程序包 com.mysql.cj.xdevapi

类 DbDocImpl

java.lang.Object

java.util.AbstractMap<K,V>

java.util.TreeMap<String,JsonValue>

com.mysql.cj.xdevapi.DbDocImpl

所有已实现的接口:

DbDoc, JsonValue, Serializable, Cloneable, Map<String,JsonValue>, NavigableMap<String,JsonValue>, SortedMap<String,JsonValue>

public class DbDocImpl
extends TreeMap<String,JsonValue>
implements DbDoc

Represents a JSON object:

   {}
   or
   {key : value}
   or
   {key : value, key : value, ...}
 

key is a JSON string. value is any of JSON object, array, number, string, true, false, null. Example of valid JSON object:

 {
 "field1" : "value 1",
 "field2" : 1.234544E+26,
 "field3" : true,
 "field4" : false,
 "field5" : null,
 "field6" : {
            "inner field 1" : "inner value 1",
            "inner field 2" : 2,
            "inner field 3" : true,
            "inner field 4" : false,
            "inner field 5" : null,
            "inner field 6" : [],
            "inner field 7" : {}
            },
 "field7" : ["arr1", 3, true, false, null, [], {}]
 }
 

To create DbDoc from existing string representation you need to use JsonParser.parseDoc(java.io.StringReader) method:

 DbDoc doc = JsonParser.parseDoc(new StringReader("{\"key1\" : \"value1\"}"));
 

You can construct JSON document by DbDoc, JsonString, JsonNumber, JsonArray and JsonLiteral methods and get JSON string representation by using toString() method. For example, to get the document shown above:

 DbDoc doc = new DbDoc().add("field1", new JsonString().setValue("value 1")).add("field2", new JsonNumber().setValue("12345.44E22"))
         .add("field3", JsonLiteral.TRUE).add("field4", JsonLiteral.FALSE).add("field5", JsonLiteral.NULL)
         .add("field6",
                 new DbDoc().add("inner field 1", new JsonString().setValue("inner value 1")).add("inner field 2", new JsonNumber().setValue("2"))
                         .add("inner field 3", JsonLiteral.TRUE).add("inner field 4", JsonLiteral.FALSE).add("inner field 5", JsonLiteral.NULL)
                         .add("inner field 6", new JsonArray()).add("inner field 7", new DbDoc()))
         .add("field7", new JsonArray().addValue(new JsonString().setValue("arr1")).addValue(new JsonNumber().setValue("3")).addValue(JsonLiteral.TRUE)
                 .addValue(JsonLiteral.FALSE).addValue(JsonLiteral.NULL).addValue(new JsonArray()).addValue(new DbDoc()));
 
 doc.toString();
 

另请参阅:

序列化表格

嵌套类概要

从类继承的嵌套类/接口 java.util.AbstractMap

AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

从接口继承的嵌套类/接口 java.util.Map

Map.Entry<K extends Object,V extends Object>

构造器概要

构造器

构造器	说明
DbDocImpl()

方法概要

修饰符和类型	方法	说明
DbDoc	add(String key, JsonValue val)	Add JsonValue to the top-level document hierarchy.
String	toFormattedString()	Get a human readable "pretty" JSON string.
String	toString()

从类继承的方法 java.util.TreeMap

ceilingEntry, ceilingKey, clear, clone, comparator, containsKey, containsValue, descendingKeySet, descendingMap, entrySet, firstEntry, firstKey, floorEntry, floorKey, forEach, get, headMap, headMap, higherEntry, higherKey, keySet, lastEntry, lastKey, lowerEntry, lowerKey, navigableKeySet, pollFirstEntry, pollLastEntry, put, putAll, remove, replace, replace, replaceAll, size, subMap, subMap, tailMap, tailMap, values

从类继承的方法 java.util.AbstractMap

equals, hashCode, isEmpty

从类继承的方法 java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

从接口继承的方法 java.util.Map

clear, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, equals, forEach, get, getOrDefault, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size

构造器详细资料

DbDocImpl

public DbDocImpl()

方法详细资料

toString

public String toString()

覆盖:

toString 在类中 AbstractMap<String,JsonValue>

toFormattedString

public String toFormattedString()

从接口复制的说明: JsonValue

Get a human readable "pretty" JSON string.

指定者:

toFormattedString 在接口中 JsonValue

返回:

human readable "pretty" JSON string

add

public DbDoc add(String key,
                 JsonValue val)

从接口复制的说明: DbDoc

Add JsonValue to the top-level document hierarchy.

指定者:

add 在接口中 DbDoc

参数:

key - field key

val - field value

返回:

DbDoc