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info.go
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/
info.go
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package info
import (
"database/sql"
"fmt"
"github.com/jmoiron/sqlx"
)
type ColumnInfo struct {
ColumnDefault sql.NullString `db:"COLUMN_DEFAULT"`
IsNullable string `db:"IS_NULLABLE"`
ColumnType string `db:"COLUMN_TYPE"`
ColumnKey string `db:"COLUMN_KEY"`
ColumnKeysInfo []*IndexInfo
}
func (ci *ColumnInfo) Nullable() bool {
return ci.IsNullable == "YES"
}
func (ci *ColumnInfo) HasDefault() (bool, string) {
hasDefault := ci.ColumnDefault.String != ""
return hasDefault, ci.ColumnDefault.String
}
func (ci *ColumnInfo) IsUnique() bool {
for _, k := range ci.ColumnKeysInfo {
if k.IsUnique() {
return true
}
}
return false
}
func (ci *ColumnInfo) GetUniqueKey() *IndexInfo {
for _, k := range ci.ColumnKeysInfo {
if k.IsUnique() {
return k
}
}
return nil
}
func (ci *ColumnInfo) IsPrimary() bool {
for _, k := range ci.ColumnKeysInfo {
if k.IsPrimary() {
return true
}
}
return false
}
func GetColumnInfo(table, column string, db *sqlx.DB) *ColumnInfo {
ci := &ColumnInfo{}
_ = db.Get(ci, "SELECT COLUMN_DEFAULT, IS_NULLABLE, COLUMN_TYPE, COLUMN_KEY FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name=? AND COLUMN_NAME=?;",
table, column)
if ci.ColumnType == "" {
return nil
}
ci.ColumnKeysInfo = GetIndexInfoByColumn(table, column, db)
return ci
}
type IndexInfo struct {
NonUnique int `db:"Non_unique"`
KeyName string `db:"Key_name"`
}
func (ii *IndexInfo) IsUnique() bool {
return ii.NonUnique != 1 && ii.KeyName != "PRIMARY"
}
func (ii *IndexInfo) IsPrimary() bool {
return ii.NonUnique != 1 && ii.KeyName == "PRIMARY"
}
func (ii *IndexInfo) IsForeign() bool {
return ii.NonUnique != 0
}
func GetIndexInfoByColumn(table, column string, db *sqlx.DB) []*IndexInfo {
var ii []*IndexInfo
_ = db.Select(&ii, fmt.Sprintf("SHOW INDEXES FROM %v WHERE Column_name='%v';", table, column))
return ii
}
func GetIndexInfoByTable(table string, db *sqlx.DB) []*IndexInfo {
var ii []*IndexInfo
_ = db.Select(&ii, fmt.Sprintf("SHOW INDEXES FROM %v;", table))
return ii
}
type KeyInfo struct {
ConstraintName string `db:"CONSTRAINT_NAME"`
TableName string `db:"TABLE_NAME"`
ColumnName string `db:"COLUMN_NAME"`
ReferencedTableName string `db:"REFERENCED_TABLE_NAME"`
ReferencedColumnName string `db:"REFERENCED_COLUMN_NAME"`
}
func GetKeyInfo(name string, db *sqlx.DB) *KeyInfo {
var ki []*KeyInfo
_ = db.Select(&ki, fmt.Sprintf("SELECT CONSTRAINT_NAME, TABLE_NAME, COLUMN_NAME, REFERENCED_TABLE_NAME, REFERENCED_COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE CONSTRAINT_NAME='%v';", name))
if len(ki) < 1 {
return nil
}
return ki[0]
}