rsql_builder 0.1.3

sql builder utils
Documentation 
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# rsql_builder

a dynamic build sql utils;

## start

dependency

```
[dependencies]
rsql_builder="0.1"

```

## api

### new builer

build rule

|builder|join str| prefix| subfix |  trim|
|-|-|-|-|-|
|B::new() | " "| [empty]| [empty] | [empty] |
|B::new_where() | " and " | "where "  | "" | "and" |
|B::new_comma() | "," | [empty]|[empty]|","|
|B::new_comma_paren() | "," | "("|")"|","|
|B::new_or() | " or " | "("|")"|"or"|
|B::new_and() | " and " | "("|")"|"and"|
|B::new_paren() | " " | "("|")"|[empty]|

### simple push

+ builder.push(sql,arg)
+ builder.push_fn(f:Fn()->builder)
+ builder.push_sql(sql)
+ builder.push_arg(arg)

### push sub builder

+ builder.push_build(&mut sub_builder)

### builder sql method

|method|sql code|
|-|-|
|eq| f=?|
|ne|f<>?|
|lt|f<?|
|le|f<=?|
|gt|f>?|
|ge|f>=?|
|r#in| f in(?,?,?)|
|not_in| f not in(?,?,?)|

### prepare

B::prepare(&mut Builder) -> (String,Vec<serde_json::Value>) 
return (sql,args) 

## examples 

foo_dao example:

```rust
use rsql_builder::B;

/* 
example table[sqlite]: 
create table if not exists tb_foo (
    id integer primary key autoincrement,
    name varchar(255),
    email varchar(255),
    age integer 
);
*/

#[derive(Debug,Default)]
pub struct Foo{
    pub id:Option<i64>,
    pub name:Option<String>,
    pub email:Option<String>,
    pub age:Option<i64>,
}

#[derive(Debug,Default)]
pub struct FooParam{
    pub id:Option<i64>,
    pub id_list:Option<Vec<i64>>,
    pub name:Option<String>,
    pub name_list:Option<Vec<String>>,
    pub name_or_email:Option<String>,
    pub age:Option<i64>,
    pub age_begin:Option<i64>,
    pub age_end:Option<i64>,
}

struct FooInnerDao {
    //connection
}

impl FooInnerDao {

    fn conditions(&self,param:&FooParam) -> B {
        let mut whr = B::new_where();
        if let Some(id)=&param.id {
            whr.eq("id",id);
        }
        if let Some(id_list)=&param.id_list {
            whr.r#in("id", id_list);
        }
        if let Some(name)=&param.name{
            whr.eq("name", name);
        }
        if let Some(name_list)=&param.name_list{
            whr.r#in("name", name_list);
        }
        if let Some(name_or_email) = &param.name_or_email {
            whr.wrap(B::new_or()
                .eq("name",name_or_email)
                .eq("email",name_or_email)
            );
        }
        if let Some(age) = &param.age {
            whr.eq("age",age);
        }
        if let Some(age_begin) = &param.age_begin {
            whr.ge("age",age_begin);
        }
        if let Some(age_end) = &param.age_end {
            whr.lt("age",age_end);
        }
        whr
    }

    pub fn query_prepare(&self,param:&FooParam) -> (String,Vec<serde_json::Value>) {
        B::prepare(
     B::new_sql("select id,name,email,age from tb_foo")
            .push_build(&mut self.conditions(param))
            .push_fn(||{
                let mut b= B::new();
                if let Some(limit) = &param.limit{
                    b.push("limit ?", limit);
                }
                if let Some(offset ) = &param.offset{
                    b.push("offset ?", offset);
                }
                b
            })
        )
    }

    pub fn insert_prepare(&self,foo:&Foo) -> (String,Vec<serde_json::Value>) {
        let mut field_builder=B::new_comma_paren();
        let mut value_builder=B::new_comma_paren();
        if let Some(id) = &foo.id {
            field_builder.push_sql("id");
            value_builder.push("?",id);
        }
        if let Some(name) = &foo.name {
            field_builder.push_sql("name");
            value_builder.push("?",name);
        }
        if let Some(email) = &foo.email {
            field_builder.push_sql("email");
            value_builder.push("?",email);
        }
        if let Some(age) = &foo.age {
            field_builder.push_sql("age");
            value_builder.push("?",age);
        }
        B::prepare(
     B::new_sql("insert into tb_foo")
            .push_build(&mut field_builder)
            .push_sql("values")
            .push_build(&mut value_builder)
        )
    }

    pub fn update_prepare(&self,foo:&Foo) -> (String,Vec<serde_json::Value>) {
        let mut set_builder=B::new_comma();
        if let Some(name) = &foo.name {
            set_builder.push("name=?",name);
        }
        if let Some(email) = &foo.email {
            set_builder.push("email=?",email);
        }
        if let Some(age) = &foo.age {
            set_builder.push("age=?",age);
        }
        let mut whr = B::new_where();
        if let Some(id)=&foo.id {
            whr.eq("id",id);
        }
        if whr.is_empty() {
            panic!("update conditions is empty");
        }
        B::prepare(
     B::new_sql("update tb_foo set ")
            .push_build(&mut set_builder)
            .push_build(&mut whr)
        )
    }

    pub fn delete_prepare(&self,param:&FooParam) -> (String,Vec<serde_json::Value>) {
        B::prepare(
     B::new_sql("delete from tb_foo")
            .push_build(&mut self.conditions(param))
        )
    }

}

fn query_exp(){
    let foo_dao = FooInnerDao{};
    let mut param = FooParam::default();
    let (sql,args)= foo_dao.query_prepare(&param);
    println!("query 01:\n\t'{}'\n\t{:?}",&sql,&args); 

    let mut param = FooParam::default();
    param.id=Some(1);
    let (sql,args)= foo_dao.query_prepare(&param);
    println!("query 02:\n\t'{}'\n\t{:?}",&sql,&args); 

    let mut param = FooParam::default();
    param.id_list = Some(vec![1,2,3]);
    let (sql,args)= foo_dao.query_prepare(&param);
    println!("query 03:\n\t'{}'\n\t{:?}",&sql,&args); 

    let mut param = FooParam::default();
    param.id_list = Some(vec![1,2,3]);
    param.name_list=Some(vec!["foo".to_owned(),"boo".to_owned()]);
    param.name_or_email=Some("foo@foo.com".to_owned());
    param.age=Some(18);
    param.age_begin=Some(16);
    param.age_end=Some(24);
    let (sql,args)= foo_dao.query_prepare(&param);
    println!("query 04:\n\t'{}'\n\t{:?}",&sql,&args); 
}

fn insert_exp(){
    let foo_dao = FooInnerDao{};
    let mut foo = Foo::default();
    foo.id=Some(1);
    foo.name = Some("foo".to_owned());
    let (sql,args)= foo_dao.insert_prepare(&foo);
    println!("insert 01:\n\t'{}'\n\t{:?}",&sql,&args); 

    let mut foo = Foo::default();
    foo.name = Some("foo".to_owned());
    foo.email= Some("foo@foo.com".to_owned());
    let (sql,args)= foo_dao.insert_prepare(&foo);
    println!("insert 02:\n\t'{}'\n\t{:?}",&sql,&args); 

    let mut foo = Foo::default();
    foo.id=Some(3);
    foo.name = Some("foo".to_owned());
    foo.email= Some("foo@foo.com".to_owned());
    foo.age = Some(16);
    let (sql,args)= foo_dao.insert_prepare(&foo);
    println!("insert 03:\n\t'{}'\n\t{:?}",&sql,&args); 
}

fn update_exp(){
    let foo_dao = FooInnerDao{};
    let mut foo = Foo::default();
    foo.id=Some(1);
    foo.name = Some("foo".to_owned());
    let (sql,args)= foo_dao.update_prepare(&foo);
    println!("update 01:\n\t'{}'\n\t{:?}",&sql,&args); 

    let mut foo = Foo::default();
    foo.id=Some(3);
    foo.name = Some("foo".to_owned());
    foo.email= Some("foo@foo.com".to_owned());
    foo.age = Some(16);
    let (sql,args)= foo_dao.update_prepare(&foo);
    println!("update 02:\n\t'{}'\n\t{:?}",&sql,&args); 
}

fn delete_exp(){
    let foo_dao = FooInnerDao{};
    let mut param = FooParam::default();
    param.id_list = Some(vec![1,2,3]);
    param.name_list=Some(vec!["foo".to_owned(),"boo".to_owned()]);
    param.name_or_email=Some("foo@foo.com".to_owned());
    param.age=Some(18);
    param.age_begin=Some(16);
    param.age_end=Some(24);
    let (sql,args)= foo_dao.delete_prepare(&param);
    println!("delete 01:\n\t'{}'\n\t{:?}",&sql,&args); 
}


fn main(){
    query_exp();
    insert_exp();
    update_exp();
    delete_exp();
}
```

output: 

```
query 01:
        'select id,name,email,age from tb_foo'
        []
query 02:
        'select id,name,email,age from tb_foo where id=?'
        [Number(1)]
query 03:
        'select id,name,email,age from tb_foo where id in (? , ? , ?)'
        [Number(1), Number(2), Number(3)]
query 04:
        'select id,name,email,age from tb_foo where id in (? , ? , ?) and name in (? , ?) and (name=? or email=?) and age=? and age>=? and age<?'
        [Number(1), Number(2), Number(3), String("foo"), String("boo"), String("foo@foo.com"), String("foo@foo.com"), Number(18), Number(16), Number(24)]
insert 01:
        'insert into tb_foo (id , name) values (? , ?)'
        [Number(1), String("foo")]
insert 02:
        'insert into tb_foo (name , email) values (? , ?)'
        [String("foo"), String("foo@foo.com")]
insert 03:
        'insert into tb_foo (id , name , email , age) values (? , ? , ? , ?)'
        [Number(3), String("foo"), String("foo@foo.com"), Number(16)]
update 01:
        'update tb_foo set   name=?  where id=?'
        [String("foo"), Number(1)]
update 02:
        'update tb_foo set   name=? , email=? , age=?  where id=?'
        [String("foo"), String("foo@foo.com"), Number(16), Number(3)]
delete 04:
        'delete from tb_foo where id in (? , ? , ?) and name in (? , ?) and (name=? or email=?) and age=? and age>=? and age<?'
        [Number(1), Number(2), Number(3), String("foo"), String("boo"), String("foo@foo.com"), String("foo@foo.com"), Number(18), Number(16), Number(24)]
```