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40 changes: 20 additions & 20 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ This Java library allows you to query Dgraph using SQL. You can think of it as a

To start using SQL, create a Dgraph client:

```
```java
ManagedChannel channel = ManagedChannelBuilder
.forAddress("localhost", 9080)
.usePlaintext().build();
Expand All @@ -18,7 +18,7 @@ DgraphClient dgraphClient = new DgraphClient(stub);

Translate SQL into native Dgraph queries:

```
```java
String sql = "SELECT r.resblock_name FROM (r:resblock) WHERE r.resblock_id = '1000010';";
SqlParser parser = SqlParser.getParser();
String graphql = parser.toGraphQL(sql);
Expand All @@ -27,13 +27,13 @@ System.out.println(graphql);

The output is:

```
```graphql
{ query(func:eq(resblock_id,"1000010"))@filter(type(resblock)){ resblock_name } }
```

Now you can run the Dgraph native query:

```
```java
dgraphClient.newReadOnlyTransaction().query(graphql);
```

Expand All @@ -52,7 +52,7 @@ Although Draph SQL follows the SQL terminology and conventions first, whenever p

GraphQL+- query example: Number of subway station nearby the resblock named "清秀阁".

```
```graphql
{
query(func: eq(resblock_name,"清秀阁"))@filter(type(resblock)){
count(r_subway_station)
Expand All @@ -62,7 +62,7 @@ GraphQL+- query example: Number of subway station nearby the resblock named "清

the Dgraph SQL equivalent:

```
```sql
SELECT count(r.r_subway_station)
FROM (r:resblock)-[:r_subway_station]->
WHERE r.resblock_name = '清秀阁';
Expand All @@ -74,7 +74,7 @@ The supported functions include min, max, sum and avg.

GraphQL+- query example: Find supermarkets named "日月超市" and the average green ratio of resblocks nearby them.

```
```graphql
{
C as var(func: allofterms(name,"日月超市"))@filter(type(supermarket)){
B as avg(val(A))
Expand All @@ -91,7 +91,7 @@ GraphQL+- query example: Find supermarkets named "日月超市" and the average

the Dgraph SQL equivalent:

```
```sql
SELECT s.name, sum(resblock.green_ratio)
FROM (s:supermarket)-[:~r_supermarket]->(resblock)
WHERE allofterms(s.name,'日月超市');
Expand All @@ -103,7 +103,7 @@ It must be specified that which node to limit. `first: N` retrieves the first `N

GraphQL+- query example: Find first three supermarkets that near by resblock named "清秀阁".

```
```graphql
{
query(func:eq(resblock_name,"清秀阁"))@filter(type(resblock)){
r_supermarket@filter(type(supermarket))(first:3){
Expand All @@ -115,7 +115,7 @@ GraphQL+- query example: Find first three supermarkets that near by resblock nam

the Dgraph SQL equivalent:

```
```sql
SELECT s.name
FROM (r:resblock)-[:r_supermarket]->(s:supermarket)
WHERE r.resblock_name = '清秀阁'
Expand All @@ -126,7 +126,7 @@ LIMIT s(first:3);

GraphQL+- query example:

```
```graphql
{
query(func:regexp(resblock_name,/秀园/), orderasc:resblock_name)@filter(type(resblock)){
resblock_name r_subway_station@filter(type(subway_station)){
Expand All @@ -138,7 +138,7 @@ LIMIT s(first:3);

the Dgraph SQL equivalent:

```shortestPath
```sql
SELECT r.resblock_name, s.name
FROM (r:resblock)-[:r_subway_station]->(s:subway_station)
WHERE regexp(r.resblock_name,'秀园')
Expand All @@ -153,7 +153,7 @@ inside the `select` clause.

GraphQL+- query example: Group resblocks by city and return the number of resblock in each city.

```
```graphql
{
var(func:type(resblock))@groupby(r_city){
A as count(uid)
Expand All @@ -166,7 +166,7 @@ GraphQL+- query example: Group resblocks by city and return the number of resblo

the Dgraph SQL equivalent:

```
```sql
SELECT count(r)
FROM (r:resblock)-[:r_city]->
GROUP BY r_city;
Expand All @@ -178,10 +178,10 @@ The shortest path between a source node and destination node can be found using

GraphQL+- query example:

```
```graphql
{
S as var(func: eq(name,"Alice"))@filter(type(person))
T as var(func: eq(name,"Bob"))@filter(tupe(person))
T as var(func: eq(name,"Bob"))@filter(type(person))
path as shortest(from: uid(S), to: uid(T), numpaths: 1) {
friend
}
Expand All @@ -193,7 +193,7 @@ GraphQL+- query example:

the Dgraph SQL equivalent:

```
```sql
SELECT shortest(property: name, numpaths: 1)
FROM (pm:person)-[:friend]->(rd:person)
WHERE pm.name = 'Alice' AND rd.name = 'Bob';
Expand All @@ -205,7 +205,7 @@ The maximum depth is specified by the `depth` parameter.

GraphQL+- query example:

```
```graphql
{
query(func:eq(resblock_name,"清秀阁"))@filter(type(resblock))@recurse(depth:3){
expand(_all_)
Expand All @@ -215,11 +215,11 @@ GraphQL+- query example:

the Dgraph SQL equivalent:

```
```sql
SELECT ndegree(depth: 3)
FROM (r:resblock)
WHERE r.resblock_name = '清秀阁';
```
### More about Dgraph SQL

There are more details about the SQL language in Dgraph SQL.md.
There are more details about the SQL language in Dgraph SQL.md.