panda.dao.sql.expert.Mssql2005SqlExpert Maven / Gradle / Ivy

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Panda Core is the core module of Panda Framework, it contains commonly used utility classes similar to apache-commons.
There is a newer version: 1.8.0
package panda.dao.sql.expert;

import java.sql.Types;
import java.util.ArrayList;
import java.util.List;

import panda.dao.DB;
import panda.dao.DaoTypes;
import panda.dao.entity.Entity;
import panda.dao.entity.EntityField;
import panda.dao.query.Query;
import panda.dao.sql.Sql;
import panda.io.Streams;
import panda.lang.Strings;

public class Mssql2005SqlExpert extends SqlExpert {
	@Override
	public DB getDatabaseType() {
		return DB.MSSQL;
	}

	@Override
	public String escape(String s) {
		return '[' + s + ']'; 
	}
	
	@Override
	public List create(Entity entity) {
		List sqls = new ArrayList();

		StringBuilder sb = new StringBuilder("CREATE TABLE " + escapeTable(client.getTableName(entity)) + " (");
		for (EntityField ef : entity.getFields()) {
			if (ef.isReadonly()) {
				continue;
			}

			sb.append(Streams.EOL);
			sb.append(escapeColumn(ef.getColumn())).append(' ').append(evalFieldType(ef));
			if (ef.isUnsigned()) {
				sb.append(" UNSIGNED");
			}
			if (ef.isNotNull()) {
				sb.append(" NOT NULL");
			}
			
			if (ef.isAutoIncrement()) {
				sb.append(" IDENTITY");
			}
			else if (ef.hasDefaultValue()) {
				sb.append(" DEFAULT '").append(ef.getDefaultValue()).append('\'');
			}
			sb.append(',');
		}
		
		// append primary keys
		addPrimaryKeys(sb, entity);
		sb.setCharAt(sb.length() - 1, ')');
		sqls.add(sb.toString());

		// add comments & constraints
		addComments(sqls, entity);
		addIndexes(sqls, entity);
		addForeignKeys(sqls, entity);
		return sqls;
	}

	@Override
	protected void addComments(List slqs, Entity entity) {
	}
	
	@Override
	protected String evalFieldType(EntityField ef) {
		if (Strings.isNotEmpty(ef.getNativeType())) {
			return super.evalFieldType(ef);
		}
		
		int jdbcType = DaoTypes.getType(ef.getJdbcType());
		switch (jdbcType) {
		case Types.BOOLEAN:
			return DaoTypes.BIT;
		case Types.DOUBLE:
			return DaoTypes.FLOAT;
		case Types.DATE:
		case Types.TIME:
		case Types.TIMESTAMP:
			return "DATETIME";
		case Types.VARCHAR:
			return "NVARCHAR(" + ef.getSize() + ")";
		case Types.LONGVARBINARY:
		case Types.BLOB:
			return "IMAGE";
		case Types.CLOB:
		case Types.LONGVARCHAR:
			return "NTEXT";
		default:
			break;
		}
		return super.evalFieldType(ef);
	}

	public String identityInsertOn(Entity entity) {
		return "SET IDENTITY_INSERT " + escapeTable(client.getTableName(entity)) + " ON";
	}
	
	public String identityInsertOff(Entity entity) {
		return "SET IDENTITY_INSERT " + escapeTable(client.getTableName(entity)) + " OFF";
	}
	
	/**
	 * @param sql sql
	 * @param query query
	 */
	@Override
	protected void limit(Sql sql, Query query, String alias) {
		// very rough, but works
		if (query.getStart() > 0) {
			if (query.hasOrders()) {
				long top = query.getLimit() > 0 ? query.getStart() + query.getLimit() : Long.MAX_VALUE;

				StringBuilder rn = new StringBuilder(); 
				rn.append(" TOP ").append(top);
				rn.append(" ROW_NUMBER() OVER(");
				order(rn, query, alias);
				rn.append(") __rn__,");
				
				sql.insert(6, rn);

				sql.insert(0, "SELECT * FROM (");
				sql.append(") _t1_ WHERE __rn__ > ").append(query.getStart());
			}
			else {
				StringBuilder beg = new StringBuilder(); 
				beg.append("SELECT * FROM (");
				beg.append("SELECT ROW_NUMBER() OVER(ORDER BY __tc__) __rn__, * FROM (");
				beg.append("SELECT");
				if (query.getLimit() > 0) {
					beg.append(" TOP ").append(query.getStart() + query.getLimit());
				}
				beg.append(" 0 __tc__, * FROM (");
	
				sql.insert(0, beg);
				sql.append(") _t1_ ) _t2_ ) _t3_ WHERE __rn__ > ").append(query.getStart());
			}
		}
		else if (query.getLimit() > 0) {
			sql.insert(6, " TOP " + query.getLimit());
		}
	}
}