db.sql.api.impl.tookit

类 SQLOptimizeUtils

java.lang.Object

db.sql.api.impl.tookit.SQLOptimizeUtils

public final class SQLOptimizeUtils
extends Object

优化sql工具 优化join 优化count的order by 和 left join

构造器概要

构造器

构造器和说明
SQLOptimizeUtils()

方法概要

限定符和类型	方法和说明
static StringBuilder	getCountSqlFromQuery(IQuery query, SqlBuilderContext context, OptimizeOptions optimizeOptions) 从一个query里获取count SQL
static StringBuilder	getOptimizedCountSql(IQuery query, SqlBuilderContext context, boolean optimizeOrderBy, boolean optimizeJoins) 获取优化后的count sql
static StringBuilder	getOptimizedCountSql(IQuery query, SqlBuilderContext context, OptimizeOptions optimizeOptions) 获取优化后的count sql
static StringBuilder	getOptimizedSql(IQuery query, SqlBuilderContext context, OptimizeOptions optimizeOptions) 获取优化后的查询 只优化left joins
static int	getStringBuilderCapacity(List<Cmd> cmds)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

SQLOptimizeUtils

public SQLOptimizeUtils()

方法详细资料

getStringBuilderCapacity

public static int getStringBuilderCapacity(List<Cmd> cmds)

getOptimizedSql

public static StringBuilder getOptimizedSql(IQuery query,
                                            SqlBuilderContext context,
                                            OptimizeOptions optimizeOptions)

获取优化后的查询 只优化left joins

参数:

query - 查询语句

context - 构建SQL上下文

optimizeOptions - 优化配置

返回:

getOptimizedCountSql

public static StringBuilder getOptimizedCountSql(IQuery query,
                                                 SqlBuilderContext context,
                                                 boolean optimizeOrderBy,
                                                 boolean optimizeJoins)

获取优化后的count sql

参数:

query - 查询语句

context - 构建SQL上下文

返回:

SQL StringBuilder

getCountSqlFromQuery

public static StringBuilder getCountSqlFromQuery(IQuery query,
                                                 SqlBuilderContext context,
                                                 OptimizeOptions optimizeOptions)

从一个query里获取count SQL

参数:

query - 查询语句

context - 构建SQL上下文

optimizeOptions - 优化配置

返回:

SQL StringBuilder

getOptimizedCountSql

public static StringBuilder getOptimizedCountSql(IQuery query,
                                                 SqlBuilderContext context,
                                                 OptimizeOptions optimizeOptions)

获取优化后的count sql

参数:

query - 查询语句

context - 构建SQL上下文

optimizeOptions - 优化配置

返回:

SQL StringBuilder