sqlutil

package
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 Go to latest Published: Aug 8, 2020 License: Apache-2.0 Imports: 6 Imported by: 0

README

sqlutil

Package sqlutil provides utilities for Go's database/sql for dealing with SQL queries and database records.

Supports the following features:

  • Mapping structs to sets of columns ([]string) and values ([]interface{})
  • Using structs to build queries with bindings for safe Exec and Query
  • Binding struct fields to query response records
  • Embedding SQL schema as Go code along with an InitSchema helper function

Documentation

Overview

Package sqlutil provides utilities for database/sql for dealing with SQL queries and database records.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type AssignmentList 

type AssignmentList struct {
	// contains filtered or unexported fields
}

AssignmentList represents a list of assignments for the UPDATE command.

func Assign 

func Assign() *AssignmentList

Assign returns an empty AssignmentList.

func (*AssignmentList) Equal 

func (al *AssignmentList) Equal(k string, v interface{}) *AssignmentList

Equal adds k=v to the list.

func (*AssignmentList) Literal 

func (al *AssignmentList) Literal(l string) *AssignmentList

Literal adds literal string l to the list.

func (*AssignmentList) String 

func (al *AssignmentList) String() string

String returns the query.

func (*AssignmentList) Values 

func (al *AssignmentList) Values() []interface{}

Values returns the values associated to each assignment.

type DeleteStmt 

type DeleteStmt struct {
	// contains filtered or unexported fields
}

DeleteStmt represents a DELETE statement.

func Delete 

func Delete() *DeleteStmt

Delete creates and initializes a new DELETE statement.

func (*DeleteStmt) From 

func (s *DeleteStmt) From(tables ...string) *DeleteStmt

From adds the FROM part of the statement.

func (*DeleteStmt) Literal 

func (s *DeleteStmt) Literal(l string) *DeleteStmt

Literal adds literal string l to the statement.

func (*DeleteStmt) QueryArgs 

func (s *DeleteStmt) QueryArgs() []interface{}

QueryArgs returns the values corresponding to bindings (?, ?) from all calls to Where. e.g. db.Exec(stmt.String(), stmt.QueryArgs()...)

func (*DeleteStmt) String 

func (s *DeleteStmt) String() string

String returns the statement.

func (*DeleteStmt) Where 

func (s *DeleteStmt) Where(cond *QueryConditionSet) *DeleteStmt

Where adds the WHERE statement followed by conditions to the statement.

type InsertStmt 

type InsertStmt struct {
	// contains filtered or unexported fields
}

InsertStmt represents the INSERT statement.

func Insert 

func Insert() *InsertStmt

Insert creates and initializes a new INSERT statement.

func Replace 

func Replace() *InsertStmt

Replace creates and initializes a new REPLACE statement. Backed by InsertStmt to be used interchangeably.

func (*InsertStmt) Fields 

func (s *InsertStmt) Fields(fields ...string) *InsertStmt

Fields adds the (f1, fN) part of the insert part of the statement.

func (*InsertStmt) Into 

func (s *InsertStmt) Into(table string) *InsertStmt

Into adds the INTO part of the statement.

func (*InsertStmt) Literal 

func (s *InsertStmt) Literal(l string) *InsertStmt

Literal adds literal string l to the statement.

func (*InsertStmt) QueryArgs 

func (s *InsertStmt) QueryArgs() []interface{}

QueryArgs returns the values corresponding to bindings (?, ?) from all calls to Values. e.g. db.Exec(stmt.String(), stmt.QueryArgs()...)

func (*InsertStmt) Select 

func (s *InsertStmt) Select(stmt *SelectStmt) *InsertStmt

Select adds a Select to the statement.

func (*InsertStmt) String 

func (s *InsertStmt) String() string

String returns the statement.

func (*InsertStmt) Values 

func (s *InsertStmt) Values(records ...Record) *InsertStmt

Values adds the (v1, vN) part of the insert part of the statement. Each record is added to the statement as a set of bindings (?, ?), and their values recorded. Use QueryArgs to get the values recorded.

type NullTime 

type NullTime struct {
	Time  time.Time
	Valid bool // Valid is true if Time is not NULL
}

NullTime represents a time.Time that may be null. NullTime implements the sql.Scanner interface so it can be used as a scan destination, similar to sql.NullString.

code borrowed from github.com/lib/pq

func (*NullTime) Scan 

func (nt *NullTime) Scan(value interface{}) error

Scan implements the Scanner interface.

func (NullTime) Value 

func (nt NullTime) Value() (driver.Value, error)

Value implements the driver Valuer interface.

type QueryConditionSet 

type QueryConditionSet struct {
	// contains filtered or unexported fields
}

QueryConditionSet represents a set of database query conditions.

func Cond 

func Cond() *QueryConditionSet

Cond returns an empty QueryConditioSet.

func (*QueryConditionSet) And 

func (c *QueryConditionSet) And() *QueryConditionSet

And adds AND to the set.

func (*QueryConditionSet) Equal 

func (c *QueryConditionSet) Equal(k string, v interface{}) *QueryConditionSet

Equal adds k=v to the set.

func (*QueryConditionSet) Group 

func (c *QueryConditionSet) Group(cond *QueryConditionSet) *QueryConditionSet

Group adds (cond) to the set.

func (*QueryConditionSet) In 

func (c *QueryConditionSet) In(k string, v interface{}) *QueryConditionSet

In adds k IN (v) to the condition set. v must be a slice of any type or a *SelectStmt.

func (*QueryConditionSet) InSelect 

func (c *QueryConditionSet) InSelect(k string, v *SelectStmt) *QueryConditionSet

InSelect adds k IN (select) to the condition set.

func (*QueryConditionSet) IsNull 

func (c *QueryConditionSet) IsNull(v string) *QueryConditionSet

IsNull adds v IS NULL to the query.

func (*QueryConditionSet) Literal 

func (c *QueryConditionSet) Literal(l string) *QueryConditionSet

Literal adds literal string l to the condition.

func (*QueryConditionSet) Not 

func (c *QueryConditionSet) Not() *QueryConditionSet

Not adds NOT to the set.

func (*QueryConditionSet) Or 

func (c *QueryConditionSet) Or() *QueryConditionSet

Or adds OR to the set.

func (*QueryConditionSet) String 

func (c *QueryConditionSet) String() string

String returns the query.

func (*QueryConditionSet) Values 

func (c *QueryConditionSet) Values() []interface{}

Values returns the values associated to each condition.

type Record 

type Record interface {
	Subset(...string) Record // Subset returns a subset of the record fields.
	Fields() []string        // Fields return the struct field name to be used as table column
	Values() []interface{}   // Values return the struct field value to be used in Scan
}

Record represents a database record. See RecordType for mapping structs to Records.

type RecordType 

type RecordType struct {
	T interface{}
}

RecordType implements the Record interface for any struct with 'sql' tags as T.

func NewRecordType 

func NewRecordType(T interface{}) RecordType

NewRecordType creates and initializes a new RecordType.

func (RecordType) Fields 

func (r RecordType) Fields() []string

Fields returns a list of table column names from struct fields. Uses the 'db' tag if available.

func (RecordType) Subset 

func (r RecordType) Subset(fields ...string) Record

Subset returns a subset of the struct fields from r.T.

func (RecordType) Values 

func (r RecordType) Values() []interface{}

Values returns a list of table column values from struct fields. These values are suitable for Row.Scan from Exec (e.g. INSERT, REPLACE) calls.

type Records 

type Records []Record

Records implements the Record interface for a slice of Records.

func NewRecords 

func NewRecords(T interface{}) Records

NewRecords creates and initializes new Records from slice of any struct.

func (Records) Fields 

func (r Records) Fields() []string

Fields returns a list of table column names from the first Record.

func (Records) Subset 

func (r Records) Subset(fields ...string) Record

Subset returns Records with a subset of their fields.

In order to use the Subset of Records (a []Record), one needs to type assert it: rows.Scan(NewRecords(&r).Subset("a", "b").(Records)...).

func (Records) Values 

func (r Records) Values() []interface{}

Values returns a list of table column values from all Records.

type SelectStmt 

type SelectStmt struct {
	// contains filtered or unexported fields
}

SelectStmt represents a SELECT statement.

func Select 

func Select(fields ...string) *SelectStmt

Select creates and initializes a new SELECT statement.

func (*SelectStmt) From 

func (s *SelectStmt) From(tables ...string) *SelectStmt

From adds the FROM part of the statement.

func (*SelectStmt) Literal 

func (s *SelectStmt) Literal(l string) *SelectStmt

Literal adds literal string l to the statement. Useful for e.g. UNION, JOIN, LIMIT.

func (*SelectStmt) QueryArgs 

func (s *SelectStmt) QueryArgs() []interface{}

QueryArgs returns the values corresponding to bindings (?, ?) from all calls to Where. e.g. db.Query(stmt.String(), stmt.QueryArgs()...)

func (*SelectStmt) Select 

func (s *SelectStmt) Select(a *SelectStmt) *SelectStmt

Select adds another Select statement to the statement. e.g. Select("*").From().Select(...)

func (*SelectStmt) SelectGroup 

func (s *SelectStmt) SelectGroup(as string, g *SelectStmt) *SelectStmt

SelectGroup adds another SelectStmt to the statement, as a group, with an optional alias.

func (*SelectStmt) String 

func (s *SelectStmt) String() string

String returns the statement.

func (*SelectStmt) Where 

func (s *SelectStmt) Where(cond *QueryConditionSet) *SelectStmt

Where adds the WHERE statement followed by conditions to the statement.

type UpdateStmt 

type UpdateStmt struct {
	// contains filtered or unexported fields
}

UpdateStmt represents the UPDATE statement.

func Update 

func Update(tables ...string) *UpdateStmt

Update creates and initializes a new UPDATE statement.

func (*UpdateStmt) QueryArgs 

func (s *UpdateStmt) QueryArgs() []interface{}

QueryArgs returns the values corresponding to bindings (?, ?) from all calls to Set and Where. e.g. db.Exec(stmt.String(), stmt.QueryArgs()...)

func (*UpdateStmt) Set 

func (s *UpdateStmt) Set(al *AssignmentList) *UpdateStmt

Set adds the SET part of the statement.

func (*UpdateStmt) String 

func (s *UpdateStmt) String() string

String returns the statement.

func (*UpdateStmt) Where 

func (s *UpdateStmt) Where(cond *QueryConditionSet) *UpdateStmt

Where adds the WHERE part of the statement.

Source Files

View all Source files

Directories

Path Synopsis
b64schema converts a SQL schema file into base64 encoded strings as Go code.
 b64schema converts a SQL schema file into base64 encoded strings as Go code.

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