Question

我有一个名为SYSTEM_PARAMS的表，如下所示

+------------+------------------+------+-----+---------------------+-----------------------------+
| Field      | Type             | Null | Key | Default             | Extra                       |
+------------+------------------+------+-----+---------------------+-----------------------------+
| name       | varchar(50)      | NO   |     | NULL                |                             |
| value      | varchar(100)     | YES  |     | NULL                |                             |
| updated_at | timestamp        | NO   |     | CURRENT_TIMESTAMP   | on update CURRENT_TIMESTAMP |
| created_at | timestamp        | NO   |     | 0000-00-00 00:00:00 |                             |
| created_by | int(11)          | NO   |     | NULL                |                             |
| updated_by | int(11) unsigned | YES  |     | 0                   |                             |
+------------+------------------+------+-----+---------------------+-----------------------------+

其中我有必须运行的cron作业的所有名称，并使用当前正在运行的JobId更新特定作业名称的值，表格中没有定义primaryKey看到上面的模式，所以我在模型中定义了方法primaryKey()，如下所示

 public function primaryKey($asArray=FALSE) {
        return 'name';
    }

但这给了我一个错误，说我可以将静态方法定义为非静态方法，我在这里做错了什么。

PHP致命错误：无法制作静态方法 yii \ db \ ActiveRecord :: primaryKey（）类中的非静态常见\模型\ SystemParams

Answer 1

正是它所说的。

public static function primaryKey() { return ['name']; }是ActiveRecord类中的静态方法。

如果你想覆盖它，你也必须使它静止。

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;

public class JsonTable {
    JsonParser parser;

    public JsonTable( String filename ) {
        try {
            JsonFactory f = new JsonFactory();
            InputStream stream = Thread.currentThread().getContextClassLoader().getResourceAsStream( filename );
            parser = f.createParser(stream);
        } catch ( IOException e ) {
            e.printStackTrace();
        }
    }

    public String getTable() throws Exception {
        try {
            StringBuilder builder = new StringBuilder();
            List<String> header = new ArrayList<>();
            if ( parser.nextToken() != JsonToken.START_ARRAY ) {
                throw new RuntimeException( "Expected an array of objects." );
            }
            while ( parser.nextToken().equals(JsonToken.START_OBJECT) ) {
                buildRow(header,builder);
            }
            if ( parser.currentToken() != JsonToken.END_ARRAY ) {
                throw new RuntimeException( "Expected end of JSON array, got: " + parser.currentToken() );
            }
            wrapRowsWithTable(header,builder);
            return builder.toString();
        } finally {
            parser.close();
        }
    }

    private void wrapRowsWithTable( List<String> columns, StringBuilder builder ) {
        StringBuilder header = new StringBuilder();
        header.append("<table><thead><tr>");
        for( String column : columns ) {
            header.append("<th>" + column + "</th>");
        }
        header.append("</tr></thead>");
        builder.insert(0,header.toString());
        builder.append("</table>");
    }

    private void buildRow( List<String> header, StringBuilder builder ) throws IOException {
        int index = 0;
        builder.append("<tr>");
        while(parser.nextToken() != JsonToken.END_OBJECT)
        switch( parser.currentToken() ) {
        case FIELD_NAME:
            if( header.size() > index ) {
                if( !header.get(index).equals( parser.getCurrentName() ) ) {
                    throw new RuntimeException( "Expected field: " + header.get(index) + ", found: " + parser.getCurrentName() );
                }
            } else {
                header.add(parser.getCurrentName());
            }
            index++;
            break;
        case VALUE_NULL:
        case VALUE_TRUE:
        case VALUE_FALSE:
        case VALUE_NUMBER_INT:
        case VALUE_NUMBER_FLOAT:
        case VALUE_STRING:
            builder.append("<td>" + parser.getText() + "</td>");
            break;
        case VALUE_EMBEDDED_OBJECT:
            throw new RuntimeException( "Expecting an array of objects with no nested objects." );
        default:
            throw new RuntimeException( "Unexpected token: " + parser.currentToken() );
        }
    }
}

PS。它必须返回数组。请参阅this note。

yii2更新没有主键的表

1 个答案: