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gdb_model_join.go
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gdb_model_join.go
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// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
package gdb
import (
"fmt"
"github.com/gogf/gf/v2/text/gstr"
)
// LeftJoin does "LEFT JOIN ... ON ..." statement on the model.
// The parameter `table` can be joined table and its joined condition,
// and also with its alias name.
//
// Eg:
// Model("user").LeftJoin("user_detail", "user_detail.uid=user.uid")
// Model("user", "u").LeftJoin("user_detail", "ud", "ud.uid=u.uid")
// Model("user", "u").LeftJoin("SELECT xxx FROM xxx","a", "a.uid=u.uid").
func (m *Model) LeftJoin(tableOrSubQueryAndJoinConditions ...string) *Model {
return m.doJoin(joinOperatorLeft, tableOrSubQueryAndJoinConditions...)
}
// RightJoin does "RIGHT JOIN ... ON ..." statement on the model.
// The parameter `table` can be joined table and its joined condition,
// and also with its alias name.
//
// Eg:
// Model("user").RightJoin("user_detail", "user_detail.uid=user.uid")
// Model("user", "u").RightJoin("user_detail", "ud", "ud.uid=u.uid")
// Model("user", "u").RightJoin("SELECT xxx FROM xxx","a", "a.uid=u.uid").
func (m *Model) RightJoin(tableOrSubQueryAndJoinConditions ...string) *Model {
return m.doJoin(joinOperatorRight, tableOrSubQueryAndJoinConditions...)
}
// InnerJoin does "INNER JOIN ... ON ..." statement on the model.
// The parameter `table` can be joined table and its joined condition,
// and also with its alias name。
//
// Eg:
// Model("user").InnerJoin("user_detail", "user_detail.uid=user.uid")
// Model("user", "u").InnerJoin("user_detail", "ud", "ud.uid=u.uid")
// Model("user", "u").InnerJoin("SELECT xxx FROM xxx","a", "a.uid=u.uid").
func (m *Model) InnerJoin(tableOrSubQueryAndJoinConditions ...string) *Model {
return m.doJoin(joinOperatorInner, tableOrSubQueryAndJoinConditions...)
}
// LeftJoinOnField performs as LeftJoin, but it joins both tables with the `same field name`.
//
// Eg:
// Model("order").LeftJoinOnField("user", "user_id")
// Model("order").LeftJoinOnField("product", "product_id").
func (m *Model) LeftJoinOnField(table, field string) *Model {
return m.doJoin(joinOperatorLeft, table, fmt.Sprintf(
`%s.%s=%s.%s`,
m.tablesInit,
m.db.GetCore().QuoteWord(field),
m.db.GetCore().QuoteWord(table),
m.db.GetCore().QuoteWord(field),
))
}
// RightJoinOnField performs as RightJoin, but it joins both tables with the `same field name`.
//
// Eg:
// Model("order").InnerJoinOnField("user", "user_id")
// Model("order").InnerJoinOnField("product", "product_id").
func (m *Model) RightJoinOnField(table, field string) *Model {
return m.doJoin(joinOperatorRight, table, fmt.Sprintf(
`%s.%s=%s.%s`,
m.tablesInit,
m.db.GetCore().QuoteWord(field),
m.db.GetCore().QuoteWord(table),
m.db.GetCore().QuoteWord(field),
))
}
// InnerJoinOnField performs as InnerJoin, but it joins both tables with the `same field name`.
//
// Eg:
// Model("order").InnerJoinOnField("user", "user_id")
// Model("order").InnerJoinOnField("product", "product_id").
func (m *Model) InnerJoinOnField(table, field string) *Model {
return m.doJoin(joinOperatorInner, table, fmt.Sprintf(
`%s.%s=%s.%s`,
m.tablesInit,
m.db.GetCore().QuoteWord(field),
m.db.GetCore().QuoteWord(table),
m.db.GetCore().QuoteWord(field),
))
}
// LeftJoinOnFields performs as LeftJoin. It specifies different fields and comparison operator.
//
// Eg:
// Model("user").LeftJoinOnFields("order", "id", "=", "user_id")
// Model("user").LeftJoinOnFields("order", "id", ">", "user_id")
// Model("user").LeftJoinOnFields("order", "id", "<", "user_id")
func (m *Model) LeftJoinOnFields(table, firstField, operator, secondField string) *Model {
return m.doJoin(joinOperatorLeft, table, fmt.Sprintf(
`%s.%s %s %s.%s`,
m.tablesInit,
m.db.GetCore().QuoteWord(firstField),
operator,
m.db.GetCore().QuoteWord(table),
m.db.GetCore().QuoteWord(secondField),
))
}
// RightJoinOnFields performs as RightJoin. It specifies different fields and comparison operator.
//
// Eg:
// Model("user").RightJoinOnFields("order", "id", "=", "user_id")
// Model("user").RightJoinOnFields("order", "id", ">", "user_id")
// Model("user").RightJoinOnFields("order", "id", "<", "user_id")
func (m *Model) RightJoinOnFields(table, firstField, operator, secondField string) *Model {
return m.doJoin(joinOperatorRight, table, fmt.Sprintf(
`%s.%s %s %s.%s`,
m.tablesInit,
m.db.GetCore().QuoteWord(firstField),
operator,
m.db.GetCore().QuoteWord(table),
m.db.GetCore().QuoteWord(secondField),
))
}
// InnerJoinOnFields performs as InnerJoin. It specifies different fields and comparison operator.
//
// Eg:
// Model("user").InnerJoinOnFields("order", "id", "=", "user_id")
// Model("user").InnerJoinOnFields("order", "id", ">", "user_id")
// Model("user").InnerJoinOnFields("order", "id", "<", "user_id")
func (m *Model) InnerJoinOnFields(table, firstField, operator, secondField string) *Model {
return m.doJoin(joinOperatorInner, table, fmt.Sprintf(
`%s.%s %s %s.%s`,
m.tablesInit,
m.db.GetCore().QuoteWord(firstField),
operator,
m.db.GetCore().QuoteWord(table),
m.db.GetCore().QuoteWord(secondField),
))
}
// doJoin does "LEFT/RIGHT/INNER JOIN ... ON ..." statement on the model.
// The parameter `tableOrSubQueryAndJoinConditions` can be joined table and its joined condition,
// and also with its alias name.
//
// Eg:
// Model("user").InnerJoin("user_detail", "user_detail.uid=user.uid")
// Model("user", "u").InnerJoin("user_detail", "ud", "ud.uid=u.uid")
// Model("user", "u").InnerJoin("user_detail", "ud", "ud.uid>u.uid")
// Model("user", "u").InnerJoin("SELECT xxx FROM xxx","a", "a.uid=u.uid")
// Related issues:
// https://github.com/gogf/gf/issues/1024
func (m *Model) doJoin(operator joinOperator, tableOrSubQueryAndJoinConditions ...string) *Model {
var (
model = m.getModel()
joinStr = ""
table string
alias string
)
// Check the first parameter table or sub-query.
if len(tableOrSubQueryAndJoinConditions) > 0 {
if isSubQuery(tableOrSubQueryAndJoinConditions[0]) {
joinStr = gstr.Trim(tableOrSubQueryAndJoinConditions[0])
if joinStr[0] != '(' {
joinStr = "(" + joinStr + ")"
}
} else {
table = tableOrSubQueryAndJoinConditions[0]
joinStr = m.db.GetCore().QuotePrefixTableName(table)
}
}
// Generate join condition statement string.
conditionLength := len(tableOrSubQueryAndJoinConditions)
switch {
case conditionLength > 2:
alias = tableOrSubQueryAndJoinConditions[1]
model.tables += fmt.Sprintf(
" %s JOIN %s AS %s ON (%s)",
operator, joinStr,
m.db.GetCore().QuoteWord(alias),
tableOrSubQueryAndJoinConditions[2],
)
m.tableAliasMap[alias] = table
case conditionLength == 2:
model.tables += fmt.Sprintf(
" %s JOIN %s ON (%s)",
operator, joinStr, tableOrSubQueryAndJoinConditions[1],
)
case conditionLength == 1:
model.tables += fmt.Sprintf(
" %s JOIN %s", operator, joinStr,
)
}
return model
}
// getTableNameByPrefixOrAlias checks and returns the table name if `prefixOrAlias` is an alias of a table,
// it or else returns the `prefixOrAlias` directly.
func (m *Model) getTableNameByPrefixOrAlias(prefixOrAlias string) string {
value, ok := m.tableAliasMap[prefixOrAlias]
if ok {
return value
}
return prefixOrAlias
}
// isSubQuery checks and returns whether given string a sub-query sql string.
func isSubQuery(s string) bool {
s = gstr.TrimLeft(s, "()")
if p := gstr.Pos(s, " "); p != -1 {
if gstr.Equal(s[:p], "select") {
return true
}
}
return false
}