pgxapi

package
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 Go to latest Published: Jun 30, 2019 License: BSD-2-Clause Imports: 19 Imported by: 1

Documentation

Overview

Package sqlapi contains a small API for a tool (sqlgen2) that generates SQL functions for specified struct types.

Lighter than a full-blown ORM and simpler than hand-written code, the output makes it easy to write flexible yet reliable and high-performance database code.

See the README for further details: https://github.com/rickb777/sqlapi/blob/master/README.md

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Named 

func Named(name string, value interface{}) sql.NamedArg

Named creates NamedArg values; it is synonymous with sql.Named().

func NamedArgString 

func NamedArgString(arg sql.NamedArg) string

NamedArgString converts the argument to a string of the form "name=value".

Types

type Batcher 

type Batcher interface {
	// BeginBatch exposes the pgx batch operations.
	BeginBatch() *pgx.Batch
}

type CanPostGet 

type CanPostGet interface {
	PostGet() error
}

CanPostGet is implemented by value types that need a hook to run just after their data is fetched from the database.

type CanPreInsert 

type CanPreInsert interface {
	PreInsert() error
}

CanPreInsert is implemented by value types that need a hook to run just before their data is inserted into the database.

type CanPreUpdate 

type CanPreUpdate interface {
	PreUpdate() error
}

CanPreUpdate is implemented by value types that need a hook to run just before their data is updated in the database.

type DBStats 

type DBStats = sql.DBStats

type Database 

type Database interface {
	DB() Execer
	Dialect() dialect.Dialect
	Logger() pgx.Logger
	Wrapper() interface{}
	PingContext(ctx context.Context) error
	Ping() error
	Stats() DBStats

	TraceLogging(on bool)
	//LogQuery(query string, args ...interface{})
	LogIfError(err error) error
	LogError(err error) error

	ListTables(re *regexp.Regexp) (util.StringList, error)
}

Database typically wraps a *pgx.ConnPool with a dialect and (optionally) a logger. It's safe for concurrent use by multiple goroutines. See NewDatabase.

func NewDatabase 

func NewDatabase(db SqlDB, dialect dialect.Dialect, wrapper interface{}) Database

NewDatabase creates a new database handler, which wraps the core *sql.DB along with the appropriate dialect.

The wrapper holds some associated data your application needs for this database, if any. Otherwise this should be nil. As with the logger, it cannot be changed after construction.

type Execer 

type Execer interface {
	Getter
	Batcher
	Lgr

	InsertContext(ctx context.Context, query string, args ...interface{}) (int64, error)
	ExecContext(ctx context.Context, sql string, arguments ...interface{}) (int64, error)
	PrepareContext(ctx context.Context, name, sql string) (*pgx.PreparedStatement, error)
	IsTx() bool
}

type Getter 

type Getter interface {
	QueryContext(ctx context.Context, sql string, args ...interface{}) (SqlRows, error)
	QueryExRaw(ctx context.Context, sql string, options *pgx.QueryExOptions, args ...interface{}) (SqlRows, error)
	QueryRowContext(ctx context.Context, query string, args ...interface{}) SqlRow
	QueryRowExRaw(ctx context.Context, query string, options *pgx.QueryExOptions, args ...interface{}) SqlRow
}

type Lgr 

type Lgr interface {
	pgx.Logger
	LogT(level pgx.LogLevel, msg string, startTime *time.Time, data ...interface{})
	TraceLogging(on bool)
}

type Logger 

type Logger = pgx.Logger

type NamedArgList 

type NamedArgList []sql.NamedArg

NamedArgList holds a slice of NamedArgs

func (NamedArgList) Assignments 

func (list NamedArgList) Assignments(q quote.Quoter, from int) []string

Assignments gets the assignment expressions.

func (NamedArgList) Contains 

func (list NamedArgList) Contains(name string) bool

Contains tests whether anything in the list has a certain name.

func (NamedArgList) Exists 

func (list NamedArgList) Exists(fn func(sql.NamedArg) bool) bool

Exists verifies that one or more elements of NamedArgList return true for the passed func.

func (NamedArgList) Find 

func (list NamedArgList) Find(fn func(sql.NamedArg) bool) (sql.NamedArg, bool)

Find returns the first sql.NamedArg that returns true for some function. False is returned if none match.

func (NamedArgList) FindByName 

func (list NamedArgList) FindByName(name string) (sql.NamedArg, bool)

FindByName finds the first item with a particular name.

func (NamedArgList) MkString 

func (list NamedArgList) MkString(sep string) string

MkString produces a string ontainin all the values separated by sep.

func (NamedArgList) Names 

func (list NamedArgList) Names() []string

Names gets all the names.

func (NamedArgList) String 

func (list NamedArgList) String() string

String produces a string ontainin all the values separated by comma.

func (NamedArgList) Values 

func (list NamedArgList) Values() []interface{}

Values gets all the valules

type RowData 

type RowData struct {
	Fields []pgx.FieldDescription
	Data   util.StringAnyMap
}

RowData holds a single row result from the database.

type Rows 

type Rows struct {
	Rows SqlRows
	// contains filtered or unexported fields
}

Rows provides a tool for scanning result *sql.Rows of arbitrary or varying length. The internal *sql.Rows field is exported and is usable as per normal via its Next and Scan methods, or the Next and ScanToMap methods can be used instead.

func WrapRows 

func WrapRows(rows SqlRows) (*Rows, error)

WrapRows wraps a *sql.Rows result so that its data can be scanned into a series of maps, one for each row.

func (*Rows) Close 

func (rams *Rows) Close()

Close closes the Rows, preventing further enumeration. If Next is called and returns false and there are no further result sets, the Rows are closed automatically and it will suffice to check the result of Err. Close is idempotent and does not affect the result of Err.

func (*Rows) Err 

func (rams *Rows) Err() error

Err returns the error, if any, that was encountered during iteration. Err may be called after an explicit or implicit Close.

func (*Rows) FieldDescriptions 

func (rams *Rows) FieldDescriptions() []pgx.FieldDescription

func (*Rows) Next 

func (rams *Rows) Next() bool

Next prepares the next result row for reading with the Scan method. It returns true on success, or false if there is no next result row or an error happened while preparing it. Err should be consulted to distinguish between the two cases.

Every call to Scan, even the first one, must be preceded by a call to Next.

func (*Rows) Scan 

func (rams *Rows) Scan(dest ...interface{}) error

Scan copies the columns in the current row into the values pointed at by dest. The number of values in dest must be the same as the number of columns in the wrapped Rows.

func (*Rows) ScanToMap 

func (rams *Rows) ScanToMap() (RowData, error)

ScanToMap copies all the column data of the current row into a map. The map is keyed by column name.

The result describes a single row from the database, consisting of the column names, types and data.

type SqlDB 

type SqlDB interface {
	Execer
	BeginTx(ctx context.Context, opts *pgx.TxOptions) (SqlTx, error)
	Transact(ctx context.Context, txOptions *pgx.TxOptions, fn func(Execer) error) error
	PingContext(ctx context.Context) error
	Stats() sql.DBStats
	Close()
}

SqlDB is able to make queries and begin transactions.

func Connect 

func Connect(config pgx.ConnConfig, lgr pgx.Logger, logLevel pgx.LogLevel) SqlDB

func ConnectEnv 

func ConnectEnv(lgr pgx.Logger, logLevel pgx.LogLevel) SqlDB

func WrapDB 

func WrapDB(pool *pgx.ConnPool, lgr pgx.Logger) SqlDB

type SqlRow 

type SqlRow interface {
	Scan(dest ...interface{}) error
}

SqlRow is a precis of *sql.Row.

type SqlRows 

type SqlRows interface {
	SqlRow

	// Next prepares the next row for reading. It returns true if there is another
	// row and false if no more rows are available. It automatically closes rows
	// when all rows are read.
	Next() bool

	FieldDescriptions() []pgx.FieldDescription

	// Values returns an array of the row values
	Values() ([]interface{}, error)

	// Close closes the rows, making the connection ready for use again. It is safe
	// to call Close after rows is already closed.
	Close()

	Err() error
}

SqlRows is a precis of *sql.Rows.

type SqlStmt 

type SqlStmt interface {
	// ExecContext executes a query without returning any rows.
	// The args are for any placeholder parameters in the query.
	ExecContext(ctx context.Context, args ...interface{}) (sql.Result, error)

	// QueryContext executes a query that returns rows, typically a SELECT.
	// The args are for any placeholder parameters in the query.
	QueryContext(ctx context.Context, args ...interface{}) (*pgx.Rows, error)

	// QueryRowContext executes a query that is expected to return at most one row.
	// QueryRowContext always returns a non-nil value. Errors are deferred until
	// Row's Scan method is called.
	// If the query selects no rows, the *Row's Scan will return ErrNoRows.
	// Otherwise, the *Row's Scan scans the first selected row and discards
	// the rest.
	QueryRowContext(ctx context.Context, args ...interface{}) *pgx.Row

	Close() error
}

SqlStmt is a precis of *sql.Stmt

type SqlTx 

type SqlTx interface {
	Execer
	Commit() error
	Rollback() error
}

SqlTx is a precis of *pgx.Tx

type Table 

type Table interface {
	// Name gets the table name. without prefix
	Name() TableName

	// Database gets the shared database information.
	Database() Database

	// Execer gets the wrapped database or transaction handle.
	Execer() Execer

	// DB gets the wrapped database handle, provided this is not within a transaction.
	// Panics if it is in the wrong state - use IsTx() if necessary.
	DB() SqlDB

	// Tx gets the wrapped transaction handle, provided this is within a transaction.
	// Panics if it is in the wrong state - use IsTx() if necessary.
	Tx() SqlTx

	// IsTx tests whether this is within a transaction.
	IsTx() bool

	// Ctx gets the current request context.
	Ctx() context.Context

	// Dialect gets the database dialect.
	Dialect() dialect.Dialect

	// Logger gets the trace logger.
	Logger() pgx.Logger

	// Query is the low-level request method for this table. The query is logged using whatever logger is
	// configured. If an error arises, this too is logged.
	//
	// If you need a context other than the background, use WithContext before calling Query.
	//
	// The args are for any placeholder parameters in the query.
	//
	// The caller must call rows.Close() on the result.
	Query(query string, args ...interface{}) (SqlRows, error)
}

Table provides the generic features of each generated table handler.

type TableCreator 

type TableCreator interface {
	Table

	// CreateTable creates the database table.
	CreateTable(ifNotExists bool) (int64, error)

	// DropTable drops the database table.
	DropTable(ifExists bool) (int64, error)

	// Truncate empties the table
	Truncate(force bool) (err error)
}

TableCreator is a table with create/delete/truncate methods.

type TableName 

type TableName struct {
	// Prefix on the table name. It can be used as the schema name, in which case
	// it should include the trailing dot. Or it can be any prefix as needed.
	Prefix string

	// The principal name of the table.
	Name string
}

TableName holds a two-part name. The prefix part is optional.

func (TableName) PrefixWithoutDot 

func (tn TableName) PrefixWithoutDot() string

PrefixWithoutDot return the prefix; if this ends with a dot, the dot is removed.

func (TableName) String 

func (tn TableName) String() string

String gets the full table name.

type TableWithCrud 

type TableWithCrud interface {
	Table

	// QueryOneNullString is a low-level access method for one string. This can be used for function queries and
	// such like. If the query selected many rows, only the first is returned; the rest are discarded.
	// If not found, the result will be invalid.
	QueryOneNullString(req require.Requirement, query string, args ...interface{}) (result sql.NullString, err error)

	// QueryOneNullInt64 is a low-level access method for one int64. This can be used for 'COUNT(1)' queries and
	// such like. If the query selected many rows, only the first is returned; the rest are discarded.
	// If not found, the result will be invalid.
	QueryOneNullInt64(req require.Requirement, query string, args ...interface{}) (result sql.NullInt64, err error)

	// QueryOneNullFloat64 is a low-level access method for one float64. This can be used for 'AVG(...)' queries and
	// such like. If the query selected many rows, only the first is returned; the rest are discarded.
	// If not found, the result will be invalid.
	QueryOneNullFloat64(req require.Requirement, query string, args ...interface{}) (result sql.NullFloat64, err error)

	// Exec executes a query.
	//
	// It places a requirement, which may be nil, on the number of affected rows: this
	// controls whether an error is generated when this expectation is not met.
	//
	// It returns the number of rows affected (if the DB supports that).
	Exec(req require.Requirement, query string, args ...interface{}) (int64, error)

	// CountWhere counts records that match a 'where' predicate.
	CountWhere(where string, args ...interface{}) (count int64, err error)

	// Count counts records that match a 'where' predicate.
	Count(where where.Expression) (count int64, err error)

	// UpdateFields writes new values to the specified columns for rows that match the 'where' predicate.
	// It returns the number of rows affected (if the DB supports that).
	UpdateFields(req require.Requirement, where where.Expression, fields ...sql.NamedArg) (int64, error)

	// Delete deletes rows that match the 'where' predicate.
	// It returns the number of rows affected (if the DB supports that).
	Delete(req require.Requirement, wh where.Expression) (int64, error)
}

TableWithCrud is a table with a selection of generic access methods. Note that most access methods on concrete table types are strongly-typed so don't appear here.

type TableWithIndexes 

type TableWithIndexes interface {
	TableCreator

	// CreateIndexes creates the indexes for the database table.
	CreateIndexes(ifNotExist bool) (err error)

	// DropIndexes executes a query that drops all the indexes on the database table.
	DropIndexes(ifExist bool) (err error)

	// CreateTableWithIndexes creates the database table and its indexes.
	CreateTableWithIndexes(ifNotExist bool) (err error)
}

TableWithIndexes is a table creator with create/delete methods for the indexes.

Source Files

View all Source files

Directories

Path Synopsis
Package constraint provides types and methods to support foreign-key relationshipd between database tables.
 Package constraint provides types and methods to support foreign-key relationshipd between database tables.
Package logadapter provides a logger that writes to a log.Logger log.
 Package logadapter provides a logger that writes to a log.Logger log.
Package vanilla provides a re-usable table API.
 Package vanilla provides a re-usable table API.

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