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月初

使用示例​

import com.youngdatafan.sqlbuilder.enums.DatabaseType;
import com.youngdatafan.sqlbuilder.enums.FunctionType;
import com.youngdatafan.sqlbuilder.model.Function;
import com.youngdatafan.sqlbuilder.model.Model;
import com.youngdatafan.sqlbuilder.model.Query;
import com.youngdatafan.sqlbuilder.model.Schema;
import com.youngdatafan.sqlbuilder.model.Table;

public class Test {

    @org.junit.Test
    public void getFunction() {
        Schema schema = Schema.getSchema("");
        Table test = Table.getOriginalTable(schema, "test", "t");
     
        Model date = test.addField("date");
        Query query = new Query();
        Function function = Function.getFunction(FunctionType.MONTH_BEGIN, date);
        query.addColumn("val", function);
        query.addFrom(test);
        System.out.println("oracle：");
        System.out.println(query.getDatabaseSql(DatabaseType.ORACLE));
        System.out.println();
       
        System.out.println("pg：");
        System.out.println(query.getDatabaseSql(DatabaseType.POSTGRESQL));
        System.out.println();
       
        System.out.println("clickhouse：");
        System.out.println(query.getDatabaseSql(DatabaseType.CLICKHOUSE));
        System.out.println();
       
        System.out.println("mysql：");
        System.out.println(query.getDatabaseSql(DatabaseType.MYSQL));
        System.out.println();
       
        System.out.println("sqlserver：");
        System.out.println(query.getDatabaseSql(DatabaseType.MSSQL));
        System.out.println();
       
        System.out.println("kdw：");
        System.out.println(query.getDatabaseSql(DatabaseType.KDW));
        System.out.println();
    }
}

根据数据源获取对于数据库的sql。

ORACLE​

SELECT trunc(t."date", 'MM' ) AS "val" FROM "test" t

MYSQL​

SELECT DATE_ADD( LAST_DAY( date_sub(t.`date`, INTERVAL 1 MONTH )), INTERVAL 1 DAY ) AS `val` FROM `test` t

POSTGRESQL​

SELECT cast(date_trunc('month', t.date) as date) AS val FROM test t

CLICKHOUSE​

SELECT toStartOfMonth(t.date) AS val FROM test t

KDW​

SELECT cast(date_trunc('month', t.date) as date) AS val FROM test t

SQLSERVER​

SELECT CONVERT(date, CONVERT ( VARCHAR ( 8 ), t.date, 23 ) + '01' ) AS val FROM test t