LikeSql——让你更优雅地写SQL_JAVA_编程开发_程序员俱乐部

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LikeSql是什么

LikeSql是我写一个开源的小框架（http://code.google.com/p/likesql/），目标是提供一个更优雅地处理SQL的一个方案，希望能够替代PreparedStatement和直接拼接SQL。虽然现在还有没有正式的release版本，我还在为此努力。

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设计宗旨：

• 专注于优雅地编写SQL和易读性
• 保持细小和灵活

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一些代码示例：

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public void testAtStyleExpression(){
		LikeSql sql=DML.select("id,name")
		               .from("user")
		               .where(AtExp.at("(name =@name or id=@id) and gender=@gender")
		            		                       .set("id", 1)
		            		                       .set("name", "John")
		            		                       .set("gender", "M"));
		
		String eSql="SELECT id,name FROM user WHERE (name ='John' or id=1) and gender='M'";
		String eTpl="SELECT id,name FROM user WHERE (name =? or id=?) and gender=?";
		
		assertEquals(eSql,sql.toString());
		assertEquals(eTpl,sql.toTemplate());
	}

public void testInExpression(){
		LikeSql sSql=DML.select("id,name")
		    .from("user")
		    .where(QuestExp.qt("id in (?)").set(1,ArrayExp.array(new int[]{1,3,6})));
		
		String eSql="SELECT id,name FROM user WHERE id in (1,3,6)";
		String eTpl="SELECT id,name FROM user WHERE id in (?,?,?)";
		
		assertEquals(eSql,sSql.toString());
		assertEquals(eTpl,sSql.toTemplate());
	}

public void testSimpleSql(){
		String eSql="INSERT INTO users (no,id,name,gender,height) VALUES(1,15666662656565,'johny',null,195.36)";
		String eTpl="INSERT INTO users (no,id,name,gender,height) VALUES(?,?,?,?,?)";
		
		LikeSql iSql=DML.insertInto("users")
		    .value("no", 1)
		    .value("id", new BigInteger("15666662656565"))
		    .value("name","johny")
		    .value("gender",null)
		    .value("height", 195.36);
		
		assertEquals(eSql,iSql.toString());
		assertEquals(eTpl,iSql.toTemplate());
	}

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LikeSql sql=DML.selectAll()
				               .from("user")
				               .where(QuestExp.qt("id=? AND gender=?")
						                      .set(1, 1)
						                      .set(2, 'M'));
				PreparedStatement stmt=sql.toPreStatement(con);
				System.out.println("Template:"+sql.toTemplate());
				System.out.println("SQL:"+sql.toString());
				ResultSet rs=stmt.executeQuery();
				while(rs.next()){
					System.out.println(rs.getString("name"));
				}

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LikeSql不是什么

• LikeSql不是ORM框架
• LikeSql不是重复发明iBatis，Hibernate

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为什么会有LikeSql