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basemanager.go
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basemanager.go
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package models
import (
"database/sql"
"fmt"
"strings"
)
// Table Helpers
type TableColumns []string
type Table struct {
Name string
Columns TableColumns
PkColumn string
}
type TableManager interface {
// Get Operations
GetOne(*Query) []BaseModel
GetMultiple(*Query) []BaseModel
// Creation Operations
CreateOne(*CreateParams) BaseModel
CreateMultiple(*[]BaseModel) []BaseModel
// Update Operations
UpdateOne(*UpdateParams) int
UpdateMultiple(*UpdateParams) int
// Delete Operations
DeleteOne(*DeleteParams) int
DeleteMultiple(*DeleteParams) int
// helper methods
columnExists(col string) bool
validColumns(tbCols *TableColumns, cols *TableColumns) (bool, error)
// Query Helpers -- should these be privare
BuildCreateStatment(db *sql.DB) (*sql.Stmt, error)
BuildUpdateStatement(db *sql.DB) (*sql.Stmt, error)
BuildFilterStatement(db *sql.DB) (*sql.Stmt, error)
}
/*
* General Helpers
*/
func buildQuestionArray(num int) string {
var qArray []string
for i := 0; i < num; i++ {
qArray[i] = "?"
}
qStr := strings.Join(qArray, ", ")
return qStr
}
func buildSetClause(cols *TableColumns) string {
outstr := ""
for _, col := range *cols {
outstr = fmt.Sprintf("%s%s=?,", outstr, col)
}
return outstr
}
func buildANDClause(cols *TableColumns) string {
var filterArray []string
for i, col := range *cols {
filterArray[i] = fmt.Sprintf("%s=?", col)
}
return "(" + strings.Join(filterArray, " AND ") + ")"
}
func buildOrderByClause(cols *TableColumns) string {
if cols != nil && len(*cols) > 0 {
joined := strings.Join(*cols, ", ")
return fmt.Sprintf(" ORDER BY (%s)", joined)
}
return ""
}
func buildLimitClause(limit int) string {
if limit > 0 {
return fmt.Sprintf(" LIMIT %d", limit)
}
return ""
}
/*
* Table Helpers
*/
func (t *Table) columnExists(col string) bool {
for _, tblCol := range t.Columns {
if col == tblCol {
return true
}
}
return false
}
func (t *Table) validColumns(cols *TableColumns) bool {
for _, col := range *cols {
if !t.columnExists(col) {
return false
}
}
return true
}
/*
* Create Columns
*/
func (t *Table) BuildCreateStatment(db *sql.DB) (*sql.Stmt, error) {
columnNames := strings.Join(t.Columns, ", ")
qStr := buildQuestionArray(len(t.Columns))
queryString := fmt.Sprintf("INSERT INTO %s (%s) VALUES (%s)",
t.Name, columnNames, qStr,
)
return db.Prepare(queryString)
}
/*
* Update Helpers
*/
func (t *Table) BuildUpdateStatement(
db *sql.DB,
filterCols *TableColumns,
updateCols *TableColumns,
) (*sql.Stmt, error) {
// TODO (tyrocca 2022-03-28): handle invalid column
t.validColumns(updateCols)
t.validColumns(filterCols)
// TODO (tyrocca 2022-03-28): Build update
updateString := buildSetClause(updateCols)
filterString := buildANDClause(filterCols)
queryString := fmt.Sprintf("UPDATE %s SET %s WHERE %s",
t.Name, updateString, filterString,
)
return db.Prepare(queryString)
}
/*
* Filter helpers
*/
func (t *Table) BuildFilterStatement(
db *sql.DB,
filterCols *TableColumns,
selectCols *TableColumns,
orderByCols *TableColumns,
limit int,
) (*sql.Stmt, error) {
// TODO (tyrocca 2022-03-28): error handle
t.validColumns(filterCols)
t.validColumns(selectCols)
t.validColumns(orderByCols)
selectString := strings.Join(*selectCols, ", ")
filterString := buildANDClause(filterCols)
// Additional params
orderByClause := buildOrderByClause(orderByCols)
limitClause := buildLimitClause(limit)
queryString := fmt.Sprintf("SELECT %s FROM %s WHERE %s%s%s",
selectString, t.Name, filterString, orderByClause, limitClause,
)
return db.Prepare(queryString)
}