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xsql.go
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xsql.go
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//extends for the sql package.
//power by <Joshua Conero>(2020)
package xsql
import (
"database/sql"
"fmt"
"log"
"strings"
)
//@todo this package maybe will move to `conero/uymas`
type Query struct {
DB *sql.DB
RowCount int //the count query result lines.
}
//select
func (c *Query) Select(query string, args ...interface{}) ([]map[string]interface{}, error) {
db := c.DB
rows, err := db.Query(query, args...)
if err != nil {
return nil, err
}
return c.RowsDick(rows)
}
//reference link: https://blog.csdn.net/weimingjue/article/details/91042649
//get the rows dick
//database map to golang type:
// INT int64
// SMALLINT,TINYINT int
// DECIMAL float64
// DATETIME,DATE time.Time; <!temp make to string>
// VARCHAR,CHAR,TEXT string
func (c *Query) RowsDick(rows *sql.Rows) ([]map[string]interface{}, error) {
defer rows.Close()
columns, err := rows.Columns()
if err != nil {
return nil, err
}
cTypes, err := rows.ColumnTypes()
if err != nil {
return nil, err
}
receive := make([]interface{}, len(columns))
for index, _ := range receive {
cType := cTypes[index]
dataTypeStr := strings.ToUpper(cType.DatabaseTypeName())
switch dataTypeStr {
//@todo fail to map
//case "DATETIME", "DATE":
// var a interface{}
// receive[index] = &a
case "INT", "SMALLINT", "TINYINT", "BIT", "BOOL", "BOOLEAN", "MEDIUMINT", "INTEGER",
"BIGINT", "YEAR", "TIMESTAMP":
var a sql.NullInt64
receive[index] = &a
case "VARCHAR", "CHAR", "TEXT", "BINARY", "VARBINARY", "TINYBLOB", "TINYTEXT", "BLOB",
"MEDIUMBLOB", "MEDIUMTEXT", "LONGBLOB", "LONGTEXT":
var a sql.NullString
receive[index] = &a
case "DECIMAL", "FLOAT", "DOUBLE", "NUMERIC":
var a sql.NullFloat64
receive[index] = &a
default:
var a interface{}
receive[index] = &a
}
}
var dataList []map[string]interface{}
var counter = 0
for rows.Next() {
if err := rows.Scan(receive...); err != nil {
log.Fatal(err)
}
item := make(map[string]interface{})
//get the true value
for index, v := range receive {
cType := cTypes[index]
col := columns[index]
dataTypeStr := strings.ToUpper(cType.DatabaseTypeName())
switch dataTypeStr {
case "INT", "SMALLINT", "TINYINT", "BIT", "BOOL", "BOOLEAN", "MEDIUMINT", "INTEGER",
"BIGINT", "YEAR", "TIMESTAMP":
var anyVal = *v.(*sql.NullInt64)
if anyVal.Valid {
item[col] = anyVal.Int64
} else {
item[col] = nil
}
case "DATETIME", "DATE", "TIME":
tmpValue := *v.(*interface{})
var timeStr string
if tmpValue != nil {
timeStr = fmt.Sprintf("%s", tmpValue)
}
item[col] = timeStr
case "VARCHAR", "CHAR", "TEXT", "BINARY", "VARBINARY", "TINYBLOB", "TINYTEXT", "BLOB",
"MEDIUMBLOB", "MEDIUMTEXT", "LONGBLOB", "LONGTEXT":
var anyVal = *v.(*sql.NullString)
if anyVal.Valid {
item[col] = anyVal.String
} else {
item[col] = ""
}
case "DECIMAL", "FLOAT", "DOUBLE", "NUMERIC":
var anyVal = *v.(*sql.NullFloat64)
if anyVal.Valid {
item[col] = anyVal.Float64
} else {
item[col] = nil
}
default:
item[col] = *v.(*interface{})
}
}
dataList = append(dataList, item)
counter += 1
}
c.RowCount = counter
return dataList, nil
}
func NewQuery(db *sql.DB) *Query {
query := &Query{
DB: db,
}
return query
}