Java BinaryExpression.getLeftExpression方法代码示例

import net.sf.jsqlparser.expression.BinaryExpression; //导入方法依赖的package包/类
/**
 * 处理条件
 */
protected Expression builderExpression(Expression expression, Table table) {
    //生成字段名
    EqualsTo equalsTo = new EqualsTo();
    equalsTo.setLeftExpression(this.getAliasColumn(table));
    equalsTo.setRightExpression(tenantHandler.getTenantId());
    //加入判断防止条件为空时生成 "and null" 导致查询结果为空
    if (expression == null) {
        return equalsTo;
    } else {
        if (expression instanceof BinaryExpression) {
            BinaryExpression binaryExpression = (BinaryExpression) expression;
            if (binaryExpression.getLeftExpression() instanceof FromItem) {
                processFromItem((FromItem) binaryExpression.getLeftExpression());
            }
            if (binaryExpression.getRightExpression() instanceof FromItem) {
                processFromItem((FromItem) binaryExpression.getRightExpression());
            }
        }
        return new AndExpression(equalsTo, expression);
    }
}
 

import net.sf.jsqlparser.expression.BinaryExpression; //导入方法依赖的package包/类
private static Expression validateColumnConstaintToExpression(Expression testExpression, String columnName, String tableAlias, Class<? extends BinaryExpression> expressionType) throws StatementExecutionException {
    Expression result = null;
    if (expressionType.isAssignableFrom(testExpression.getClass())) {
        BinaryExpression e = (BinaryExpression) testExpression;
        if (e.getLeftExpression() instanceof net.sf.jsqlparser.schema.Column) {
            net.sf.jsqlparser.schema.Column c = (net.sf.jsqlparser.schema.Column) e.getLeftExpression();
            boolean okAlias = true;
            if (c.getTable() != null && c.getTable().getName() != null && !c.getTable().getName().equals(tableAlias)) {
                okAlias = false;
            }
            if (okAlias && columnName.equalsIgnoreCase(c.getColumnName())
                && SQLRecordPredicate.isConstant(e.getRightExpression())) {
                return e.getRightExpression();
            }
        } else if (e.getLeftExpression() instanceof AndExpression) {
            result = findConstraintOnColumn(e.getLeftExpression(), columnName, tableAlias, expressionType);
            if (result != null) {
                return result;
            }
        } else if (e.getRightExpression() instanceof AndExpression) {
            result = findConstraintOnColumn(e.getRightExpression(), columnName, tableAlias, expressionType);
            if (result != null) {
                return result;
            }
        }
    }
    return result;
}
 

import net.sf.jsqlparser.expression.BinaryExpression; //导入方法依赖的package包/类
private Expression validateColumnConstaintExpressionToExpression(Expression testExpression, String columnName, String tableAlias, Class<? extends BinaryExpression> expressionType) throws StatementExecutionException {
    Expression result = null;
    if (expressionType.isAssignableFrom(testExpression.getClass())) {
        BinaryExpression e = (BinaryExpression) testExpression;
        if (e.getLeftExpression() instanceof net.sf.jsqlparser.schema.Column) {
            net.sf.jsqlparser.schema.Column c = (net.sf.jsqlparser.schema.Column) e.getLeftExpression();
            boolean okAlias = true;
            if (c.getTable() != null && c.getTable().getName() != null && !c.getTable().getName().equals(tableAlias)) {
                okAlias = false;
            }
            if (okAlias && columnName.equalsIgnoreCase(c.getColumnName())
                && SQLRecordPredicate.isConstant(e.getRightExpression())) {
                return e;
            }
        } else if (e.getLeftExpression() instanceof AndExpression) {
            result = findConstraintExpressionOnColumn(e.getLeftExpression(), columnName, tableAlias, expressionType);
            if (result != null) {
                return result;
            }
        } else if (e.getRightExpression() instanceof AndExpression) {
            result = findConstraintExpressionOnColumn(e.getRightExpression(), columnName, tableAlias, expressionType);
            if (result != null) {
                return result;
            }
        }
    }
    return result;
}
 

import net.sf.jsqlparser.expression.BinaryExpression; //导入方法依赖的package包/类
private void visitBinaryExpression(BinaryExpression e) {
    if (e.getLeftExpression() instanceof JdbcParameter) {
        e.setLeftExpression(ImmutableExpressionsCache.internOrFixJdbcParameterExpression((JdbcParameter) e.getLeftExpression()));
    }
    if (e.getRightExpression() instanceof JdbcParameter) {
        e.setRightExpression(ImmutableExpressionsCache.internOrFixJdbcParameterExpression((JdbcParameter) e.getRightExpression()));
    }
    e.getLeftExpression().accept(this);
    e.getRightExpression().accept(this);
}
 

import net.sf.jsqlparser.expression.BinaryExpression; //导入方法依赖的package包/类
private static CompiledSQLExpression compileSpecialBinaryExpression(String validatedTableAlias, Expression exp) {
    BinaryExpression be = (BinaryExpression) exp;

    // MOST frequent expressions "TABLE.COLUMNNAME OPERATOR ?", we can hardcode the access to the column and to the JDBC parameter
    if (be.getLeftExpression() instanceof net.sf.jsqlparser.schema.Column) {
        net.sf.jsqlparser.schema.Column c = (net.sf.jsqlparser.schema.Column) be.getLeftExpression();
        if (validatedTableAlias != null) {
            if (c.getTable() != null && c.getTable().getName() != null
                && !c.getTable().getName().equals(validatedTableAlias)) {
                return null;
            }
        }

        String columnName = c.getColumnName();
        switch (columnName) {
            case BuiltinFunctions.BOOLEAN_TRUE:
                return null;
            case BuiltinFunctions.BOOLEAN_FALSE:
                return null;
            default:
                // OK !
                break;
        }

        if (be.getRightExpression() instanceof JdbcParameter) {
            JdbcParameter jdbcParam = (JdbcParameter) be.getRightExpression();
            int jdbcIndex = jdbcParam.getIndex() - 1;
            if (be instanceof EqualsTo) {
                return new ColumnEqualsJdbcParameter(be.isNot(), columnName, jdbcIndex);
            } else if (be instanceof NotEqualsTo) {
                return new ColumnNotEqualsJdbcParameter(be.isNot(), columnName, jdbcIndex);
            } else if (be instanceof GreaterThanEquals) {
                return new ColumnGreaterThanEqualsJdbcParameter(be.isNot(), columnName, jdbcIndex);
            } else if (be instanceof GreaterThan) {
                return new ColumnGreaterThanJdbcParameter(be.isNot(), columnName, jdbcIndex);
            } else if (be instanceof MinorThan) {
                return new ColumnMinorThanJdbcParameter(be.isNot(), columnName, jdbcIndex);
            } else if (be instanceof MinorThanEquals) {
                return new ColumnMinorThanEqualsJdbcParameter(be.isNot(), columnName, jdbcIndex);
            }
        } // TODO handle "TABLE.COLUMNNAME OPERATOR CONSTANT"
    }
    return null;
}
 

import net.sf.jsqlparser.expression.BinaryExpression; //导入方法依赖的package包/类
private void parseWhere(Expression where, int sequence) {
   log.debug("parse WHERE expression " + where);
   if (where == null) {
      log.info("No WHERE clause. Seems not to be a primary key condition");
   } else if (where instanceof AndExpression) {
      AndExpression and = (AndExpression) where;
      parseWhere(and.getLeftExpression(), sequence);
      parseWhere(and.getRightExpression(), sequence + 1);

   } else if (where instanceof BinaryExpression) {
      BinaryExpression exp = (BinaryExpression) where;
      if (!(exp.getLeftExpression() instanceof Column)) {
         if (log.isDebugEnabled()) {
            log.debug(exp.getLeftExpression().toString()
                  + exp.getStringExpression() + exp.getRightExpression()
                  + " is not a unique condition for the primary key column");
         }
         return;
      }

      List<SqlParameter> paramList = parameterMap.get(sql);
      if (paramList == null) {
         paramList = new ArrayList<SqlParameter>();
         parameterMap.put(sql, paramList);
      }

      findPrimaryKeyColumn();
      SqlExpressionParser expParser = new SqlExpressionParser();
      exp.getRightExpression().accept(expParser);
      Object value = expParser.getValue();
      String colName = ((Column) exp.getLeftExpression()).getColumnName();

      SqlParameter sqlParam = new SqlParameter(colName, value);
      if ("?".equals(value)) {
         sequence++;
         sqlParam.setSequence(sequence);
      }
      if (colName.equalsIgnoreCase(primaryKeyColumn)
            && exp instanceof EqualsTo) {
         primaryKeys.put(sql, sqlParam);
      }
      paramList.add(sqlParam);
      if (log.isDebugEnabled()) {
         log.debug("parse WHERE column " + sqlParam);
      }
   } else {
      log.info("WHERE clause does not contain a unique primary key condition.");
   }
}