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查询构建器.go
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查询构建器.go
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package edb
import (
"errors"
"fmt"
"strconv"
"strings"
)
type MySQLQueryBuilder struct {
db *Mysql数据库操作类
selectCols []string
fromTable string
whereConds []string
whereArgs []interface{}
orWhereConds []string
orWhereArgs []interface{}
orderCols []string
limit []int64
isDeleteQuery bool
}
func NewMySQLQueryBuilder() *MySQLQueryBuilder {
return &MySQLQueryBuilder{}
}
func NewMySQL查询构建器(db *Mysql数据库操作类) *MySQLQueryBuilder {
return &MySQLQueryBuilder{
db: db,
}
}
func (qb *MySQLQueryBuilder) Select(cols ...string) *MySQLQueryBuilder {
qb.selectCols = cols
return qb
}
func (qb *MySQLQueryBuilder) From(table string) *MySQLQueryBuilder {
qb.fromTable = table
//执行后清空所有的条件
qb.whereConds = nil
qb.whereArgs = nil
qb.orWhereConds = nil
qb.orWhereArgs = nil
qb.orderCols = nil
qb.limit = nil
return qb
}
func (qb *MySQLQueryBuilder) Where(column string, operator string, value interface{}) *MySQLQueryBuilder {
qb.whereConds = append(qb.whereConds, fmt.Sprintf("%s %s ?", column, operator))
qb.whereArgs = append(qb.whereArgs, value)
return qb
}
func (qb *MySQLQueryBuilder) OrWhere(column string, operator string, value interface{}) *MySQLQueryBuilder {
qb.orWhereConds = append(qb.orWhereConds, fmt.Sprintf("%s %s ?", column, operator))
qb.orWhereArgs = append(qb.orWhereArgs, value)
return qb
}
func (qb *MySQLQueryBuilder) OrderBy(cols ...string) *MySQLQueryBuilder {
qb.orderCols = cols
return qb
}
func (qb *MySQLQueryBuilder) Limit(offset, limit int64) *MySQLQueryBuilder {
qb.limit = []int64{offset, limit}
return qb
}
func (qb *MySQLQueryBuilder) Paginate(total int64, current_pages int64) *MySQLQueryBuilder {
if current_pages <= 0 {
current_pages = 1
}
current_pages = (current_pages - 1) * total
qb.limit = []int64{current_pages, total}
return qb
}
func (qb *MySQLQueryBuilder) Count() (int64, error) {
//copy一个新的对象返回
countQueryBuilder := NewMySQL查询构建器(qb.db)
countQueryBuilder.selectCols = []string{"count(*) as count"}
countQueryBuilder.fromTable = qb.fromTable
countQueryBuilder.whereArgs = qb.whereArgs
countQueryBuilder.whereConds = qb.whereConds
countQueryBuilder.orWhereArgs = qb.orWhereArgs
countQueryBuilder.orWhereConds = qb.orWhereConds
return countQueryBuilder.GetInt()
}
func (qb *MySQLQueryBuilder) ToSQL() (string, []interface{}) {
var sb strings.Builder
args := make([]interface{}, 0, len(qb.selectCols)+len(qb.whereArgs)+len(qb.orWhereArgs)+len(qb.orderCols)+2)
if qb.isDeleteQuery {
sb.WriteString("DELETE FROM ")
sb.WriteString(qb.fromTable)
} else {
sb.WriteString("SELECT ")
if len(qb.selectCols) == 0 {
sb.WriteString("*")
} else {
sb.WriteString(strings.Join(qb.selectCols, ", "))
}
sb.WriteString(" FROM ")
sb.WriteString(qb.fromTable)
}
if len(qb.whereConds) > 0 || len(qb.orWhereConds) > 0 {
sb.WriteString(" WHERE ")
// Join WHERE conditions
if len(qb.whereConds) > 0 {
sb.WriteString(strings.Join(qb.whereConds, " AND "))
args = append(args, qb.whereArgs...)
}
// Join OR WHERE conditions
if len(qb.orWhereConds) > 0 {
if len(qb.whereConds) > 0 {
sb.WriteString(" OR ")
}
sb.WriteString(strings.Join(qb.orWhereConds, " OR "))
args = append(args, qb.orWhereArgs...)
}
}
if !qb.isDeleteQuery && len(qb.orderCols) > 0 {
sb.WriteString(" ORDER BY ")
sb.WriteString(strings.Join(qb.orderCols, " "))
}
if !qb.isDeleteQuery && len(qb.limit) > 0 {
sb.WriteString(" LIMIT " + strconv.FormatInt(qb.limit[0], 10) + "," + strconv.FormatInt(qb.limit[1], 10))
}
query := sb.String()
return query, args
}
func (qb *MySQLQueryBuilder) Get() ([]map[string]interface{}, error) {
query, args := qb.ToSQL()
fmt.Println("query", query)
fmt.Println("args", args)
rows, err := qb.db.QueryRaw(query, args)
if err != nil {
return nil, err
}
return rows, nil
}
func (qb *MySQLQueryBuilder) GetInt() (int64, error) {
query, args := qb.ToSQL()
fmt.Println("query", query)
fmt.Println("args", args)
rows, err := qb.db.CountRaw(query, args)
if err != nil {
return 0, err
}
return rows, nil
}
func (qb *MySQLQueryBuilder) First() (map[string]interface{}, error) {
//设置limit=1
qb.limit = []int64{0, 1}
query, args := qb.ToSQL()
fmt.Println("query", query)
fmt.Println("args", args)
result, err := qb.db.QueryRaw(query, args)
if err != nil {
return nil, err
}
if len(result) == 0 {
return nil, errors.New("not found")
}
return result[0], nil
}
func (qb *MySQLQueryBuilder) Delete() (int64, error) {
qb.isDeleteQuery = true
query, args := qb.ToSQL()
qb.isDeleteQuery = false
fmt.Println("query", query, "args", args)
i, err := qb.db.ExecRaw(query, args)
if err != nil {
return 0, err
}
return i, nil
}
func (qb *MySQLQueryBuilder) Insert(data map[string]interface{}) (int64, error) {
columns := make([]string, 0)
values := make([]interface{}, 0)
for column, value := range data {
columns = append(columns, column)
values = append(values, value)
}
columnStr := strings.Join(columns, ", ")
valueStr := strings.Repeat("?, ", len(columns))
valueStr = valueStr[:len(valueStr)-2]
query := fmt.Sprintf("INSERT INTO %s (%s) VALUES (%s)", qb.fromTable, columnStr, valueStr)
fmt.Println("INSERT", query)
stmt, err := qb.db.db.Prepare(query)
if err != nil {
return 0, err
}
defer stmt.Close()
res, err := stmt.Exec(values...)
if err != nil {
return 0, err
}
id, err := res.LastInsertId()
if err != nil {
return 0, err
}
return id, nil
}
func (qb *MySQLQueryBuilder) Update(data map[string]interface{}) (int64, error) {
if len(data) == 0 {
return 0, errors.New("no data provided for update")
}
setValues := make([]string, 0)
setArgs := make([]interface{}, 0)
for column, value := range data {
setValues = append(setValues, fmt.Sprintf("%s = ?", column))
setArgs = append(setArgs, value)
}
setStr := strings.Join(setValues, ", ")
whereStr, whereArgs := qb.getWhereClause()
args := append(setArgs, whereArgs...)
query := fmt.Sprintf("UPDATE %s SET %s%s", qb.fromTable, setStr, whereStr)
fmt.Println("UPDATE", query)
fmt.Println("args", args)
stmt, err := qb.db.db.Prepare(query)
if err != nil {
return 0, err
}
defer stmt.Close()
res, err := stmt.Exec(args...)
if err != nil {
return 0, err
}
rowsAffected, err := res.RowsAffected()
if err != nil {
return 0, err
}
return rowsAffected, nil
}
func (qb *MySQLQueryBuilder) getWhereClause() (string, []interface{}) {
whereClause := ""
args := make([]interface{}, 0)
if len(qb.whereConds) > 0 || len(qb.orWhereConds) > 0 {
whereClause += " WHERE "
// Join WHERE conditions
if len(qb.whereConds) > 0 {
whereClause += strings.Join(qb.whereConds, " AND ")
args = append(args, qb.whereArgs...)
}
// Join OR WHERE conditions
if len(qb.orWhereConds) > 0 {
if len(qb.whereConds) > 0 {
whereClause += " OR "
}
whereClause += strings.Join(qb.orWhereConds, " OR ")
args = append(args, qb.orWhereArgs...)
}
}
return whereClause, args
}