add mybatis GsonHandler

src/main/java/com/imyeyu/spring/handler/GsonHandler.java

@@ -0,0 +1,57 @@
+package com.imyeyu.spring.handler;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParser;
+import com.imyeyu.java.TimiJava;
+import org.apache.ibatis.type.BaseTypeHandler;
+import org.apache.ibatis.type.JdbcType;
+
+import java.sql.CallableStatement;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+/**
+ * MySQL JSON 数据类型处理器
+ *
+ * @author 夜雨
+ * @since 2021-07-04 09:36
+ */
+public class GsonHandler extends BaseTypeHandler<JsonElement> {
+
+	@Override
+	public void setNonNullParameter(PreparedStatement ps, int i, JsonElement parameter, JdbcType jdbcType) throws SQLException {
+		ps.setString(i, parameter.toString());
+	}
+
+	@Override
+	public JsonElement getNullableResult(ResultSet rs, String columnName) throws SQLException {
+		return toElement(rs.getString(columnName));
+	}
+
+	@Override
+	public JsonElement getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
+		return toElement(rs.getString(columnIndex));
+	}
+
+	@Override
+	public JsonElement getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
+		return toElement(cs.getNString(columnIndex));
+	}
+
+	private JsonElement toElement(String json) {
+		if (TimiJava.isNotEmpty(json)) {
+			JsonElement el = JsonParser.parseString(json);
+			if (el.isJsonObject()) {
+				return el.getAsJsonObject();
+			}
+			if (el.isJsonArray()) {
+				return el.getAsJsonArray();
+			}
+			if (el.isJsonPrimitive()) {
+				return el.getAsJsonPrimitive();
+			}
+		}
+		return null;
+	}
+}