MyBatis inserts and queries data in dynamic table names

1. Background

In some business scenarios, the table needs to be divided into tables (for example: divide the table by day, test_20220123, test_20220124).

After splitting the table, how to dynamically pass in the table name to the split table to insert and query data?

Two, the solution

1. Create entity

1）DbTable.java

Base class: There is only one field, tableName, which is used to pass in the name of the data table.

public class DbTable {
    
    
    private String tableName;

    public String getTableName() {
    
    
        return tableName;
    }

    public void setTableName(String tableName) {
    
    
        this.tableName = tableName;
    }
}

2) TestTable.java

Test class: contains id, name two fields.

public class TestTable extends DbTable {
    
    
    private Integer id;
    private String name;

    public Integer getId() {
    
    
        return id;
    }

    public void setId(Integer id) {
    
    
        this.id = id;
    }

    public String getName() {
    
    
        return name;
    }

    public void setName(String name) {
    
    
        this.name = name;
    }

    @Override
    public String toString() {
    
    
        return "TestTable{" +
                "tableName='" + super.getTableName() + '\'' +
                ", id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
}

2. Add & query data

1) Business logic

		String tableName = "test_20220124"; // 动态传入表名
        TestTable testTable = new TestTable();
        testTable.setTableName(tableName);
        testTable.setId(7);
        testTable.setName("d");
        final int insert = otherResourceMapper.insertDynamicTableName(testTable);
        System.out.println("insert: " + insert);
        List<TestTable> list = otherResourceMapper.testDynamicTableName(testTable);
        System.out.println("tableName: " + tableName + ", list size: " + list.size());

2) mapper.java file

    List<TestTable> testDynamicTableName(TestTable testTable);
    int insertDynamicTableName(TestTable testTable);

3) mapper.xml file

<select id="testDynamicTableName" parameterType="com.manage.model.TestTable" resultType="com.manage.model.TestTable">
        select * from ${
    
    tableName}
    </select>

    <insert id="insertDynamicTableName" parameterType="com.manage.model.TestTable">
        insert into ${
    
    tableName}(id, name)
        values (#{
    
    id}, #{
    
    name})
    </insert>

[ Note ] The tableName field here can only use ${} , not #{}