FISCO BCOS Solidity 智能合约 return string[] This type is only supported in the new experimental ABI

最开始引入：

pragma experimental ABIEncoderV2;

pragma solidity ^0.4.25;
pragma experimental ABIEncoderV2;// import "./Table.sol";contract StudentScoreByCRUD{address private _owner;modifier onlyOwner{require(_owner == msg.sender, "Auth: only owner is authorized");_;}constructor () public {_owner = msg.sender;}event createEvent(address owner, string tableName);event insertEvent(address studentId, string courseName, int score);event updateEvent(address studentId, string courseName, int score);event removeEvent(address studentId, string courseName);// 创建成绩表function create() public onlyOwner returns(int){TableFactory tf = TableFactory(0x1001);int count = tf.createTable("stu_score", "student_id", "course_name, score");emit createEvent(msg.sender, "stu_score");return count;}// 插入成绩操作function insert(address studentId, string courseName, int score) public onlyOwner returns(int){TableFactory tf = TableFactory(0x1001);Table table = tf.openTable("stu_score");string memory stuIdStr = addressToString(studentId);Entry entry = table.newEntry();entry.set("student_id", stuIdStr);entry.set("course_name", courseName);entry.set("score", score);int count = table.insert(stuIdStr, entry);emit insertEvent(studentId, courseName, score);return count;}function addressToString(address addr) private pure returns(string) {// Convert addr to bytesbytes20 value = bytes20(uint160(addr));bytes memory strBytes = new bytes(42);// Encode hex prefixstrBytes[0] = '0';strBytes[1] = 'x';// Encode bytes usig hex encodingfor(uint i = 0; i < 20; i++){uint8 byteValue = uint8(value[i]);strBytes[2 + (i<<1)] = encode(byteValue >> 4);strBytes[3 + (i<<1)] = encode(byteValue & 0x0f);}return string(strBytes);}function encode(uint8 num) private pure returns(byte){// 0-9 -> 0-9if(num >= 0 && num <= 9){return byte(num + 48);}// 10-15 -> a-freturn byte(num + 87);}// 更新成绩操作function update(address studentId, string courseName, int newScore) public onlyOwner returns(int){TableFactory tf = TableFactory(0x1001);Table table = tf.openTable("stu_score");Entry entry = table.newEntry();entry.set("score", newScore);string memory stuIdStr = addressToString(studentId);Condition condition = table.newCondition();condition.EQ("student_id", stuIdStr);condition.EQ("course_name", courseName);int count = table.update(stuIdStr, entry, condition);emit updateEvent(studentId, courseName, newScore);return count;}// 删除成绩操作function remove(address studentId, string courseName) public onlyOwner returns(int){TableFactory tf = TableFactory(0x1001);Table table = tf.openTable("stu_score");string memory stuIdStr = addressToString(studentId);Condition condition = table.newCondition();condition.EQ("student_id", stuIdStr);condition.EQ("course_name", courseName);int count = table.remove(stuIdStr, condition);emit removeEvent(studentId, courseName);return count;}// 查询成绩操作function select(address studentId, string courseName) public view returns(int, string){TableFactory tf = TableFactory(0x1001);Table table = tf.openTable("stu_score");string memory stuIdStr = addressToString(studentId);Condition condition = table.newCondition();condition.EQ("student_id", stuIdStr);condition.EQ("course_name", courseName);Entries entries = table.select(stuIdStr, condition);if(entries.size() == 0){return (0, stuIdStr);}else{return (entries.get(0).getInt("score"), stuIdStr);}}// 查询某个学生的某课成绩所有成绩function select_all_scores(address studentId, string courseName) public view returns(int[]){TableFactory tf = TableFactory(0x1001);Table table = tf.openTable("stu_score");string memory stuIdStr = addressToString(studentId);Condition condition = table.newCondition();condition.EQ("student_id", stuIdStr);condition.EQ("course_name", courseName);Entries entries = table.select(stuIdStr, condition);// 初始化数组大小int[] memory user_scores_list = new int[](uint256(entries.size()));// 给数组赋值for(int i=0; i<entries.size(); ++i) {Entry entry = entries.get(i);// 添加数组元素user_scores_list[uint256(i)] = entry.getInt("score");}return user_scores_list;}// 查询某个学生的所有成绩function select_scores_info(address studentId) public view returns(string[], int[]){TableFactory tf = TableFactory(0x1001);Table table = tf.openTable("stu_score");string memory stuIdStr = addressToString(studentId);Condition condition = table.newCondition();condition.EQ("student_id", stuIdStr);Entries entries = table.select(stuIdStr, condition);// 初始化数组大小string[] memory user_courses_list = new string[](uint256(entries.size()));int[] memory user_scores_list = new int[](uint256(entries.size()));// 给数组赋值for(int i=0; i<entries.size(); ++i) {Entry entry = entries.get(i);// 添加数组元素user_courses_list[uint256(i)] = entry.getString("course_name");user_scores_list[uint256(i)] = entry.getInt("score");}return (user_courses_list, user_scores_list);}}// table.sol，因为在webase-front的IDE中无法直接引用，所以将源码放到代码文件中contract TableFactory {function openTable(string memory) public view returns (Table) {} //open tablefunction createTable(string memory, string memory, string memory) public returns (int256) {} //create table}//select conditioncontract Condition {function EQ(string memory, int256) public {}function EQ(string memory, string memory) public {}function NE(string memory, int256) public {}function NE(string memory, string memory) public {}function GT(string memory, int256) public {}function GE(string memory, int256) public {}function LT(string memory, int256) public {}function LE(string memory, int256) public {}function limit(int256) public {}function limit(int256, int256) public {}}//one recordcontract Entry {function getInt(string memory) public view returns (int256) {}function getUInt(string memory) public view returns (int256) {}function getAddress(string memory) public view returns (address) {}function getBytes64(string memory) public view returns (bytes1[64] memory) {}function getBytes32(string memory) public view returns (bytes32) {}function getString(string memory) public view returns (string memory) {}function set(string memory, int256) public {}function set(string memory, uint256) public {}function set(string memory, string memory) public {}function set(string memory, address) public {}}//record setscontract Entries {function get(int256) public view returns (Entry) {}function size() public view returns (int256) {}}//Table main contractcontract Table {function select(string memory, Condition) public view returns (Entries) {}function insert(string memory, Entry) public returns (int256) {}function update(string memory, Entry, Condition) public returns (int256) {}function remove(string memory, Condition) public returns (int256) {}function newEntry() public view returns (Entry) {}function newCondition() public view returns (Condition) {}}contract KVTableFactory {function openTable(string memory) public view returns (KVTable) {}function createTable(string memory, string memory, string memory) public returns (int256) {}}//KVTable per permiary key has only one Entrycontract KVTable {function get(string memory) public view returns (bool, Entry) {}function set(string memory, Entry) public returns (int256) {}function newEntry() public view returns (Entry) {}}

参考：https://ethereum.stackexchange.com/questions/69077/how-can-i-return-dynamic-string-array-in-solidity

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