Add dbtools-query dependency to your "dependencies" section of the build.gradle file. (latest version is found in Maven Central Repo: http://search.maven.org/#search%7Cga%7C1%7Ca%3A%22dbtools-query%22)
dependencies {
compile 'org.dbtools:dbtools-android:<latest version>'
}
Writing SQL in Java can be painful because you spend a lot of time placing " and + between statements and variables (especially if you have your columns mapped to static variables). Example:
String query = "SELECT " + MyTable.C_NAME + ", " + MyTable.C_PHONE + ", " +
MyTable.C_ADDRESS + " FROM " + MyTable.TABLE_NAME;
If you forget to put in a comma or enough spaces, then you will not know there is an issue until run-time. In order to find the problem, you will have to log the SQL text and try to hunt for the minor error.
DBTools Query (for the same query above):
String query = new SQLQueryBuilder()
.field(MyTable.C_NAME)
.field(MyTable.C_PHONE)
.field(MyTable.C_ADDRESS)
.table(MyTable.TABLE_NAME)
.buildQuery();
-
Select ALL
// "SELECT * FROM Person" String query = new SQLQueryBuilder() .table("Person") .buildQuery(); -
Fields
// "SELECT LastName, FirstName FROM Person" String query = new SQLQueryBuilder() .field("LastName") .field("FirstName") .table("Person") .buildQuery(); // "SELECT LastName, FirstName, Age FROM Person" String query = new SQLQueryBuilder() .fields("LastName", "FirstName", "Age") .table("Person") .buildQuery(); -
Distinct
// "SELECT DISTINCT LastName FROM Person" String query = new SQLQueryBuilder() .distinct(true) .field("LastName") .table("Person") .buildQuery(); -
Order By
// "SELECT * FROM Car ORDER BY Name" String query = new SQLQueryBuilder() .table("Car") .orderBy("Name") .buildQuery(); -
Group By
// "SELECT Name, Color FROM Car GROUP BY Name" String query = new SQLQueryBuilder() .table("Car") .field("Name") .field("Color") .groupBy("Name") .buildQuery(); -
Filter
// "SELECT * FROM Car WHERE Car.ID = ? // AND Car.NAME = 'Ford' AND Car.WHEELS > 4 AND Car.IS_COOL = 1" String query = new SQLQueryBuilder() .table("Car") .filter("Car.ID", "?") .filter("Car.NAME", "Ford") .filter("Car.WHEELS", CompareType.GREATERTHAN, 4) .filter("Car.IS_COOL", true) .buildQuery(); -
Filter Or
// "SELECT * FROM Car WHERE Car.IS_COOL = 1 // AND (Car.ID = ? OR Car.NAME = 'Ford' OR Car.NAME = 'Chevy') // AND (Car.WHEELS > 4 OR Car.WHEELS <= 2)" String query =new SQLQueryBuilder() .table("Car") .filter("Car.IS_COOL", true) .filter(CompareFilter.create("Car.ID", "?").or("Car.NAME", "'Ford'").or("Car.NAME", "'Chevy'")) .filter(CompareFilter.create("Car.WHEELS", CompareType.GREATERTHAN, 4).or("Car.WHEELS", CompareType.LESSTHAN_EQUAL, 2)) .buildQuery(); -
Multiple Tables
// "SELECT Person.*, s.name AS stat_name, c.name AS cat_name // FROM Person p, Status s, Category c WHERE p.ID = 5" String query = new SQLQueryBuilder() .distinct(true) .table("Person", "p") .table("Status", "s") .table("Category", "c") .field("Person.*") .field("s.name", "stat_name") .field("c.name", "cat_name") .filter("p.ID", 5) .buildQuery(); -
Join
// "SELECT Name FROM Car // JOIN Colors ON Color.ID = Car.COLOR_ID ORDER BY Color.Name" String query = new SQLQueryBuilder() .table("Car") .join("Colors", "Color.ID", "Car.COLOR_ID") .field("Name") .orderBy("Color.Name") .buildQuery(); -
Multiple Joins
// "SELECT Name FROM Car // JOIN Color ON Color.ID = Car.COLOR_ID // LEFT JOIN Owner ON Owner.ID = Car.OWNER_ID // WHERE Car.ID = 5 ORDER BY Color.Name" String query = new SQLQueryBuilder() .table("Car") .join("Color", "Color.ID", "Car.COLOR_ID") .join(QueryJoinType.LEFT_JOIN, "Owner", "Owner.ID", "Car.OWNER_ID") .field("Name") .filter("Car.ID", 5) .orderBy("Color.Name") .buildQuery(); -
Joins with AND
// "SELECT Name FROM Car JOIN Colors ON Color.ID = Car.COLOR_ID // AND Color.COOL = 1 JOIN Make ON Car.MAKE_ID = Make.ID ORDER BY Color.Name" String query = new SQLQueryBuilder() .table("Car") .join("Colors", CompareFilter.create("Color.ID", "Car.COLOR_ID"), CompareFilter.create("Color.COOL", "1")) .join("Make", "Car.MAKE_ID", "Make.ID") .field("Name") .orderBy("Color.Name") .buildQuery(); -
Sub-Select
// "SELECT * FROM Family WHERE HeadPerson IN (SELECT id FROM Person)" SQLQueryBuilder subSql = new SQLQueryBuilder(); subSql.field("id"); subSql.table("Person"); SQLQueryBuilder sql = new SQLQueryBuilder(); sql.table("Family"); sql.filter("HeadPerson", CompareType.IN, subSql); -
Union
// "(SELECT id FROM Person UNION SELECT id FROM Family)" SQLQueryBuilder sql1 = new SQLQueryBuilder(); sql1.field("id"); sql1.table("Person"); SQLQueryBuilder sql2 = new SQLQueryBuilder(); sql2.field("id"); sql2.table("Family"); String query = SQLQueryBuilder.union(sql1, sql2); // or use unionAll(...) -
Complex Union
// "SELECT * FROM (SELECT id FROM Person UNION SELECT id FROM Family)" SQLQueryBuilder sql1 = new SQLQueryBuilder(); sql1.field("id"); sql1.table("Person"); SQLQueryBuilder sql2 = new SQLQueryBuilder(); sql2.field("id"); sql2.table("Family"); SQLQueryBuilder union = new SQLQueryBuilder(); union.table(SQLQueryBuilder.union(sql1, sql2)); -
Apply one query to another Query
// Final Query = "SELECT * FROM Car WHERE Car.ID = ? // AND Car.NAME = 'Ford' AND Car.WHEELS > 4 AND Car.IS_COOL = 1" // // Query1 = "SELECT * FROM Car WHERE Car.ID = ?" // Query2 = Additional filters // QUERY 1 SQLQueryBuilder sql1 = new SQLQueryBuilder(); sql1.table("Car"); sql1.filter("Car.ID", "?"); // QUERY 2 SQLQueryBuilder sql2 = new SQLQueryBuilder(); sql2.filter("Car.NAME", "Ford"); sql2.filter("Car.WHEELS", CompareType.GREATERTHAN, 4); sql2.filter("Car.IS_COOL", true); sql1.apply(sql2);
Copyright 2015 Jeff Campbell
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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