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Parameter binding in InfluxQL (influxdata/influxdb-java#274) #429
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2ea9ec6
First simple implementation of "prepared statements"
hampelratte 658fa1d
Added another test for BoundParameterQuery
hampelratte d71f316
Implemented Builder mechanism for BoundParameterQuery
hampelratte 929cfde
Removed unnecessary method
hampelratte 7eb0b5a
Added test for the different parameter types
hampelratte f03fa37
Added equals and hashcode
hampelratte 966d781
Code cleanup
hampelratte be08bcd
Added test for BoundParameterQuery
hampelratte 58cd9eb
Improved test coverage for BoundParameterQuery
hampelratte f761e61
Removed unnecessary placeholder checks
hampelratte 2fc928e
Added paragraph for parameter binding in queries in README
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101 changes: 101 additions & 0 deletions
101
src/main/java/org/influxdb/dto/BoundParameterQuery.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package org.influxdb.dto; | ||
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| import com.squareup.moshi.JsonWriter; | ||
| import java.io.IOException; | ||
| import java.nio.charset.Charset; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.Map.Entry; | ||
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| import org.influxdb.InfluxDBIOException; | ||
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| import okio.Buffer; | ||
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| public final class BoundParameterQuery extends Query { | ||
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| private final Map<String, Object> params = new HashMap<>(); | ||
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| private BoundParameterQuery(final String command, final String database) { | ||
| super(command, database, true); | ||
| } | ||
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| public String getParameterJsonWithUrlEncoded() { | ||
| try { | ||
| String jsonParameterObject = createJsonObject(params); | ||
| String urlEncodedJsonParameterObject = encode(jsonParameterObject); | ||
| return urlEncodedJsonParameterObject; | ||
| } catch (IOException e) { | ||
| throw new InfluxDBIOException(e); | ||
| } | ||
| } | ||
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| private String createJsonObject(final Map<String, Object> parameterMap) throws IOException { | ||
| Buffer b = new Buffer(); | ||
| JsonWriter writer = JsonWriter.of(b); | ||
| writer.beginObject(); | ||
| for (Entry<String, Object> pair : parameterMap.entrySet()) { | ||
| String name = pair.getKey(); | ||
| Object value = pair.getValue(); | ||
| if (value instanceof Number) { | ||
| Number number = (Number) value; | ||
| writer.name(name).value(number); | ||
| } else if (value instanceof String) { | ||
| writer.name(name).value((String) value); | ||
| } else if (value instanceof Boolean) { | ||
| writer.name(name).value((Boolean) value); | ||
| } else { | ||
| writer.name(name).value(String.valueOf(value)); | ||
| } | ||
| } | ||
| writer.endObject(); | ||
| return b.readString(Charset.forName("utf-8")); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| final int prime = 31; | ||
| int result = super.hashCode(); | ||
| result = prime * result + params.hashCode(); | ||
| return result; | ||
| } | ||
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| @Override | ||
| public boolean equals(final Object obj) { | ||
| if (this == obj) { | ||
| return true; | ||
| } | ||
| if (!super.equals(obj)) { | ||
| return false; | ||
| } | ||
| BoundParameterQuery other = (BoundParameterQuery) obj; | ||
| if (!params.equals(other.params)) { | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
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| public static class QueryBuilder { | ||
| private BoundParameterQuery query; | ||
| private String influxQL; | ||
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| public static QueryBuilder newQuery(final String influxQL) { | ||
| QueryBuilder instance = new QueryBuilder(); | ||
| instance.influxQL = influxQL; | ||
| return instance; | ||
| } | ||
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| public QueryBuilder forDatabase(final String database) { | ||
| query = new BoundParameterQuery(influxQL, database); | ||
| return this; | ||
| } | ||
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| public QueryBuilder bind(final String placeholder, final Object value) { | ||
| query.params.put(placeholder, value); | ||
| return this; | ||
| } | ||
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| public BoundParameterQuery create() { | ||
| return query; | ||
| } | ||
| } | ||
| } | ||
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The moshi library has a specific behavior when deserializing numbers: #153 (comment)
I hope casting to
Numberis enough to keep the data type on the JSON object being created here.There was a problem hiding this comment.
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I had a look at the moshi code and tested it. This works as intended.