dbutil

package
v2.1.4+incompatible Latest Latest
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 Go to latest Published: Feb 13, 2019 License: Apache-2.0 Imports: 18 Imported by: 0

README

dbutil library

dbutil is a library that contains a collection of auxiliary functions related to MySQL and TiDB.

Documentation

Index

Constants

View Source 
const (
	// ImplicitColName is name of implicit column in TiDB
	ImplicitColName = "_tidb_rowid"

	// ImplicitColID is ID implicit column in TiDB
	ImplicitColID = -1
)

Variables

View Source 
var (
	// ErrVersionNotFound means can't get the database's version
	ErrVersionNotFound = errors.New("can't get the database's version")

	// ErrNoData means no data in table
	ErrNoData = errors.New("no data found")
)

Functions

func AnalyzeValuesFromBuckets 

func AnalyzeValuesFromBuckets(valueString string, cols []*model.ColumnInfo) ([]string, error)

AnalyzeValuesFromBuckets analyze upperBound or lowerBound to string for each column. upperBound and lowerBound are looks like '(123, abc)' for multiple fields, or '123' for one field.

func BuildColumnsAndConstraints 

func BuildColumnsAndConstraints(colDefs []*ast.ColumnDef, constraints []*ast.Constraint) ([]*model.ColumnInfo, []*ast.Constraint)

BuildColumnsAndConstraints reference https://github.com/pingcap/tidb/blob/12c87929b8444571b9e84d2c0d5b85303d27da64/ddl/ddl_api.go#L168

func BuildTableInfo 

func BuildTableInfo(tableName model.CIStr, columns []*model.ColumnInfo, constraints []*ast.Constraint) (tbInfo *model.TableInfo, err error)

BuildTableInfo builds table infomation using column constraints.

func CloseDB 

func CloseDB(db *sql.DB) error

CloseDB closes the mysql fd

func DecodeTimeInBucket 

func DecodeTimeInBucket(packedStr string) (string, error)

DecodeTimeInBucket decodes Time from a packed uint64 value.

func EqualTableInfo 

func EqualTableInfo(tableInfo1, tableInfo2 *model.TableInfo) bool

EqualTableInfo returns true if this two table info have same columns and indices

func FindAllColumnWithIndex 

func FindAllColumnWithIndex(tableInfo *model.TableInfo) []*model.ColumnInfo

FindAllColumnWithIndex returns columns with index, order is pk, uk and normal index.

func FindAllIndex 

func FindAllIndex(tableInfo *model.TableInfo) []*model.IndexInfo

FindAllIndex returns all index, order is pk, uk, and normal index.

func FindColumnByName 

func FindColumnByName(cols []*model.ColumnInfo, name string) *model.ColumnInfo

FindColumnByName finds column by name.

func FindSuitableColumnWithIndex 

func FindSuitableColumnWithIndex(ctx context.Context, db *sql.DB, schemaName string, tableInfo *model.TableInfo) (*model.ColumnInfo, error)

FindSuitableColumnWithIndex returns first column of a suitable index. The priority is * primary key * unique key * normal index which has max cardinality

func GetBucketsInfo 

func GetBucketsInfo(ctx context.Context, db *sql.DB, schema, table string, tableInfo *model.TableInfo) (map[string][]Bucket, error)

GetBucketsInfo SHOW STATS_BUCKETS in TiDB.

func GetCRC32Checksum 

func GetCRC32Checksum(ctx context.Context, db *sql.DB, schemaName, tableName string, tbInfo *model.TableInfo, limitRange string, args []interface{}, ignoreColumns map[string]interface{}) (int64, error)

GetCRC32Checksum returns checksum code of some data by given condition

func GetCreateTableSQL 

func GetCreateTableSQL(ctx context.Context, db *sql.DB, schemaName string, tableName string) (string, error)

GetCreateTableSQL returns the create table statement.

func GetDBVersion 

func GetDBVersion(ctx context.Context, db *sql.DB) (string, error)

GetDBVersion returns the database's version

func GetMinMaxValue 

func GetMinMaxValue(ctx context.Context, db *sql.DB, schema, table, column string, limitRange string, limitArgs []interface{}, collation string) (string, string, error)

GetMinMaxValue return min and max value of given column by specified limitRange condition.

func GetRandomValues 

func GetRandomValues(ctx context.Context, db *sql.DB, schemaName, table, column string, num int, limitRange string, limitArgs []interface{}, collation string) ([]string, []int, error)

GetRandomValues returns some random value and these value's count of a column, just like sampling. Tips: limitArgs is the value in limitRange.

func GetRowCount 

func GetRowCount(ctx context.Context, db *sql.DB, schemaName string, tableName string, where string) (int64, error)

GetRowCount returns row count of the table. if not specify where condition, return total row count of the table.

func GetSchemas 

func GetSchemas(ctx context.Context, db *sql.DB) ([]string, error)

GetSchemas returns name of all schemas

func GetTableInfo 

func GetTableInfo(ctx context.Context, db *sql.DB, schemaName string, tableName string) (*model.TableInfo, error)

GetTableInfo returns table information.

func GetTableInfoBySQL 

func GetTableInfoBySQL(createTableSQL string) (table *model.TableInfo, err error)

GetTableInfoBySQL returns table information by given create table sql.

func GetTableInfoWithRowID 

func GetTableInfoWithRowID(ctx context.Context, db *sql.DB, schemaName string, tableName string, useRowID bool) (*model.TableInfo, error)

GetTableInfoWithRowID returns table information with _tidb_rowid column if useRowID is true

func GetTables 

func GetTables(ctx context.Context, db *sql.DB, schemaName string) (tables []string, err error)

GetTables returns name of all tables in the specified schema

func GetTidbLatestTSO 

func GetTidbLatestTSO(ctx context.Context, db *sql.DB) (int64, error)

GetTidbLatestTSO returns tidb's current TSO.

func IsFloatType 

func IsFloatType(tp byte) bool

IsFloatType returns true if tp is float type

func IsNumberType 

func IsNumberType(tp byte) bool

IsNumberType returns true if tp is number type

func IsTiDB 

func IsTiDB(ctx context.Context, db *sql.DB) (bool, error)

IsTiDB returns true if this database is tidb

func IsTimeTypeAndNeedDecode 

func IsTimeTypeAndNeedDecode(tp byte) bool

IsTimeTypeAndNeedDecode returns true if tp is time type and encoded in tidb buckets.

func OpenDB 

func OpenDB(cfg DBConfig) (*sql.DB, error)

OpenDB opens a mysql connection FD

func ReplacePlaceholder 

func ReplacePlaceholder(str string, args []string) string

ReplacePlaceholder will use args to replace '?', used for log. tips: make sure the num of "?" is same with len(args)

func ScanRow 

func ScanRow(rows *sql.Rows) (map[string][]byte, map[string]bool, error)

ScanRow scans rows into a map, and another map specify the value is null or not.

func ScanRowsToInterfaces 

func ScanRowsToInterfaces(rows *sql.Rows) ([][]interface{}, error)

ScanRowsToInterfaces scans rows to interface arrary.

func SelectUniqueOrderKey 

func SelectUniqueOrderKey(tbInfo *model.TableInfo) ([]string, []*model.ColumnInfo)

SelectUniqueOrderKey returns some columns for order by condition.

func SetSnapshot 

func SetSnapshot(ctx context.Context, db *sql.DB, snapshot string) error

SetSnapshot set the snapshot variable for tidb

func ShowBinlogFormat 

func ShowBinlogFormat(ctx context.Context, db *sql.DB) (value string, err error)

ShowBinlogFormat queries variable 'binlog_format' and returns its value.

func ShowBinlogRowImage 

func ShowBinlogRowImage(ctx context.Context, db *sql.DB) (value string, err error)

ShowBinlogRowImage queries variable 'binlog_row_image' and returns its values.

func ShowGrants 

func ShowGrants(ctx context.Context, db *sql.DB, user, host string) ([]string, error)

ShowGrants queries privileges for a mysql user.

func ShowLogBin 

func ShowLogBin(ctx context.Context, db *sql.DB) (value string, err error)

ShowLogBin queries variable 'log_bin' and returns its value.

func ShowMySQLVariable 

func ShowMySQLVariable(ctx context.Context, db *sql.DB, variable string) (value string, err error)

ShowMySQLVariable queries MySQL variable and returns its value.

func ShowServerID 

func ShowServerID(ctx context.Context, db *sql.DB) (serverID uint64, err error)

ShowServerID queries variable 'server_id' and returns its value.

func ShowVersion 

func ShowVersion(ctx context.Context, db *sql.DB) (value string, err error)

ShowVersion queries variable 'version' and returns its value.

func TableName 

func TableName(schema, table string) string

TableName returns `schema`.`table`

Types

type Bucket 

type Bucket struct {
	Count      int64
	LowerBound string
	UpperBound string
}

Bucket saves the bucket information from TiDB.

type DBConfig 

type DBConfig struct {
	Host string `toml:"host" json:"host"`

	Port int `toml:"port" json:"port"`

	User string `toml:"user" json:"user"`

	Password string `toml:"password" json:"password"`

	Schema string `toml:"schema" json:"schema"`
}

DBConfig is database configuration.

func GetDBConfigFromEnv 

func GetDBConfigFromEnv(schema string) DBConfig

GetDBConfigFromEnv returns DBConfig from environment

func (*DBConfig) String 

func (c *DBConfig) String() string

String returns native format of database configuration

type IndexInfo 

type IndexInfo struct {
	Table       string
	NoneUnique  bool
	KeyName     string
	SeqInIndex  int
	ColumnName  string
	Cardinality int
}

IndexInfo contains information of table index.

func ShowIndex 

func ShowIndex(ctx context.Context, db *sql.DB, schemaName string, table string) ([]*IndexInfo, error)

ShowIndex returns result of executing `show index`

Source Files

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