
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} |
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// IsPrimaryKey checks if column belongs to primary key |
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func (pg *Postgresql) IsPrimaryKey(column Column) bool { |
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return strings.Contains(column.ConstraintType.String, "PRIMARY KEY") |
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} |
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// IsAutoIncrement checks if column is a serial column |
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func (pg *Postgresql) IsAutoIncrement(column Column) bool { |
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return strings.Contains(column.DefaultValue.String, "nextval") |
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} |
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// GetStringDatatypes returns the string datatypes for the postgre database |
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func (pg *Postgresql) GetStringDatatypes() []string { |
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return []string{ |
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"character varying", |
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"varchar", |
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"character", |
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"char", |
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} |
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} |
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// IsString returns true if colum is of type string for the postgre database |
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func (pg *Postgresql) IsString(column Column) bool { |
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return pg.IsStringInSlice(column.DataType, pg.GetStringDatatypes()) |
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} |
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// GetTextDatatypes returns the text datatypes for the postgre database |
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func (pg *Postgresql) GetTextDatatypes() []string { |
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return []string{ |
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"text", |
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} |
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} |
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// IsText returns true if colum is of type text for the postgre database |
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func (pg *Postgresql) IsText(column Column) bool { |
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return pg.IsStringInSlice(column.DataType, pg.GetTextDatatypes()) |
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} |
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// GetIntegerDatatypes returns the integer datatypes for the postgre database |
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func (pg *Postgresql) GetIntegerDatatypes() []string { |
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return []string{ |
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"smallint", |
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"integer", |
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"bigint", |
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"smallserial", |
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"serial", |
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"bigserial", |
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} |
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} |
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// IsInteger returns true if colum is of type integer for the postgre database |
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func (pg *Postgresql) IsInteger(column Column) bool { |
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return pg.IsStringInSlice(column.DataType, pg.GetIntegerDatatypes()) |
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} |
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// GetFloatDatatypes returns the float datatypes for the postgre database |
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func (pg *Postgresql) GetFloatDatatypes() []string { |
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return []string{ |
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"numeric", |
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"decimal", |
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"real", |
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"double precision", |
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} |
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} |
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// IsFloat returns true if colum is of type float for the postgre database |
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func (pg *Postgresql) IsFloat(column Column) bool { |
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return pg.IsStringInSlice(column.DataType, pg.GetFloatDatatypes()) |
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} |
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// GetTemporalDatatypes returns the temporal datatypes for the postgre database |
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func (pg *Postgresql) GetTemporalDatatypes() []string { |
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return []string{ |
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"time", |
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"timestamp", |
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"time with time zone", |
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"timestamp with time zone", |
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"time without time zone", |
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"timestamp without time zone", |
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"date", |
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} |
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} |
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// IsTemporal returns true if colum is of type temporal for the postgre database |
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func (pg *Postgresql) IsTemporal(column Column) bool { |
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return pg.IsStringInSlice(column.DataType, pg.GetTemporalDatatypes()) |
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} |
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// GetTemporalDriverDataType returns the time data type specific for the postgre database |
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func (pg *Postgresql) GetTemporalDriverDataType() string { |
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return "pg.NullTime" |
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} |
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