decrease memory used

src/main/java/com/alibaba/druid/proxy/jdbc/JdbcParameterImpl.java

@@ -0,0 +1,56 @@
+package com.alibaba.druid.proxy.jdbc;
+
+import java.util.Calendar;
+
+public class JdbcParameterImpl implements JdbcParameter {
+
+    private final int      sqlType;
+    private final Object   value;
+    private final long     length;
+    private final Calendar calendar;
+    private final int      scaleOrLength;
+
+    public JdbcParameterImpl(int sqlType, Object value, long length, Calendar calendar, int scaleOrLength){
+        this.sqlType = sqlType;
+        this.value = value;
+        this.length = length;
+        this.calendar = calendar;
+        this.scaleOrLength = scaleOrLength;
+    }
+
+    public JdbcParameterImpl(int sqlType, Object value, long length, Calendar calendar){
+        this(sqlType, value, -1, null, -1);
+    }
+
+    public JdbcParameterImpl(int sqlType, Object value){
+        this(sqlType, value, -1, null);
+    }
+
+    public JdbcParameterImpl(int sqlType, Object value, long length){
+        this(sqlType, value, length, null);
+    }
+
+    public JdbcParameterImpl(int sqlType, Object value, Calendar calendar){
+        this(sqlType, value, -1, calendar);
+    }
+
+    public int getScaleOrLength() {
+        return scaleOrLength;
+    }
+
+    public Object getValue() {
+        return value;
+    }
+
+    public long getLength() {
+        return length;
+    }
+
+    public Calendar getCalendar() {
+        return calendar;
+    }
+
+    public int getSqlType() {
+        return sqlType;
+    }
+}